Abstract:
BACKGROUND:In adult males, cross-sectional area (CSA) for type II muscle fibers is generally larger than for type I fibers. In this cross-sectional study the aim was to compare sex-related CSAs of various muscle fiber types during childhood-to-adulthood transition. METHODS:Percutaneous biopsy samples were obtained from vastus lateralis in 10-y-old children (10 males and 5 females) and in young adults (9 males and 7 females). Fiber types were classified by myofibrillar ATPase and CSAs from NADH-dehydrogenase staining. RESULTS:Type IIA were larger than type I fibers in adult males, but not in adult females or children (age x sex x fiber type, P < .002). When including all participants, body weight and sex explained 78% of the variation in type IIA CSA but only body weight contributed for type I. CONCLUSIONS:Sex-specific patterns in CSA of the muscle fiber types appears to develop during the transition from childhood to adulthood.
journal_name
Muscle Nervejournal_title
Muscle & nerveauthors
Esbjörnsson ME,Dahlström MS,Gierup JW,Jansson ECdoi
10.1002/mus.27151subject
Has Abstractpub_date
2020-12-21 00:00:00eissn
0148-639Xissn
1097-4598pub_type
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