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Interaction between muscle temperature and contraction velocity affects mechanical efficiency during moderate-intensity cycling exercise in young and older women

journal contribution
posted on 23.06.2014, 13:58 by Martin P. Bell, Richard Ferguson
The effect of elevated muscle temperature on mechanical efficiency was investigated during exercise at different pedal frequencies in young and older women. Eight young (24 ± 3 yr) and eight older (70 ± 4 yr) women performed 6-min periods of cycling at 75% ventilatory threshold at pedal frequencies of 45, 60, 75, and 90 rpm under control and passively elevated local muscle temperature conditions. Mechanical efficiency was calculated from the ratio of energy turnover (pulmonary O uptake) and mechanical power output. Overall, elevating muscle temperature increased (P < 0.05) mechanical efficiency in young (32.0 ± 3.1 to 34.0 ± 5.5%) and decreased (P < 0.05) efficiency in older women (30.2 ± 5.6 to 27.9 ± 4.1%). The different effect of elevated muscle temperature in young and older women reflects a shift in the efficiency-velocity relationship of skeletal muscle. These effects may be due to differences in recruitment patterns, as well as sarcopenic and fiber-type changes with age. Copyright © 2009 the American Physiological Society.

History

School

  • Sport, Exercise and Health Sciences

Published in

Journal of Applied Physiology

Volume

107

Issue

3

Pages

763 - 769

Citation

BELL, M.P. and FERGUSON, R.A., 2009. Interaction between muscle temperature and contraction velocity affects mechanical efficiency during moderate-intensity cycling exercise in young and older women. Journal of Applied Physiology, 107 (3), pp. 763 - 769

Publisher

© American Physiological Society

Version

AM (Accepted Manuscript)

Publication date

2009

Notes

This article is closed access.

ISSN

8750-7587

eISSN

1522-1601

Language

en

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Keywords

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