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  • 1.
    Arumugam, Ashokan
    et al.
    Department of Community Medicine and Rehabilitation – Physiotherapy Section, Umeå University, Umeå, Sweden.
    Strong, Andrew
    Department of Community Medicine and Rehabilitation – Physiotherapy Section, Umeå University, Umeå, Sweden.
    Tengman, Eva
    Department of Community Medicine and Rehabilitation – Physiotherapy Section, Umeå University, Umeå, Sweden.
    Röijezon, Ulrik
    Luleå tekniska universitet, Institutionen för hälsovetenskap, Hälsa och rehabilitering.
    Häger, Charlotte K
    Department of Community Medicine and Rehabilitation – Physiotherapy Section, Umeå University, Umeå, Sweden.
    Psychometric properties of knee proprioception tests targeting healthy individuals and those with anterior cruciate ligament injury managed with or without reconstruction: a systematic review protocol2019Ingår i: BMJ Open, E-ISSN 2044-6055, Vol. 9, nr 4, artikel-id e02741Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    An anterior cruciate ligament (ACL) injury affects knee proprioception and sensorimotor control and might contribute to an increased risk of a second ACL injury and secondary knee osteoarthritis. Therefore, there is a growing need for valid, reliable and responsive knee proprioception tests. No previous study has comprehensively reviewed all the relevant psychometric properties (PMPs) of these tests together. The aim of this review protocol is to narrate the steps involved in synthesising the evidence for the PMPs of specific knee proprioception tests among individuals with an ACL injury and knee-healthy controls.

  • 2. Björklund, Martin
    et al.
    Röijezon, Ulrik
    Häger-Ross, Charlotte
    Sandlund, Jonas
    Djupsjöbacka, Mats
    Bedömning och träning av sensomotoriska funktioner vid nackrehabilitering – varför och hur?2009Ingår i: Sjukgymnastdagarna 2009, 2009Konferensbidrag (Övrigt vetenskapligt)
  • 3.
    Blomgren, Johannes
    et al.
    Luleå tekniska universitet, Institutionen för hälsovetenskap, Hälsa och rehabilitering.
    Strandell, Erika
    Luleå tekniska universitet, Institutionen för hälsovetenskap, Hälsa och rehabilitering.
    Jull, Gwendolen
    Luleå tekniska universitet, Institutionen för hälsovetenskap, Hälsa och rehabilitering. Physiotherapy, School of Health and Rehabilitation Sciences, The University of Queensland, St Lucia, Brisbane, Australia.
    Vikman, Irene
    Luleå tekniska universitet, Institutionen för hälsovetenskap, Hälsa och rehabilitering.
    Röijezon, Ulrik
    Luleå tekniska universitet, Institutionen för hälsovetenskap, Hälsa och rehabilitering.
    Effects of deep cervical flexor training on impaired physiological functions associated with chronic neck pain: a systematic review2018Ingår i: BMC Musculoskeletal Disorders, E-ISSN 1471-2474, Vol. 19, artikel-id 415Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Background:Neck pain is a major health issue with high rates of recurrence. It presents with a variety ofaltered sensorimotor functions. Exercise is a cornerstone of rehabilitation and many training methods areused. Exercise is evaluated in most randomized controlled trials on its pain relieving effects. No review hasassessed the effect of exercise on the altered physiological functions or determined if there are differentialeffects of particular training methods. This review investigated the effects of deep cervical flexor (DCF)training, a training method commonly used for patients with neck pain, and compared it to other trainingmethodsornotrainingonoutcomesofcervicalneuromuscular function, muscle size, kinematics and kinetics.Methods:Web of Science, Scopus, CINAHL, PubMed were searched from inception until January 2018. Twelverandomized controlled trials were included that compared DCF training as sole intervention to other trainingor no interventions in persons with neck pain. The Cochrane Risk of Bias tool was used to assess the methodquality. All outcome measures were analysed descriptively and meta-analyses were performed for measuresevaluated in three or more studies.Results:DCF training was compared to cervical endurance, strength, proprioception and mobility training,muscle stretching, and no intervention control groups. Physiological outcome measures includedneuromuscular co-ordination (craniocervical flexion test), functional tasks, muscle fatigability, muscle size,kinematics (joint position sense, posture and range of motion) and kinetics (strength, endurance andcontraction accuracy). Strong evidence was found for effectiveness of DCF training on neuromuscularcoordination, but it had no or small effects on strength and endurance at higher loads. DCF trainingimproved head and cervical posture, while evidence was limited or contradictory for other measures.Conclusions:DCF training can successfully address impaired neuromuscular coordination, but not cervicalflexor strength and endurance at higher contraction intensities. A multimodal training regime is proposedwhen the aim is to specifically address various impaired physiological functions associated with neck pain

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  • 4.
    Clark, Nicholas C.
    et al.
    School of Sport, Health, and Applied Sciences. St Mary's University, London.
    Röijezon, Ulrik
    Luleå tekniska universitet, Institutionen för hälsovetenskap, Hälsa och rehabilitering.
    Treleaven, Julia
    CCRE Spine, Division of Physiotherapy, SHRS, University of Queensland, Brisbane.
    Proprioception in Musculoskeletal Rehabilitation: Part 2: Clinical Assessment and Intervention2015Ingår i: Manual Therapy, ISSN 1356-689X, E-ISSN 1532-2769, Vol. 20, nr 3, s. 378-387Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    IntroductionProprioception can be impaired in gradual-onset musculoskeletal pain disorders and following trauma. Understanding of the role of proprioception in sensorimotor dysfunction and methods for assessment and interventions is of vital importance in musculoskeletal rehabilitation. In Part 1 of this two-part Masterclass we presented a theory-based overview of the role of proprioception in sensorimotor control, causes and findings of altered proprioception in musculoskeletal conditions, and general principles of assessment and interventions.PurposeThe aim of this second part is to present specific methods for clinical assessment and interventions to improve proprioception in the spine and extremities.ImplicationsClinical assessment of proprioception can be performed using goniometers, inclinometers, laser-pointers, and pressure sensors. Manual therapy, taping, and bracing can immediately enhance proprioception and should be used to prepare for exercise interventions. Various types of exercise (active joint repositioning, force sense, co-ordination, muscle performance, balance/unstable surface, plyometric, and vibration training) should be employed for long-term enhancement of proprioception.

  • 5. Djupsjöbacka, Mats
    et al.
    Röijezon, Ulrik
    Häger-Ross, Charlotte
    Björklund, Martin
    Sensomotorisk funktion hos personer med nackbesvär2010Ingår i: Fysioterapi, ISSN 1653-5804, nr 6-7, s. 38-45Artikel i tidskrift (Övrigt vetenskapligt)
  • 6.
    Falk, Jimmy
    et al.
    Luleå tekniska universitet, Institutionen för hälsa, lärande och teknik, Hälsa, medicin och rehabilitering.
    Strandkvist, Viktor
    Luleå tekniska universitet, Institutionen för hälsa, lärande och teknik, Hälsa, medicin och rehabilitering.
    Pauelsen, Mascha
    Luleå tekniska universitet, Institutionen för hälsa, lärande och teknik, Hälsa, medicin och rehabilitering.
    Vikman, Irene
    Luleå tekniska universitet, Institutionen för hälsa, lärande och teknik, Hälsa, medicin och rehabilitering.
    Nyberg, Lars
    Luleå tekniska universitet, Institutionen för hälsa, lärande och teknik, Hälsa, medicin och rehabilitering.
    Röijezon, Ulrik
    Luleå tekniska universitet, Institutionen för hälsa, lärande och teknik, Hälsa, medicin och rehabilitering.
    Increased co-contraction reaction during a surface perturbation is associated with unsuccessful postural control among older adults2022Ingår i: BMC Geriatrics, ISSN 1471-2318, E-ISSN 1471-2318, Vol. 22, nr 1, artikel-id 438Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Background: As a strategy to maintain postural control, the stiffening strategy (agonist-antagonist co-contractions) is often considered dysfunctional and associated with poor physical capacity. The aim was to investigate whether increased stiffening is associated with unsuccessful postural control during an unpredictable surface perturbation, and which sensory and motor variables that explain postural stiffening.

    Methods: A sample of 34 older adults, 75.8 ± 3.8 years, was subjected to an unpredicted surface perturbation with the postural task to keep a feet-in-place strategy. The participants also completed a thorough sensory- and motor test protocol. During the surface perturbation, electromyography was measured from tibialis anterior and gastrocnemius to further calculate a co-contraction index during the feed-forward and feedback period. A binary logistic regression was done with the nominal variable, if the participant succeeded in the postural task or not, set as dependent variable and the co-contraction indexes set as independent variables. Further, the variables from the sensory and motor testing were set as independent variables in two separate Orthogonal Projections of Latent Structures (OPLS)-models, one with the feed-forward- and the other with the feedback co-contraction index as dependent variable.

    Results: Higher levels of ankle joint stiffening during the feedback, but not the feed-forward period was associated with postural task failure. Feedback stiffening was explained by having slow non-postural reaction times, poor leg muscle strength and being female whereas feed-forward stiffening was not explained by sensory and motor variables.

    Conclusions: When subjected to an unpredicted surface perturbation, individuals with higher feedback stiffening had poorer postural control outcome, which was explained by poorer physical capacity. The level of feed-forward stiffening prior the perturbation was not associated with postural control outcome nor the investigated sensory and motor variables. The intricate causal relationships between physical capacity, stiffening and postural task success remains subject for future research.

