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

Macaluso, A. and Nimmo, M.A. and Foster, J.E. and Cockburn, M. and McMillan, N.C. and De Vito, G. (2002) Contractile muscle volume and agonist-antagonist coactivation account for differences in torque between young and older women. Muscle and Nerve, 25 (6). pp. 858-863. ISSN 0148-639X

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Abstract

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 &PLUSMN; 31 kN.m(-2) vs. 142.7 &PLUSMN; 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.

Item type: Article
ID code: 23399
Keywords: aging muscle, coactivation, muscle imaging, muscle volume, specific tension, Pharmacy and materia medica, Clinical Neurology, Cellular and Molecular Neuroscience, Physiology, Physiology (medical)
Subjects: Medicine > Pharmacy and materia medica
Department: Faculty of Science > Strathclyde Institute of Pharmacy and Biomedical Sciences
Faculty of Science > Strathclyde Institute of Pharmacy and Biomedical Sciences > Applied Physiology
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    Depositing user: Strathprints Administrator
    Date Deposited: 09 Jul 2010 11:27
    Last modified: 05 Sep 2014 04:36
    URI: http://strathprints.strath.ac.uk/id/eprint/23399

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