Age- and sex-dependence of muscle quality: Influence of intramuscular non-contractile tissues.

Autor: Ichinose H; Graduate School of Sport Sciences, Waseda University, Saitama, Japan., Tanaka F; Human Performance Laboratory, Comprehensive Research Organization of Waseda University, Tokyo, Japan; Faculty of Science and Engineering, Waseda University, Tokyo, Japan., Yamagishi T; Human Performance Laboratory, Comprehensive Research Organization of Waseda University, Tokyo, Japan; Department of Sport Science and Research, Japan Institute of Sports Sciences, Tokyo, Japan., Sado N; Institute of Health and Sport Sciences, University of Tsukuba, Ibaraki, Japan., Shiotani H; Faculty of Sport Sciences, Waseda University, Saitama, Japan., Evangelidis PE; Faculty of Sport Sciences, Waseda University, Saitama, Japan; Medical School, University of Exeter, UK., Naito M; Human Performance Laboratory, Comprehensive Research Organization of Waseda University, Tokyo, Japan; Department of Anatomy, Aichi Medical University, Aichi, Japan., Shibata S; Faculty of Science and Engineering, Waseda University, Tokyo, Japan; Graduate School of Biomedical and Health Sciences, Hiroshima University, Hiroshima, Japan., Kawakami Y; Human Performance Laboratory, Comprehensive Research Organization of Waseda University, Tokyo, Japan; Faculty of Sport Sciences, Waseda University, Saitama, Japan. Electronic address: ykawa@waseda.jp.
Jazyk: angličtina
Zdroj: Experimental gerontology [Exp Gerontol] 2024 Oct 15; Vol. 196, pp. 112574. Date of Electronic Publication: 2024 Sep 06.
DOI: 10.1016/j.exger.2024.112574
Abstrakt: Purpose: Muscle quality is explained by the ratio between muscle size and strength. Conventionally, muscle size is evaluated without considering the composition of contractile and non-contractile tissues in muscle, hence the influence of non-contractile tissues on muscle quality is not fully understood, especially within aging muscle. This study investigated the differences in intramuscular non-contractile tissues between different age and sex groups, and investigated their influence on muscle quality.
Methods: Eighty-two older and 64 young females and males participated. Muscle cross-sectional area (quadriceps and hamstrings), separating contractile and non-contractile areas, was calculated from the magnetic resonance image of the right mid-thigh. Maximal voluntary isometric knee extension and flexion torque was measured. Torque/muscle area and torque/contractile area were calculated for each age and sex group.
Results: Non-contractile/muscle area was higher in older than in young individuals in both muscle groups (p < 0.05), and it was greater in the hamstrings than in the quadriceps. For the hamstrings, torque/muscle area was lower in older than in young individuals in both sexes (p < 0.05). However, torque/contractile area did not show the differences between age groups, only between sexes (males>females) (p < 0.05).
Conclusions: The results indicate that 1) the presence of non-contractile tissues varies by age and muscle groups, 2) the extensive presence of non-contractile tissues can contribute to the underestimation of its muscle quality, and 3) the sex differences in muscle quality are influenced by factors other than muscle composition.
Competing Interests: Declaration of competing interest The authors declare that they have no conflicts of interest.
(Copyright © 2024 The Authors. Published by Elsevier Inc. All rights reserved.)
Databáze: MEDLINE
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