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Growth and development of human muscle: a quantitative morphological study of whole vastus lateralis from childhood to adult age
Department of Neurology, University of Umeå.
Department of Neurology, University of Umeå.
Department of Mathematics, University of Strathclyde.
1992 (English)In: Muscle and Nerve, ISSN 0148-639X, E-ISSN 1097-4598, Vol. 15, no 3, p. 404-409Article in journal (Refereed) Published
Abstract [en]

The mechanisms underlying the increase in volume of muscle tissue, and the functional development of muscle fibers from childhood through adolescence to adult age, have been studied. Cross sections of autopsied whole vastus lateralis muscle from 22 previously physically healthy males, 5 to 37 years of age, were prepared enzyme histochemically (myofibrillar ATPase) and examined morphometrically. The data obtained on muscle cross-sectional area, size, total number, and proportion of type 1 (slow-twitch) and type 2 (fast-twitch) fibers were analyzed using linear regression techniques. The results show that the increase in muscle cross-sectional area from childhood to adult age is caused by an increase in mean fiber size. This is accompanied by a functional development of the fiber population: the proportion of type 2 fibers increases significantly from the age of 5 (approx. 35%) to the age of 20 (approx. 50%), which, in the absence of any discernible effect on the total number of fibers, is most likely caused by a transformation of type 1 to type 2 fibers.

Place, publisher, year, edition, pages
1992. Vol. 15, no 3, p. 404-409
Identifiers
URN: urn:nbn:se:ltu:diva-7699DOI: 10.1002/mus.880150323Local ID: 61d74810-7b24-11dc-a72d-000ea68e967bOAI: oai:DiVA.org:ltu-7699DiVA, id: diva2:980589
Note
Upprättat; 1992; 20071015 (lotfra)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2017-11-24Bibliographically approved

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