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  • 7.
    Falk, Jimmy
    et al.
    Luleå tekniska universitet, Institutionen för hälsa, lärande och teknik, Hälsa, medicin och rehabilitering.
    Strandkvist, Viktor
    Luleå tekniska universitet, Institutionen för hälsa, lärande och teknik, Hälsa, medicin och rehabilitering.
    Vikman, Irene
    Luleå tekniska universitet, Institutionen för hälsa, lärande och teknik, Hälsa, medicin och rehabilitering.
    Pauelsen, Mascha
    Luleå tekniska universitet, Institutionen för hälsa, lärande och teknik, Hälsa, medicin och rehabilitering.
    Röijezon, Ulrik
    Luleå tekniska universitet, Institutionen för hälsa, lärande och teknik, Hälsa, medicin och rehabilitering.
    What Explains Successful or Unsuccessful Postural Adaptations to Repeated Surface Perturbations among Older Adults?2021Ingår i: International Journal of Environmental Research and Public Health, ISSN 1661-7827, E-ISSN 1660-4601, Vol. 18, nr 22, artikel-id 12069Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    As we age there are natural physiological deteriorations that decrease the accuracy and flexibility of the postural control system, which increases the risk of falling. Studies have found that there are individual differences in the ability to learn to manage repeated postural threats. The aim of this study was to investigate which factors explain why some individuals are less proficient at adapting to recurrent postural perturbations. Thirty-five community dwelling older adults performed substantial sensory and motor testing and answered surveys regarding fall-related concerns and cognitive function. They were also subjected to three identical surface perturbations where both kinematics and electromyography was captured. Those that were able to adapt to the third perturbation were assigned to the group “Non-fallers” whereas those that fell during all perturbations were assigned to the group “Fallers”. The group designation dichotomized the sample in a hierarchical orthogonal projection of latent structures— the discriminant analysis model. We found that those who fell were older, had poorer physical performance, poorer strength and longer reaction times. The Fallers’ postural control strategies were more reliant on the stiffening strategy along with a more extended posture and they were less skillful at making appropriate feedforward adaptations prior to the third perturbation.

  • 8.
    Forsberg, Karin
    et al.
    Luleå tekniska universitet, Institutionen för hälsa, lärande och teknik, Hälsa, medicin och rehabilitering.
    Jirlén, Johan
    Luleå tekniska universitet, Institutionen för hälsa, lärande och teknik, Hälsa, medicin och rehabilitering.
    Jacobson, Inger
    Luleå tekniska universitet, Institutionen för hälsa, lärande och teknik, Hälsa, medicin och rehabilitering.
    Röijezon, Ulrik
    Luleå tekniska universitet, Institutionen för hälsa, lärande och teknik, Hälsa, medicin och rehabilitering.
    Concurrent Validity of Cervical Movement Tests Using VR Technology—Taking the Lab to the Clinic2023Ingår i: Sensors, E-ISSN 1424-8220, Vol. 23, nr 24, artikel-id 9864Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Reduced cervical range of motion (ROM) and movement velocity are often seen in people with neck pain. Objective assessment of movement characteristics is important to identify dysfunction, to inform tailored interventions, and for the evaluation of the treatment effect. The purpose of this study was to investigate the concurrent validity of a newly developed VR technology for the assessment of cervical ROM and movement velocity. VR technology was compared against a gold-standard three-dimensional optical motion capture system. Consequently, 20 people, 13 without and 7 with neck pain, participated in this quantitative cross-sectional study. ROM was assessed according to right/left rotation, flexion, extension, right/left lateral flexion, and four diagonal directions. Velocity was assessed according to fast cervical rotation to the right and left. The correlations between VR and the optical system for cervical ROM and velocity were excellent, with intraclass correlation coefficient (ICC) values > 0.95. The mean biases between VR and the optical system were ≤ 2.1° for the ROM variables, <12°/s for maximum velocity, and ≤3.0°/s for mean velocity. In conclusion, VR is a useful assessment device for ROM and velocity measurements with clinically acceptable biases. It is a feasible tool for the objective measurement of cervical kinematics in the clinic.

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  • 9.
    Jafari, Hedyeh
    et al.
    Luleå tekniska universitet, Institutionen för system- och rymdteknik, Signaler och system.
    Gustafsson, Thomas
    Luleå tekniska universitet, Institutionen för system- och rymdteknik, Signaler och system.
    Nyberg, Lars
    Luleå tekniska universitet, Institutionen för hälsa, lärande och teknik, Hälsa, medicin och rehabilitering.
    Röijezon, Ulrik
    Luleå tekniska universitet, Institutionen för hälsa, lärande och teknik, Hälsa, medicin och rehabilitering.
    Predicting balance impairments in older adults: a wavelet-based center of pressure classification approach2023Ingår i: Biomedical engineering online, E-ISSN 1475-925X, Vol. 22, artikel-id 83Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Background: Aging is associated with a decline in postural control and an increased risk of falls. The Center of Pressure (CoP) trajectory analysis is a commonly used method to assess balance. In this study, we proposed a new method to identify balance impairments in older adults by analyzing their CoP trajectory frequency components, sensory inputs, reaction time, motor functions, and Fall-related Concerns (FrC).

    Methods: The study includes 45 older adults aged 75.2(±4.5)75.2(±4.5) years who were assessed for sensory and motor functions. FrC and postural control in a quiet stance with open and closed eyes on stable and unstable surfaces. A Discrete Wavelet Transform (DWT) was used to detect features in frequency scales, followed by the K-means algorithm to detect different clusters. The multinomial logistic model was used to identify and predict the association of each group with the sensorimotor tests and FrC.

    Results: The study results showed that by DWT, three distinct groups of subjects could be revealed. Group 2 exhibited the broadest use of frequency scales, less decline in sensorimotor functions, and lowest FrC. The study also found that a decline in sensorimotor functions and fall-related concern may cause individuals to rely on either very low-frequency scales (group 1) or higher-frequency scales (group 3) and that those who use lower-frequency scales (group 1) can manage their balance more successfully than group 3.

    Conclusions: Our study provides a new, cost-effective method for detecting balance impairments in older adults. This method can be used to identify people at risk and develop interventions and rehabilitation strategies to prevent falls in this population.

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  • 10.
    Jafari, Hedyeh
    et al.
    Luleå tekniska universitet, Institutionen för system- och rymdteknik, Signaler och system.
    Pauelsen, Mascha
    Luleå tekniska universitet, Institutionen för hälsovetenskap, Hälsa och rehabilitering.
    Röijezon, Ulrik
    Luleå tekniska universitet, Institutionen för hälsovetenskap, Hälsa och rehabilitering.
    Nyberg, Lars
    Luleå tekniska universitet, Institutionen för hälsovetenskap, Hälsa och rehabilitering.
    Nikolakopoulos, George
    Luleå tekniska universitet, Institutionen för system- och rymdteknik, Signaler och system.
    Gustafsson, Thomas
    Luleå tekniska universitet, Institutionen för system- och rymdteknik, Signaler och system.
    A novel data driven model of ageing postural control2019Konferensbidrag (Refereegranskat)
    Abstract [en]

    Background

    Postural control is a complex system. Based on sensorimotor integration, the central nervous system (CNS) maintains balance by sending suitable motor commands to the muscles. Physiological decline due to ageing, affects balance performance through failing postural control – and in turn affects falls self-efficacy and activity participation. Understanding how the CNS adapts to these changes and predicts the appropriate motor commands to stabilize the body, has been a challenge for postural control research the latest years.

    Aims

    To understand and model the performance of the central nervous system as the controller of the human body.

    Methods

    Modelling was based on postural control data from 45 older adults (70 years and older). Ankle, knee and hip joint kinematics were measured during quiet stance using a motion capture system. Principal component analysis was used in order to reduce the measured multidimensional kinematics from a set of correlated discrete time series to a set of principal components. The outcome was utilized to predict the motor commands. The adaptive behaviour of the CNS was modelled by recurrent neural network including the efference copy for rapid predictions. The data from joint kinematics and electromyography (EMG) signals of the lower limb muscles were measured and separated into training and test data sets.

    Results

    The model can predict postural motor commands with very high accuracy regardless of a large physiological variability or balancing strategies. This model has three characteristics: a) presents an adaptive scheme to individual variability, 2) showcases the existence of an efference copy, and 3) is human experimental data driven.

    Conclusion

    The model can adapt to physical body characteristics and individual differences in balancing behaviour, while successfully predict motor commands. It should therefore be utilised in the continued pursuit of a better understanding of ageing postural control.

