Contractile muscle volume and agonist-antagonist coactivation account for differences in torque between young and older women

被引:243
作者
Macaluso, A
Nimmo, MA
Foster, JE
Cockburn, M
McMillan, NC
De Vito, G
机构
[1] Univ Strathclyde, Appl Physiol Grp, Strathclyde Inst Biomed Sci, Glasgow G13 1PP, Lanark, Scotland
[2] Univ Glasgow, Western Infirm, Dept Clin Phys, Glasgow G11 6NT, Lanark, Scotland
[3] Univ Glasgow, Western Infirm, Dept Radiol, Glasgow G11 6NT, Lanark, Scotland
关键词
aging muscle; coactivation; muscle imaging; muscle volume; specific tension;
D O I
10.1002/mus.10113
中图分类号
R74 [神经病学与精神病学];
学科分类号
摘要
It is controversial whether specific tension (the ratio between muscle strength and size) declines with aging. Therefore, contractile muscle volume was estimated separately from the intramuscular noncontractile tissue by magnetic resonance imaging, and maximum isometric torque was measured in the knee extensors and flexors of 10 young (22.8 +/- 5.7 years) and 10 older (69.5 +/- 2.4 years) healthy active women. Specific tension was lower in the older women both in the extensors (93.1 +/- 20.1 kN.m(-2) vs. 112.1 +/- 12.3 kN.m(-2); P < 0.05) and in the flexors (100 ± 31 kN.m(-2) vs. 142.7 ± 23.9 kN.m(-2); P < 0.01). This was accompanied by an increase in the percentage coactivation of the knee flexors during knee extension. These data suggest that the lower level of muscle torque in the older women can be explained not only by smaller contractile muscle mass but also by increased coactivation of the antagonist muscles during knee extension. (C) 2002 Wiley Periodicals, Inc.
引用
收藏
页码:858 / 863
页数:6
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