Fatigue-Free Force-Velocity and Power-Velocity Profiles for Elite Track Sprint Cyclists: The Influence of Duration, Gear Ratio and Pedalling Rates
2022 (English)In: Sports, E-ISSN 2075-4663, Vol. 10, no 9, article id 130Article in journal (Refereed) Published
Abstract [en]
Background: Maximal force-velocity (F/v) profiles for track cyclists are commonly derived from ergometer sprints using an isovelocity or isoinertial approach. Previously, an attempt was made to derive maximal F/v profiles from a single maximal 65-m sprint on the cycling track. Hypothesising that this approach may not accurately reflect the fatigue-free F/v profile, we propose an alternative procedure and compare it to the previous method. Moreover, we test for the impact of gear ratio on diagnostic results.
Methods: Twelve elite track cyclists completed a high-cadence low-resistance pedalling test on a freestanding roller (motoric test) and two series of three maximal 65-m sprints on a cycling track with different gear ratios. F/v profiles were calculated based on the measured crank force and cadence either during the first 6–7 revolutions (≤6 s) on the track (model I) or were derived from the first 3–4 revolutions (≤3 s) on the track combined with 1 or 2 fatigue-free cycles at cadences above 160 rpm from the motoric test (model II).
Results: Although both models exhibit high-to-excellent linearity between force and velocity, the extrapolated isometric force was higher (1507.51 ± 257.60 N and 1384.35 ± 276.84 N; p < 0.002; d = 2.555) and the slope steeper (−6.78 ± 1.17 and −5.24 ± 1.11; p < 0.003, d = −2.401) with model I. An ICC of 1.00 indicates excellent model consistency when comparing the F/v profiles (model II) derived from the different geared sprints.
Conclusions: Assuring fatigue-free measurements and including high-cadence data points in the calculations provide valid maximal F/v and P/v profiles from a single acceleration-sprint independent of gear ratio.
Place, publisher, year, edition, pages
MDPI, 2022. Vol. 10, no 9, article id 130
Keywords [en]
F/v-profile, validity, track cycling, fatigue-free performance, performance diagnostics
National Category
Sport and Fitness Sciences Physiology and Anatomy
Research subject
Physiotherapy; Centre - Swedish Sports Technology and Performance Research Centre (SPORTC)
Identifiers
URN: urn:nbn:se:ltu:diva-93290DOI: 10.3390/sports10090130ISI: 000857614600001PubMedID: 36136385Scopus ID: 2-s2.0-85138651247OAI: oai:DiVA.org:ltu-93290DiVA, id: diva2:1699588
Note
Validerad;2022;Nivå 2;2022-09-28 (joosat);
Funder: BMI (Federal Ministry of the Interior and Community, Germany)
2022-09-282022-09-282025-02-11Bibliographically approved