  • 11.
    Jafari, Hedyeh
    et al.
    Luleå tekniska universitet, Institutionen för system- och rymdteknik, Signaler och system.
    Pauelsen, Mascha
    Luleå tekniska universitet, Institutionen för hälsovetenskap, Hälsa, medicin och rehabilitering.
    Röijezon, Ulrik
    Luleå tekniska universitet, Institutionen för hälsovetenskap, Hälsa, medicin och rehabilitering.
    Nyberg, Lars
    Luleå tekniska universitet, Institutionen för hälsovetenskap, Hälsa, medicin och rehabilitering.
    Nikolakopoulos, George
    Luleå tekniska universitet, Institutionen för system- och rymdteknik, Signaler och system.
    Gustafsson, Thomas
    Luleå tekniska universitet, Institutionen för system- och rymdteknik, Signaler och system.
    On Internal Modeling of the Upright Postural Control in Elderly2018Ingår i: IEEE ROBIO 2018, IEEE, 2018, s. 231-236Konferensbidrag (Refereegranskat)
    Abstract [en]

    The second most common cause of injury in the elderly population is falling. In an effort to understand the mechanism behind the reduced ability to maintain balance in any posture or activity, we study the performance of the central nervous system as a controller of the body, while maintaining the balance in some postures or activities. Towards this direction, forty-five subjects aged over 70 were tested in different trials of quiet stance: a) hard stable surface with open eyes, b) stable surface with closed eyes, c) soft unstable surface with open eyes, and d) unstable surface, while eyes were closed. In the sequel, the body kinematics were described by legs and trunk segment angles in the sagittal plane, while the muscle activations were described by a weighted sum of rectified EMG signals from tibialis anterior and gastrocnemius muscles of left and right legs. Using the neuro-science hypothesis and adaptive control theory, a completely novel model was identified for the CNS based on the feedback internal model. The proposed model is able to predict the output commands, based on a recurrent neural network, while the efficiency of the proposed scheme has been proven based on multiple experimental results, showing that the model can sufficiently predict the muscle activity based on the optimum sensory inputs.

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  • 12.
    Johansson, Sara
    et al.
    Luleå tekniska universitet, Institutionen för hälsovetenskap.
    Rissén, Dag
    Centre for Research & Development, Uppsala University/Region of Gävleborg, Gävle, Sweden.
    Fjellman-Wiklund, Annchristine
    Department of Community Medicine and Rehabilitation, Physiotherapy, Umeå University.
    Paarup, Helene M.
    Research Unit for Occupational & Environmental Medicine, Clinical Institute, University of Southern Denmark.
    Röijezon, Ulrik
    Luleå tekniska universitet, Institutionen för hälsovetenskap, Hälsa och rehabilitering.
    Musculoskeletal pain, work posture and physical activity among professional symphony and opera musicians in Sweden2015Ingår i: Musician's Health and Performance. 2nd Conference (MHPC2015): Book of Abstracts, Odense, 2015, artikel-id 45Konferensbidrag (Refereegranskat)
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  • 13.
    Johansson Strandkvist, Viktor
    et al.
    Luleå tekniska universitet, Institutionen för hälsovetenskap, Hälsa och rehabilitering.
    Nyberg, Lars
    Luleå tekniska universitet, Institutionen för hälsovetenskap, Hälsa och rehabilitering.
    Larsson, Agneta
    Luleå tekniska universitet, Institutionen för hälsovetenskap, Hälsa och rehabilitering.
    Röijezon, Ulrik
    Luleå tekniska universitet, Institutionen för hälsovetenskap, Hälsa och rehabilitering.
    Stridsman, Caroline
    Luleå tekniska universitet, Institutionen för hälsovetenskap, Omvårdnad.
    Lindberg, Anne
    OLIN studierna Norrbottens läns landsting , Sverige.
    Project: Physical function and postural control among subjects with Chronic Obstructive Pulmonary Disease – epidemiological and laboratory studies2016Övrigt (Övrig (populärvetenskap, debatt, mm))
  • 14.
    Juul-Kristensen, Birgit
    et al.
    Institute of Sports Science and Clinical Biomechanics, University of Southern Denmark, Odense, Denmark; Institute of Occupational Therapy, Physiotherapy and Radiography, Bergen University College, Bergen, Norway.
    Röijezon, Ulrik
    Luleå tekniska universitet, Institutionen för hälsovetenskap, Hälsa och rehabilitering.
    Hypermobility among musicians - advantage or disadvantage?2013Ingår i: Musicians' Health and Performance 1st Nordic Conference 2013, Luleå: Luleå University of Technology, Department of Health Sciences , 2013, s. 18-19Konferensbidrag (Refereegranskat)
    Abstract [en]

    Generalised Joint Hypermobility (GJH) is a condition frequent seen in several hereditary diseases of connective disorders. It is defined from the maximal range of motion, often by the Beighton score, representing the laxity of the involved ligaments. GJH is a genetic feature, but also susceptible to training. GJH in adults is, when present with symptoms, characterised by functional limitations (1), decreased muscle strength, stability, proprioception, and an altered gait and muscle activity pattern.There are no precise prevalence rates of adults with Generalised Joint Hypermobility (GJH), but a recent review reports a varying prevalence for adults from 2-57% depending on age, gender and ethnic origin. For children the prevalence varies from 7-36%, primarily depending on the tests and criteria (especially the cut off-points) used for diagnosing GJH. GJH is more frequent in females/ girls than males/boys (2).Several studies found GJH to be frequent among performing artists, such as ballet dancers, gymnasts, and even musicians (3) and hypothesized an association between GJH and development of musculoskeletal disorders. As an example, professional dancers have higher physical fitness (walking distance, muscle strength, estimated VO2-max) than a matched control group, but for those with GJH, this advantage was not present.In a study of musicians a clear association was found between forearm and hand pain and GJH in 35% of female and 17% of male musicians (3), and also an increased prevalence of knee and spine symptoms in musicians with GJH (4). It has been suggested, that when playing music GJH is even an advantage, especially for joints that move quickly (wrists, elbows), but a disadvantage for joints that should stabilise (knees, back). However, one study did not find such association between symptoms and GJH in pianists.In summary, there seems to be some association between musculoskeletal injuries and GJH, presumably also in musicians, although the studies of this group are few. Therefore, larger epidemiological studies are necessary to confirm an association between GJH and musculoskeletal disorders in musicians, and whether specific precautions or preventive strategies should be taken for this group.References1. Juul-Kristensen B, Hansen H, Simonsen EB, Alkjaer T, Kristensen JH, Jensen BR, et al. Knee function in 10-year-old children and adults with Generalised Joint Hypermobility. The Knee. 2012;19:773-8.2. Remvig L, Jensen DV, Ward RC. Epidemiology of general joint hypermobility and basis for the proposed criteria for benign joint hypermobility syndrome: review of the literature. J Rheumatol. 2007;34(4):804-9.3. Brandfonbrener AG. Joint laxity and arm pain in a large clinical sample of musicians. Med Probl Perform Art. 2002;17(september):113-5.4. Larsson LG, Baum J, Mudholkar GS, Kollia GD. Benefits and disadvantages of joint hypermobility among musicians. NEnglJ Med. 1993;329(15):1079-82.

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  • 15.
    Karvelis, Petros
    et al.
    Laboratory of Knowledge and Intelligent Computing, Department of Computer Engineering, Technological Educational Institute of Epirus, Arta, Greece.
    Röijezon, Ulrik
    Luleå tekniska universitet, Institutionen för hälsovetenskap, Hälsa och rehabilitering.
    Faleij, Ragnar
    Luleå tekniska universitet, Institutionen för hälsovetenskap, Hälsa och rehabilitering.
    Georgoulas, George
    Luleå tekniska universitet, Institutionen för system- och rymdteknik, Signaler och system.
    Mansouri, Sina Sharif
    Luleå tekniska universitet, Institutionen för system- och rymdteknik, Signaler och system.
    Nikolakopoulos, George
    Luleå tekniska universitet, Institutionen för system- och rymdteknik, Signaler och system.
    A Laser Dot Tracking Method for the Assessment of Sensorimotor Function of the Hand2017Ingår i: 2017 25th Mediterranean Conference on Control and Automation, MED 2017, Piscataway. NJ: Institute of Electrical and Electronics Engineers (IEEE), 2017, s. 217-222, artikel-id 7984121Konferensbidrag (Refereegranskat)
    Abstract [en]

    Assessment of sensorimotor function is crucial during the rehabilitation process of various physical disorders, including impairments of the hand. While moment performance can be accurately assessed in movement science laboratories involving highly specialized personnel and facilities there is a lack of feasible objective methods for the general clinic. This paper describes a novel approach to sensorimotor assessment using an intuitive test and a specifically tailored image processing pipeline for the quantification of the test. More specifically the test relies on the patient being instructed on following a zig-zag pattern using a handled laser pointer. The movement of the pointer is tracked using image processing algorithm capable of automating the whole procedure. The method has potential for feasible objective clinical assessment of the hand and other body parts

  • 16.
    Larsson, Agneta
    et al.
    Luleå tekniska universitet, Institutionen för hälsovetenskap, Hälsa och rehabilitering.
    Röijezon, Ulrik
    Luleå tekniska universitet, Institutionen för hälsovetenskap, Hälsa och rehabilitering.
    Olsson, Ing-Mari
    Artist- och musikerhälsan i Malmö.
    Engquist, Karin
    Artist- och musikerhälsan i Malmö.
    Gard, Gunvor
    Luleå tekniska universitet, Institutionen för hälsovetenskap, Hälsa och rehabilitering.
    A web-based health promotion intervention for music students in Sweden2015Ingår i: Musician's Health and Performance. 2nd Conference (MHPC2015): Book of abstracts, 2015Konferensbidrag (Refereegranskat)
    Abstract [en]

    Aim: In this presentation a study protocol for a web-based health promotion intervention for music students, and the rationale behind it, will be described. The aim is to develop a new dynamic web-portal with an interactive multimodal health intervention program for musicians and music students, and perform a controlled feasibility and effect study among music students.Methods: A web-based competence development and coaching program for music students in Sweden will be developed and performed according to a cognitive approach with focus on the students own goals. The program will include knowledge concerning how to promote cognitive and emotional coping in performance situations; ergonomically sound playing postures; as well as how to prevent bodily symptoms, mental distress and hearing disorders. Participants will be music students from two regions in Sweden, Skåne and Norrbotten. The intervention group will have access to the web-based program together with web-based group coaching, while the control group will receive general web-based information. The intervention will continue for 6 month and outcome measures will be collected before, after intervention and after 12 months to evaluate the feasibility and health effects of the intervention. Expected outcomes: It is reasonable to believe that an increased awareness of healthy and balanced positions while playing, systematic use of pauses and variation during rehearsal, stress management skills and a sound attitude towards control of e.g. playing related fatigue and pain can improve the music students’ prerequisites for a healthy and sustainable working life. Discussion/Conclusion: This project will contribute with knowledge about feasibility and effects of e-health solutions specifically designed for music students and musicians. Feasible and efficient e-health solutions for musicians and other performing artists can have major impact for these professions in Sweden due to the large distances and the scarceness of specialized occupational health care providers within performing arts medicine.Acknowledgement: This research is supported by the Areas of excellence in research and innovation at Luleå university of technology - Innovative art and science, who have granted funding for project initiation.

  • 17.
    Linder, Martin
    et al.
    Ystad Rehab Center.
    Michaelson, Peter
    Luleå tekniska universitet, Institutionen för hälsovetenskap, Hälsa och rehabilitering.
    Röijezon, Ulrik
    Luleå tekniska universitet, Institutionen för hälsovetenskap, Hälsa och rehabilitering.
    Laterality judgments in people with low back pain-a cross-sectional observational and test-retest reliability study2016Ingår i: Manual Therapy, ISSN 1356-689X, E-ISSN 1532-2769, Vol. 21, s. 128-133Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    BackgroundDisruption of cortical representation, or body schema, has been indicated as a factor in the persistence and recurrence of LBP. This has been observed through impaired laterality judgment ability and it has been suggested that this ability is affected in a spatial rather than anatomical manner.ObjectivesWe compared laterality judgment performance of foot and trunk movements between people with LBP with or without leg pain and healthy controls, and investigated associations between test performance and pain. We also assessed the test-retest reliability of the Recognise OnlineTM software when used in a clinical and a home setting.DesignCross-sectional observational and test-retest study.MethodsThirty individuals with LBP and 30 healthy controls performed judgment tests of foot and trunk laterality once supervised in a clinic and twice at home.ResultsNo statistically significant group differences were found. LBP intensity was negatively related to trunk laterality accuracy (p=0.019). Intraclass correlation values ranged from 0.51-0.91. Reaction time improved significantly between test occasions while accuracy did not.ConclusionsLaterality judgments were not impaired in subjects with LBP compared to controls. Further research may clarify the relationship between pain mechanisms in LBP and laterality judgment ability. Reliability values were mostly acceptable, with wide and low confidence intervals, suggesting test retest reliability for Recognise OnlineTM could be questioned in this trial. A significant learning effect was observed which should be considered in clinical and research application of the test.

  • 18.
    Mamikoglu, Umut
    et al.
    Luleå tekniska universitet, Institutionen för system- och rymdteknik, Signaler och system.
    Andrikopoulos, Georgios
    Luleå tekniska universitet, Institutionen för system- och rymdteknik, Signaler och system.
    Nikolakopoulos, George
    Luleå tekniska universitet, Institutionen för system- och rymdteknik, Signaler och system.
    Röijezon, Ulrik
    Luleå tekniska universitet, Institutionen för hälsovetenskap, Hälsa och rehabilitering.
    Pauelsen, Mascha
    Luleå tekniska universitet, Institutionen för hälsovetenskap, Hälsa och rehabilitering.
    Gustafsson, Thomas
    Luleå tekniska universitet, Institutionen för system- och rymdteknik, Signaler och system.
    Electromyography Based Joint Angle Estimation and Control of a Robotic Leg2016Ingår i: 6th IEEE RAS and EMBS International Conference on Biomedical Robotics and Biomechatronics (BioRob 2016): June 26-29, Singapore, 2016, Piscataway, NJ: IEEE Communications Society, 2016, s. 182-187, artikel-id 7523619Konferensbidrag (Refereegranskat)
    Abstract [en]

    Musculoskeletal modeling based on Electromyography (EMG) has many applications in physiotherapy and biologically-inspired robotics. In this article, a novel methodology for the modeling of the dynamics of an antagonistic muscle pair that actuates the human ankle joint movements will be established. As it will be presented, the musculoskeletal model is based on a multi input single output (MISO) auto-regressive integrated moving average with exogenous input (ARIMAX) model, which takes the integrated EMG measurements as input and estimates the corresponding joint angles. Based on this methodology, a Pneumatic Artificial Muscle (PAM) robotic leg setup that mimics the flexion/extension movement of human ankle joint is controlled to replicate the human movement. The experimental results demonstrate the performance of EMG based joint angle estimation and control of the robotic leg with the proposed model.

  • 19.
    Mamikoglu, Umut
    et al.
    Luleå tekniska universitet, Institutionen för system- och rymdteknik, Signaler och system.
    Nikolakopoulos, George
    Luleå tekniska universitet, Institutionen för system- och rymdteknik, Signaler och system.
    Pauelsen, Mascha
    Luleå tekniska universitet, Institutionen för hälsovetenskap, Hälsa och rehabilitering.
    Varagnolo, Damiano
    Luleå tekniska universitet, Institutionen för system- och rymdteknik, Signaler och system.
    Röijezon, Ulrik
    Luleå tekniska universitet, Institutionen för hälsovetenskap, Hälsa och rehabilitering.
    Gustafsson, Thomas
    Luleå tekniska universitet, Institutionen för system- och rymdteknik, Signaler och system.
    Elbow Joint Angle Estimation by Using Integrated Surface Electromyography2016Ingår i: 24th Mediterranean Conference on Control and Automation (MED): June 21-24, Athens, Greece, 2016, Piscataway, NJ: IEEE Communications Society, 2016, s. 785-790, artikel-id 7535891Konferensbidrag (Refereegranskat)
    Abstract [en]

    Electromyography (EMG) signals represent the electrical activation of skeletal muscles and contain valuable information about muscular activity. Estimation of the joint movements by using surface EMG signals has great importance as a bio-inspired approach for the control of robotic limbs and prosthetics. However interpreting surface EMG measurements is challenging due to the nonlinearity and user dependency of the muscle dynamics. Hence it requires complex computational methods to map the EMG signals and corresponding limb motions. To solve this challenge we here propose to use an integrated EMG signal to identify the EMG-joint angle relation instead of using common EMG processing techniques. Then we estimate the joint angles for elbow flexion-extension movement by using an auto-regressive integrated moving average with exogenous input (ARIMAX) model, which takes integrated EMG measurements as input. The experiments showed that the suggested approach results in a 21.85% average increase in the estimation performance of the elbow joint angle compared to the standard EMG processing and identification.

  • 20.
    Nyberg, Lars
    et al.
    Luleå tekniska universitet, Institutionen för hälsovetenskap, Hälsa och rehabilitering.
    Pauelsen, Mascha
    Luleå tekniska universitet, Institutionen för hälsovetenskap, Hälsa och rehabilitering.
    Vikman, Irene
    Luleå tekniska universitet, Institutionen för hälsovetenskap, Hälsa och rehabilitering.
    Röijezon, Ulrik
    Luleå tekniska universitet, Institutionen för hälsovetenskap, Hälsa och rehabilitering.
    Johansson, Viktor
    Luleå tekniska universitet, Institutionen för hälsovetenskap, Hälsa och rehabilitering.
    Larsson, Agneta
    Luleå tekniska universitet, Institutionen för hälsovetenskap, Hälsa och rehabilitering.
    The relation between fall-related concerns and mobility in older age may be explained by underlying physical capacity and psychological factors2019Konferensbidrag (Refereegranskat)
    Abstract [en]

    Background:

    Mobility is one essential aspect of healthy and active ageing. Fall related concerns have shown very strong detrimental effects on activity levels among older people. Recent perspectives on these concerns suggest they may be seen as consequences of a lower appraisal of one´s own abilities, in turn deriving from perceived balance problems, fears and other psychological factors. The relation between fall-related concerns and mobility might therefore be explained by the interaction of such underlying factors, for instance physical performance.

    Aim:

    To attempt a multivariate exploration of underlying factors that might explain the relation between fall-related concerns and mobility

    Method:

    We visited 153 randomly selected citizens aged 70 or more in a North Swedish municipality. We used the Life Space Assessment (LSA) in order to describe participants’ individual patterns of mobility in various life spaces. By means of Orthogonal Projections to Latent Structures (O-PLS) we explored whether presumed association of LSA ratings to fall related concerns (FES-I), age, and sex could be mediated by physical performance and psychological factors.

    Results:

    As expected, we found that LSA scores (95% CI: 65-72) were strongly associated to age, sex, and FES-I scores in univariate analyses. However, the O-PLS analysis resulted in a model explaining 60% of the LSA variance, in which motricity-related physical performance (SPPB), dyspnoea (mMRC Dyspnoea Scale), morale (PGCM), and type of housing contributed significantly, while variables such as age, sex, FES-I, and also falls experience, did not. Fall consequence concerns bordered on significance.

    Conclusions:

    Physical capacities and psychological factors are important mediators of the previously observed associations of fall related concerns to mobility. This opens for new intervention opportunities to be considered. The significance of type of housing should be further researched.

  • 21.
    Nyberg, Lars
    et al.
    Luleå tekniska universitet, Institutionen för hälsa, lärande och teknik, Hälsa, medicin och rehabilitering.
    Röijezon, Ulrik
    Luleå tekniska universitet, Institutionen för hälsa, lärande och teknik, Hälsa, medicin och rehabilitering.
    Larsson, Agneta
    Luleå tekniska universitet, Institutionen för hälsa, lärande och teknik, Hälsa, medicin och rehabilitering.
    Jäger, Jenny
    Luleå tekniska universitet, Institutionen för hälsa, lärande och teknik, Hälsa, medicin och rehabilitering.
    Pauelsen, Mascha
    Luleå tekniska universitet, Institutionen för hälsa, lärande och teknik, Hälsa, medicin och rehabilitering.
    Vikman, Irene
    Luleå tekniska universitet, Institutionen för hälsa, lärande och teknik, Hälsa, medicin och rehabilitering.
    Falk, Jimmy
    Luleå tekniska universitet, Institutionen för hälsa, lärande och teknik, Hälsa, medicin och rehabilitering.
    Strandkvist, Viktor
    Luleå tekniska universitet, Institutionen för hälsa, lärande och teknik, Hälsa, medicin och rehabilitering.
    Teknik ska minska fallolyckor bland äldre2023Ingår i: Äldre i Centrum, nr 1Artikel i tidskrift (Övrig (populärvetenskap, debatt, mm))
    Ladda ner fulltext (pdf)
    fulltext
  • 22.
    Pauelsen, Mascha
    et al.
    Luleå tekniska universitet, Institutionen för hälsovetenskap, Hälsa, medicin och rehabilitering.
    Jafari, Hedyeh
    Luleå tekniska universitet, Institutionen för system- och rymdteknik, Signaler och system.
    Strandkvist, Viktor
    Luleå tekniska universitet, Institutionen för hälsovetenskap, Hälsa, medicin och rehabilitering.
    Nyberg, Lars
    Luleå tekniska universitet, Institutionen för hälsovetenskap, Hälsa, medicin och rehabilitering.
    Gustafsson, Thomas
    Luleå tekniska universitet, Institutionen för system- och rymdteknik, Signaler och system.
    Vikman, Irene
    Luleå tekniska universitet, Institutionen för hälsovetenskap, Hälsa, medicin och rehabilitering.
    Röijezon, Ulrik
    Luleå tekniska universitet, Institutionen för hälsovetenskap, Hälsa, medicin och rehabilitering.
    Frequency domain shows: Fall-related concerns and sensorimotor decline explain inability to adjust postural control strategy in older adults2020Ingår i: PLOS ONE, E-ISSN 1932-6203, Vol. 15, nr 11, artikel-id e0242608Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Human postural control is a complex system and changes as we age. Frequency based analyses have been argued to be useful to identify altered postural control strategies in balance tasks. The aim of this study was to explore the frequency domain of the quiet stance centre of pressure of older adults with various degrees of fall-related concerns and sensorimotor functioning. We included 45 community dwelling older adults and used a force plate to register 30 seconds of quiet stance with eyes open and closed respectively. We also measured sensory and motor functions, as well as fall-related concerns and morale. We analysed the centre of pressure power spectrum density and extracted the frequency of 4 of its features for each participant. Orthogonal projection of latent structures–discriminant analysis revealed two groups for each quiet stance trial. Group 1 of each trial showed less sensory and motor decline, low/no fall-related concerns and higher frequencies. Group 2 showed more decline, higher fall-related concerns and lower frequencies. During the closed eyes trial, group 1 and group 2 shifted their features to higher frequencies, but only group 1 did so in any significant way. Higher fall-related concerns, sensory and motor decline, and explorative balancing strategies are highly correlated. The control system of individuals experiencing this seems to be highly dependent on vision. Higher fall-related concerns, and sensory and motor decline are also correlated with the inability to adjust to faster, more reactive balancing strategies, when vision is not available.

  • 23.
    Pauelsen, Mascha
    et al.
    Luleå tekniska universitet, Institutionen för hälsovetenskap, Hälsa och rehabilitering.
    Jafari, Hedyeh
    Luleå tekniska universitet, Institutionen för system- och rymdteknik, Signaler och system.
    Vikman, Irene
    Luleå tekniska universitet, Institutionen för hälsovetenskap, Hälsa och rehabilitering.
    Nyberg, Lars
    Luleå tekniska universitet, Institutionen för hälsovetenskap, Hälsa och rehabilitering.
    Röijezon, Ulrik
    Luleå tekniska universitet, Institutionen för hälsovetenskap, Hälsa och rehabilitering.
    Using the frequency power spectrum to learn more about aging postural control and fall-related concerns2019Konferensbidrag (Refereegranskat)
    Abstract [en]

    Backgound:

    Posturography is widely used to describe and analyze human postural control. The traditional features of the center of pressure (CoP) trajectory during open eyes quiet standing tests have been used to show the association between declined sensorimotor systems and the variation in fall-related concerns (FrC), but seem to be too crude to separate each sensorimotor system’s contribution. Therefore, research has moved towards analysing the frequency domain of the CoP trajectory.

    Aim:

    To explore the frequency domain of CoP trajectory signals in an effort to learn more about ageing postural control and how it mediates and is mediated by FrC 

    Method:

    We recruited 45 people aged 70 or more. To measure body sway during quiet stance, we registered CoP trajectories using a force plate. A power spectral density analysis was performed on the CoP signal of all participants, from which we then extracted features: peak power, mean power, 50% power and 80% power. Principal component analysis, orthogonal projection to latent structures (OPLS), and OPLS-discriminant analysis were used to explore patterns of explanation of the features by a wide range of sensorimotor variables and FrC measured on the participants. A PLS-tree was used for the initial grouping.

    Results:

    The PLS-tree gave 2 groups. Group 2 had significantly more FrC, lower morale, larger errors in knee proprioception, slower reaction times, and weaker lower limb strength. They also had lower frequencies at all four features (significant at all but peak power).

    Conclusions:

    Under the assumption that the vision feedback loop generates more power in the lower frequencies of quiet stance sway, one explanation of the findings could be that once an individual starts experiencing postural control decline, vision gets weighed heavier in the integration process. More research is needed to find the most accurate ways to investigate postural control changes.

  • 24.
    Pauelsen, Mascha
    et al.
    Luleå tekniska universitet, Institutionen för hälsovetenskap, Hälsa och rehabilitering.
    Nyberg, Lars
    Luleå tekniska universitet, Institutionen för hälsovetenskap, Hälsa och rehabilitering.
    Röijezon, Ulrik
    Luleå tekniska universitet, Institutionen för hälsovetenskap, Hälsa och rehabilitering.
    Vikman, Irene
    Luleå tekniska universitet, Institutionen för hälsovetenskap, Hälsa och rehabilitering.
    Both psychological factors and physical performance are associated with fall-related concerns2018Ingår i: Aging Clinical and Experimental Research, ISSN 1594-0667, E-ISSN 1720-8319, Vol. 30, nr 9, s. 1079-1085Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Background Fall-related concern strongly correlates to activity avoidance in older people.  In this complex phenomenon, different terminology and instruments are often used interchangeably. Three main concepts make up fall-related concerns: fear-of-falling, consequence concern, and falls self-efficacy. It is suggested that fall-related concerns are mediated by psychological and physical factors.

    Aims Our aims were to describe the prevalence of fall-related concerns and find explanatory factors for its most studied concept – falls self-efficacy – in an older population.

    Methods We executed a cross sectional study on a random sample of 153 community dwelling older people (70 years or older). We used validated and reliable instruments as well as structured interviews to gather data on the three concepts of fall-related concerns and possible mediating factors. We then calculated descriptive statistics on prevalence and regression models for the total group, and men and women separately.

    Results 70% of the total sample (80% of women and 53% of men) reported at least one of the three concepts of fall-related concern. For the total sample, fear-of-falling, morale and physical performance were associated factors with falls self-efficacy. For women, number of prescription medications was added. For men, physical performance and concerns for injury were associated.

    Conclusion Fall-related concern is prevalent in large proportions with higher prevalence for women than for men. Important factors are fear of falling, morale, and physical performance. Gender differences in the emergence and variance of fall-related concern and the relation between physical performance and fall-related concern should be targeted in future research endeavors. 

  • 25. Pauelsen, Mascha
    et al.
    Nyberg, Lars
    Luleå tekniska universitet, Institutionen för hälsovetenskap, Hälsa och rehabilitering.
    Röijezon, Ulrik
    Luleå tekniska universitet, Institutionen för hälsovetenskap, Hälsa och rehabilitering.
    Vikman, Irene
    Luleå tekniska universitet, Institutionen för hälsovetenskap, Hälsa och rehabilitering.
    Fear, morale, and physical performance, not past falls, mediate fallsefficacy in community dwelling older people2017Ingår i: WCPT 2017 congress proceedings, 2017Konferensbidrag (Refereegranskat)
    Abstract [en]

    Background: Fallrelatedconcerns have a large impact on wellbeing,balance performance and future falls. Theprimary focus in fallrelatedconcern research has generally been related to physical factors andprevious falls. This is mirrored by the use of the traditional fear avoidance model for falls in clinicalsettings, in which actual falls play a pivotal part in creating and perpetuating the cycle of fear activityavoidance fallsfear.Many researchers and clinicians, however, have started toacknowledge that more factors play a part in this complex issue.

    Purpose: We aimed at investigating fallsefficacyin relation to several psychological, demographic andphysical factors in an effort to discover a more fitting model for explaining fallrelatedconcern.

    Methods: We have visited a random population sample of 115 people, aged 70 or more and living in amunicipality in Northern Sweden. The participants were assessed for falls efficacy by means of theFalls Efficacy Scale International(FESI).We also collected data on selected potential covariatessuch as fear of falling, fall consequence concerns, falls history, physical performance, activity,cognitive performance, morale, medication and selected demographics. We then used multipleregression analyses in order to model covariate associations to prevalence and degree of fallrelatedconcern.

    Results: The analyses show the following: The sample presents a median FESIscore of 21, and 36 % (CI.95limits: 27 %; 44 %) score 22 or higher, indicating poor fallrelatedefficacy. Further, 39% (CI.95 limits:30 %; 48 %) express some degree of fear of falling while 54 % (CI.95 limits: 45 %; 63 %) areconcerned about sustaining injuries from a fall (consequence concern). The correlation betweenfear of falling and falls efficacy seems weak (r = .55), indicating related but separate phenomena.Moreover, data indicate no significant associations between previous falls and falls efficacy, fear offalling, or consequence concern. On the other hand, FESIscores seem to be explained to a degreeof 48 % by the three variables physical performance, fear of falling, and morale (as measured by thePhiladelphia Geriatric Centre Morale scale).

    Conclusion(s): These findings may contribute to a better understanding of fallrelatedconcerns. Perhaps fear,morale, and physical ability are stronger mediators than actual falls experience in itself. If so, thiswould call for the development of a new model which more adequately describes how fallrelatedconcerns are mediated while excluding falls as a cause.

    Implications: The clinical implications of this model would mean a shift to include more psychosocial aspects toreduce fallrelatedconcern and risk of falling. An approach directed more towards morale, as well asincreasing efficacy and improving physical performance.

  • 26.
    Pauelsen, Mascha
    et al.
    Luleå tekniska universitet, Institutionen för hälsovetenskap, Hälsa och rehabilitering.
    Vikman, Irene
    Luleå tekniska universitet, Institutionen för hälsovetenskap, Hälsa och rehabilitering.
    Johansson, Viktor
    Luleå tekniska universitet, Institutionen för hälsovetenskap, Hälsa och rehabilitering.
    Larsson, Agneta
    Luleå tekniska universitet, Institutionen för hälsovetenskap, Hälsa och rehabilitering.
    Röijezon, Ulrik
    Luleå tekniska universitet, Institutionen för hälsovetenskap, Hälsa och rehabilitering.
    Decline in sensorimotor systems explains reduced falls self-efficacy2018Ingår i: Journal of Electromyography & Kinesiology, ISSN 1050-6411, E-ISSN 1873-5711, Vol. 42, s. 104-110Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Physical performance including balance tasks is one of the main factors explaining the variance in falls self-efficacy in older adults. Balance performance is often measured by use of gross assessment scales, which assess the result of integration of all systems involved in postural control. We aimed to investigate which measurements of postural control correlate to falls self-efficacy scores as measured by the FES-I instrument, and which sensory and motor systems best explain them. A cross sectional study was designed, in which 45 older adults performed quiet stance and limits of stability trials during which their center of pressure (CoP) excursion was recorded. Falls self-efficacy was measured using the Falls Efficacy Scale - International. Eyesight, vestibular function, proprioception, reaction time and strength were also measured. Hierarchical orthogonal projection of latent structures was used to model FES-I with the CoP trials and then with the sensory and muscle function data. Fes-I could be explained to 39%, with the eyes open trials and the limits of stability trials loading the heaviest. The base model could be explained to 40% using the sensory and muscle function data, with lower limb strength, leg proprioception, neck proprioception, reaction time and eyesight loading the heaviest.

    Ladda ner fulltext (pdf)
    fulltext
  • 27. Richter, H.O.
    et al.
    Röijezon, Ulrik
    Björklund, Martin
    Djupsjöbacka, Mats
    Long-term adaptation to neck/shoulder pain and perceptual performance in a hand laterality motor imagery test2010Ingår i: Perception, ISSN 0301-0066, E-ISSN 1468-4233, Vol. 39, nr 1, s. 119-130Artikel i tidskrift (Refereegranskat)
  • 28. Rissen, Dag
    et al.
    Fjellman Wiklund, Anncristin
    Liv, Per
    Röijezon, Ulrik
    Luleå tekniska universitet, Institutionen för hälsa, lärande och teknik, Hälsa, medicin och rehabilitering.
    Psychosocial work environment, stress symptoms and musculoskeletal pain among professional Swedish big band musicians2022Konferensbidrag (Refereegranskat)
    Abstract [en]

    Background: The psychosocial work environment among musicians can be demanding due to factors such as high job demands, low control, and lack of social support. At the same time, musical performance is physically demanding, and musculoskeletal pain is common. However, few studies have investigated health situation among jazz musicians. 

    Research questions: How do Swedish big band musicians perceive the psychosocial work environment? What are the levels of stress symptoms? Are there any differences in these variables between those with or without playing related musculoskeletal pain? 

    Methods: Three professional big bands in Sweden participated in this cross-sectional questionnaire study. Thirty-two of 35 musicians (mean age 45.4years (SD 10.1); 30 male) participated. A questionnaire including the Nordic Musculoskeletal Questionnaire, additional questions about playing related musculoskeletal pain (PRMD), Demand-Control-Support Questionnaire, and The Copenhagen-Psychosocial-Questionnaire, was used. Mann-Whitney U test was used to compare musicians with or without PRMD. P-value was set at <.05. 

    Results: Level of demands at work (median: 11.5, IQR: 2) was lower than control (median: 18.0, IQR:3). Job strain (i.e. demands/control) had a median value of 0.65 (IQR: 0.14). Level of social support was 19.5 (IQR: 4). Emotional- (median: 7.0, IQR 2), cognitive- (median: 6.0, IQR: 3) and somatic- (median: 6.0, IQR: 3) stress symptoms were approximately at the same levels. Eight of 32 musicians had PRMD during the last 7 days. The groups did not differ significantly in any of the studied variables. 

    Summary of content: The psychosocial work environment of these jazz musicians seems to be favorable since the perceived control is higher than the demands. Compared with professional symphony orchestra musicians, the stress symptoms are similar to (1), who used percent scores. No significant differences were foundation between musicians with or without PRMD. 

    Significance: The psychosocial work environment may differ between different groups of musicians. More research is warranted to explore these potential differences, with a special focus on groups less investigated.  

  • 29.
    Rissén, Dag
    et al.
    Centre for Research & Development, Uppsala University/Region of Gävleborg, Gävle, Sweden.
    Fjellman-Wiklund, Annchristine
    Department of Community Medicine and Rehabilitation, Physiotherapy, Umeå University.
    Röijezon, Ulrik
    Luleå tekniska universitet, Institutionen för hälsovetenskap, Hälsa och rehabilitering.
    Prevalence, intensity, and playing related consequences of musculoskeletal pain, and associations with mood among professional orchestra musicians – a pilot study2015Ingår i: Musician's Health and Performance. 2nd Conference (MHPC2015): Book of Abstracts, Odense, 2015, artikel-id 12Konferensbidrag (Refereegranskat)
    Abstract [en]

    Prevalence, intensity, and playing related consequences of musculoskeletal pain, and associations with mood among professional orchestra musicians – a pilot study

    Ladda ner fulltext (pdf)
    FULLTEXT01
  • 30.
    Röijezon, Ulrik
    Luleå tekniska universitet, Institutionen för hälsovetenskap, Hälsa och rehabilitering.
    Aktivitet: Human Health and Performance Lab: Movement Science2012Övrigt (Övrig (populärvetenskap, debatt, mm))
    Abstract [sv]

    Ansvarig för uppbyggnad, utveckling och labverksamhet vid rörelselabbet vid Institutionen för Hälsovetenskap vid LTU, Luleå.

  • 31.
    Röijezon, Ulrik
    Luleå tekniska universitet, Institutionen för hälsovetenskap, Hälsa och rehabilitering.
    Aktivitet: Kulturell inspiration: Musik, film, noveller, poesi1970Övrigt (Övrig (populärvetenskap, debatt, mm))
    Abstract [en]

    Musik: Steely Dan, Movits, Bo Kaspers, Stones, Dylan, Thievery Coorporation, Bugge Wesseltoft... Film: Quentin Tarantino: Pulp fiction, Django unchanged, Dansk film & tv, etc... Noveller: Paulo Coelho, Franz Kafka, William S Bouroghs... Poesi: Bruno K Öijer, Karin Boije...

  • 32.
    Röijezon, Ulrik
    Luleå tekniska universitet, Institutionen för hälsovetenskap, Hälsa och rehabilitering.
    Aktivitet: Musicians' Health & Performance2015Övrigt (Övrig (populärvetenskap, debatt, mm))
  • 33.
    Röijezon, Ulrik
    Luleå tekniska universitet, Institutionen för hälsovetenskap, Hälsa och rehabilitering.
    Aktivitet: Musicians´Health & Performance2013Övrigt (Övrig (populärvetenskap, debatt, mm))
    Ladda ner fulltext (pdf)
    FULLTEXT01
  • 34.
    Röijezon, Ulrik
    Luleå tekniska universitet, Institutionen för hälsovetenskap, Hälsa och rehabilitering.
    Assessment and exercise of sensorimotor function in neck pain disorders2011Ingår i: Journal of Rehabilitation Medicine, ISSN 1650-1977, E-ISSN 1651-2081, Vol. 43, nr Suppl 50Artikel i tidskrift (Övrigt vetenskapligt)
    Abstract [en]

    Recent research on sensorimotor function has contributed essentially to the understanding of possible pathophysiological mechanisms, associations between pain and altered motor control and to the development of assessment and rehabilitation methods of musculoskeletal pain disorders. The sensory and motor functions of the cervical spine are fundamental for the stability and movement control of the head, for the arm and hand function, as well as for the postural control. Thus, sensorimotor deficiencies in neck pain disorders may have important impact not only regarding symptoms but also on physical functioning in daily living and work life. Pathophysiological models explaining the associations between pain and altered sensorimotor function include, e.g., disturbed proprioceptive information due to altered sensitivity of muscle spindle afferents, and altered muscle activation patterns due to pain adaptations. According to these models, sensorimotor deficiencies may be of immense importance for the recurrence, persistence and spread of musculoskeletal pain disorders. Assessments of sensorimotor function in neck pain disorders have revealed deficiencies including, e.g., reduced range of motion and movement speed of cervical movements; reduced acuity in movements of the neck, shoulder and elbow; and reduced muscle strength, as well as altered activation synergies of the deep and superficial cervical muscles. Disturbances have also been identified for occulomotor function and postural control, especially in neck pain related to trauma and cervicogenic dizziness. For references see, e.g. (1). In line with the above, specific exercise regimes designed to improve sensorimotor function, such as neck coordination and proprioception exercises, have shown promising results in reducing pain and improving motor functions, e.g., (2). A common characteristic of these exercises is that they involve slow movements and closed skills tasks (i.e., the task is highly predictable). According to the literature on motor learning, exercises involving more open skills tasks can be useful for training sensorimotor function. Therefore, new methods have been developed which involve less predictable exercises and thereby increase the demand for on-line adjustments of the neuromuscular control system (3, 4). Taken together, these theoretical and empirical premises support the value of assessment and exercise of sensorimotor function in the rehabilitation of neck pain disorders. Further research is, however, warranted, e.g., regarding the neuromuscular mechanisms involved in various types of exercises; the predictive ability of the efficiency of interventions for a specific individual; and RCT-studies including long-term follow-up. References1. Röijezon U. Sensorimotor function in chronic neck pain: Objective assessmentsand a novel method for neck coordination exercise [PhD-thesis]:Umeå University, ISSN 0346-6612; ISBN: 978-91-7264-809-8; 2009.2. Jull G, Falla D, Treleaven J, Hodges P, Vicenzino B. Retraining cervicaljoint position sense: The effect of two exercise regimes. J Orthop Res2007 Mar; 25: 404–412.3. Kristjansson E, Oddsdottir GL. “The Fly”: A new clinical assessment andtreatment method for deficits of movement control in the cervical spinereliability and validity. Spine 2010; 35: E1298–E305.4. Röijezon U, Björklund M, Bergenheim M, Djupsjöbacka M. A novelmethod for neck coordination exercise--a pilot study on persons withchronic non-specific neck pain. J Neuroeng Rehabil 2008; 5: 36.

  • 35.
    Röijezon, Ulrik
    Luleå tekniska universitet, Institutionen för hälsovetenskap, Hälsa och rehabilitering.
    Motorisk inlärning2019Ingår i: Motorisk kontroll och inlärning: Med inriktning på muskuloskeletal rehabilitering / [ed] Ulrik Röijezon, Lund: Studentlitteratur AB, 2019, 1, s. 127-139Kapitel i bok, del av antologi (Övrigt vetenskapligt)
    Abstract [sv]

    Träning av motorisk kontroll vid rehabilitering av smärttillstånd inkluderar bland annat övningar för proprioception, neuromuskulär koordination, stabilitet, balans, hållning och koordinerade rörelsemönster. Målet med träningen är att förmågan att utföra färdigheten ska kvarstå över tid och omsättas i praktiken vid olika aktiviteter i patientens vardagliga liv, till exempel vid lyft, datorarbete, musicerande eller idrottande. Träning av motorisk kontroll involverar med andra ord inlärning av motoriska färdigheter. För att träningen ska bli så effektiv som möjligt är det en god idé att ta del av kunskap som presenterats inom forskningsområdet för motorisk inlärning. I detta kapitel presenteras metoder och teorier kring motorisk inlärning med tillämpning vid prevention och rehabilitering av muskuloskeletala besvär. De är applicerbara på alla typer av inlärning av nya färdigheter eller korrigering av utförande av tidigare färdigheter, liksom på träning som syftar till att öka till exempel styrka, uthållighet eller rörlighet för ökad effektivitet och minskad skaderisk.

  • 36.
    Röijezon, Ulrik
    Luleå tekniska universitet, Institutionen för hälsovetenskap, Hälsa och rehabilitering.
    Motorisk kontroll och inlärning: Med inriktning på muskuloskeletal rehabilitering2019Samlingsverk (redaktörskap) (Övrigt vetenskapligt)
    Abstract [sv]

    Boken ger en aktuell kunskapsöversikt över fysiologiska system och mekanismer som är involverade i motorisk kontroll och motorisk inlärning, samt ger en beskrivning av kliniska metoder för undersökning och behandling.

    Boken är uppdelad i tre delar:

    • Del 1 omfattar generella teoretiska kunskaper inom bland annat muskel- och neurofysiologi, sensomotorisk kontroll, patofysiologi och motorisk inlärning.
    • Del 2 beskriver övergripande olika koncept och system för undersökning och träning av motorisk kontroll.
    • Del 3 har en mer specifik inriktning med presentation av sensomotoriska funktionsstörningar och metoder för undersökning och träning för varje separat kroppsdel, från nacke till fot. Denna del avslutas med ett kapitel om hypermobilitet.

    Motorisk kontroll och inlärning är författad av en mycket framstående grupp svenska och internationella forskare och kliniker som generöst bidrar med sin expertkompetens till bokens olika kapitel.

    Boken vänder sig till personer som utbildar sig eller är verksamma inom prevention och rehabilitering av muskuloskeletala besvärstillstånd, såsom fysioterapeuter, arbetsterapeuter, läkare, kiropraktorer, osteopater och naprapater, men även andra som arbetar med rörelsebeteende och inlärning, till exempel idrottslärare och idrottstränare.

  • 37.
    Röijezon, Ulrik
    Luleå tekniska universitet, Institutionen för hälsovetenskap, Hälsa och rehabilitering.
    Patofysiologiska modeller: samband mellan smärta och störningar i motorisk kontroll2019Ingår i: Motorisk kontroll och inlärning: Med inriktning på muskuloskeletal rehabilitering / [ed] Ulrik Röijezon, Lund: Studentlitteratur AB, 2019, 1, s. 117-126Kapitel i bok, del av antologi (Övrigt vetenskapligt)
    Abstract [sv]

    En mängd olika störningar i sensoriska och motoriska funktioner har beskrivits vid smärttillstånd i rörelseapparaten. Bland annat störd proprioception, neuromuskulär koordination och balans samt förändrade hållnings- och rörelsemönster. Utifrån empiriska studier på personer med muskuloskeletala besvär och experimentella studier på såväl människor som djur har flera olika teoretiska modeller utvecklats för att beskriva de fysiologiska mekanismerna bakom sambanden mellan smärta och störningar i motoriska kontrollfunktioner. Några av de mest uppmärksammade modellerna presenteras i detta kapitel. Dessa modeller skiljer sig åt i vissa avseenden, men inte i alla. I huvudsak kompletterar de dock varandra och ger värdefulla förklaringar till möjliga mekanismer bakom uppkomst, återkomst och långvarighet av muskuloskeletala besvär, och dess samband med förändringar i motoriska kontrollfunktioner.

  • 38.
    Röijezon, Ulrik
    Luleå tekniska universitet, Institutionen för hälsovetenskap, Hälsa och rehabilitering.
    Projekt: Hälsa och prestation vid Musicerande2012Övrigt (Övrig (populärvetenskap, debatt, mm))
    Abstract [sv]

    Projektet involverar studier av muskuloskeletala besvär och påverkan på rörelsekontroll hos musiker. Finansiering sker bland annat via Post Doc anslag från Forskningsrådet för Arbetsliv och Socialvetenskap (FAS).

  • 39.
    Röijezon, Ulrik
    Luleå tekniska universitet, Institutionen för hälsovetenskap, Hälsa och rehabilitering.
    Proprioception vid idrott, prevention och rehabilitering2016Ingår i: Svensk idrottsmedicin, ISSN 1103-7652, Vol. 2016, nr 2, s. 8-9Artikel i tidskrift (Övrigt vetenskapligt)
    Abstract [sv]

    Proprioception är viktig för god sensomotorisk kontroll och därmed för flertalet olika idrotter. Forskningsstudier har rapporterat att idrottare, i jämförelse med icke-idrottare, har god proprioception. Detta kan, åtminstone delvis, bero på utövandet av idrott. Nedsatt proprioception kan öka risken för skador, medan muskuloskeletala besvär per se kan bidra till nedsatt proprioception. Träning av proprioception är därför relevant både för att förbättra idrottsprestation och för prevention och rehabilitering av idrottsskador.

  • 40. Röijezon, Ulrik
    Sensorimotor function in chronic neck pain: Objective assessments and a novel method for neck coordination exercise2009Doktorsavhandling, sammanläggning (Övrigt vetenskapligt)
  • 41. Röijezon, Ulrik
    Sensorimotorisk funktion vid kroniska nackbesvär: Objektiva undersökningar och en nyutvecklad metod för nackkoordinationsträning2010Konferensbidrag (Övrigt vetenskapligt)
  • 42.
    Röijezon, Ulrik
    Luleå tekniska universitet, Institutionen för hälsovetenskap, Hälsa och rehabilitering.
    Specialistkompetens inom artist- och musikerhälsa: Vem bryr sig?2013Ingår i: Fysioterapi, ISSN 1653-5804, nr 9, s. 45-Artikel i tidskrift (Övrig (populärvetenskap, debatt, mm))
    Ladda ner fulltext (pdf)
    FULLTEXT01
  • 43.
    Röijezon, Ulrik
    Luleå tekniska universitet, Institutionen för hälsovetenskap, Hälsa och rehabilitering.
    Undersökning och träning av proprioception vid rehabilitering av muskuloskeletala besvär2016Ingår i: BestPractice, ISSN 1902-7583, Vol. 8, nr 26, s. 23-25Artikel i tidskrift (Övrigt vetenskapligt)
    Abstract [sv]

    Proprioceptionen är viktig för god sensomotorisk kontroll, och den kan bli störd vid muskuloskeletala besvärstillstånd av såväl traumatisk som icke-traumatiskt ursprung, men även av uttröttning respektive immobilisering. Undersökning och träning av proprioception har därför betydelse vid såväl prevention som rehabilitering av muskuloskeletala besvär. Kliniska metoder har utvecklats för undersökning och träning med till exempel laserpekare och dynamometrar, men den tekniska utvecklingen med sensorer i smarta mobiltelefoner och tv-spel skapar nya möjligheter för användarvänliga och billiga undersöknings- och träningsmetoder.

  • 44.
    Röijezon, Ulrik
    et al.
    Luleå tekniska universitet, Institutionen för hälsovetenskap, Hälsa och rehabilitering.
    Ardel, Dag
    Department of Community Medicine and Rehabilitation, Physiotherapy, Umeå University.
    Rissén, Dag
    Centre for Research & Development, Uppsala University/Region of Gävleborg, Gävle, Sweden;Centre for Musculoskeletal Research, Department of Occupational and Public Health Sciences, Faculty of Health and Occupational Studies, University of Gävle, Gävle, Sweden.
    Fjellman-Wiklund, Anncristine
    Department of Community Medicine and Rehabilitation, Physiotherapy, Umeå University.
    Juul-Kristensen, Birgit
    Institute of Sports Science and Clinical Biomechanics, University of Southern Denmark, Odense, Denmark.
    Generalised Joint Hypermobility and musculoskeletal pain among professional classical orchestra musicians in Sweden – a pilot study2015Ingår i: Musician's Health and Performance. 2nd Conference (MHPC2015): Book of Abstracts, Odense, 2015, artikel-id 49Konferensbidrag (Refereegranskat)
    Ladda ner fulltext (pdf)
    fulltext
  • 45.
    Röijezon, Ulrik
    et al.
    Luleå tekniska universitet, Institutionen för hälsovetenskap, Hälsa och rehabilitering.
    Berg, Jan
    Luleå tekniska universitet, Institutionen för konst, kommunikation och lärande, Medier, ljudteknik och teater.
    Larsson, Agneta
    Luleå tekniska universitet, Institutionen för hälsovetenskap, Hälsa och rehabilitering.
    Sundkvist, Petter
    Luleå tekniska universitet, Institutionen för konst, kommunikation och lärande, Musik och dans.
    Sitting postures’ effects on movement behavior and musical performance among high string musicians – a pilot study2018Konferensbidrag (Övrigt vetenskapligt)
    Abstract [en]

    The posture has a major influence on the body; e.g., a slumped posture can lead to increased tissue loading but also altered movement behavior. Musicians, including violinists/violists, have a high prevalence of upper body musculoskeletal disorders. Biomechanical risk factors include repetitive movements, altered muscle activation and awkward postures. Changes in posture may have implications for both injury risk and the musical performance. Ideally, a healthy posture leads to the desired qualities of the performance, but this is still to be investigated. This multidisciplinary study takes an initial step to unravel the impact on both movement behavior and musical quality related to playing posture among high string musicians.

  • 46.
    Röijezon, Ulrik
    et al.
    Luleå tekniska universitet, Institutionen för hälsovetenskap, Hälsa och rehabilitering.
    Bexander, Catharina
    Koordination av öga, huvud och hand2019Ingår i: Motorisk kontroll och inlärning: Med inriktning på muskuloskeletal rehabilitering / [ed] Ulrik Röijezon, Lund: Studentlitteratur AB, 2019, s. 79-90Kapitel i bok, del av antologi (Övrigt vetenskapligt)
    Abstract [sv]

    Vid manuella uppgifter som att äta, laga mat, snickra, spela bordtennis eller sätta en nyckel i ett lås är det synen som vägleder handens rörelse. För att kunna tolka synintrycken korrekt måste kroppen känna till huvudets position och rörelse, dels i rummet och dels i förhållande till bålen. Dessutom måste denna information samordnas med information om handens och armens position och rörelse i förhållande till bålen. Motoriska kommandon för såväl ögon, huvud, arm och hand måste koordineras så att rörelserna utförs med stor precision. Detta involverar en mängd sensoriska och motoriska omkopplingar och kontrollprocesser och inkluderar såväl reflexer som viljemässiga rörelser. I detta kapitel beskrivs samordningen av öga–nacke och öga–huvud–handrörelser. Dessutom ges några exempel på hur smärttillstånd kan störa denna koordination.

  • 47. Röijezon, Ulrik
    et al.
    Björklund, Martin
    Bergenheim, Mikael
    Djupsjöbacka, Mats
    A novel method for neck coordination exercise: a pilot study on persons with chronic non-specific neck pain2008Ingår i: Journal of NeuroEngineering and Rehabilitation, E-ISSN 1743-0003, Vol. 5, nr 36Artikel i tidskrift (Refereegranskat)
    Ladda ner fulltext (pdf)
    fulltext
  • 48. Röijezon, Ulrik
    et al.
    Björklund, Martin
    Djupsjöbacka, Mats
    A novel method for neck coordination exercise – a pilot study on persons with chronic non-specific neck pain2008Ingår i: XVIIth Congress of the International Society of Electrophysiology and Kinesiology, 2008Konferensbidrag (Refereegranskat)
  • 49. Röijezon, Ulrik
    et al.
    Björklund, Martin
    Djupsjöbacka, Mats
    A novel method of neck coordination exercise – effects on sensorimotor functions and self reported health and functioning2007Ingår i: 15th International WCPT Congress, World Physical Therapy, 2007Konferensbidrag (Refereegranskat)
  • 50.
    Röijezon, Ulrik
    et al.
    Luleå tekniska universitet, Institutionen för hälsovetenskap, Hälsa och rehabilitering.
    Björklund, Martin
    University of Gävle, Centre of Musculoskeletal Research.
    Djupsjöbacka, Mats
    University of Gävle, Centre of Musculoskeletal Research.
    The slow and fast components of postural sway in chronic neck pain2011Ingår i: Manual Therapy, ISSN 1356-689X, E-ISSN 1532-2769, Vol. 16, nr 3, s. 273-278Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Background: Several studies have reported altered postural control in people with neck pain. The aim of this study was to increase the understanding of the nature of altered postural control in neck pain by studying the slow and fast components of body sway. Methods: Subjects with whiplash associated disorders (WAD, n = 21) and chronic non-specific neck pain (NS, n = 24) were compared to healthy controls (CON, n = 21) in this cross-sectional study. The magnitudes of the slow and fast sway components were assessed in Rhomberg quiet stance for 30 s on a force plate with eyes closed. We also investigated associations between postural sway and symptoms, self-ratings of functioning and kinesiophobia. Results: Increased magnitude of the slow sway component was found in WAD, but not in NS. Greater magnitude of the slow component in WAD was associated with poorer physical functioning, including balance disturbances, and more severe sensory symptoms. Conclusions: Increased magnitude of the slow sway component implies an aberration in sensory feedback or processing of sensory information in WAD. The associations between postural sway and self-rated characteristics support the clinical validity of the test. Further investigation into NS, involving a longer test time is warranted

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