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Title: Interaction between muscle temperature and contraction velocity affects mechanical efficiency during moderate-intensity cycling exercise in young and older women
Authors: Bell, Martin P.
Ferguson, Richard A.
Issue Date: 2009
Publisher: © American Physiological Society
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
Abstract: 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.
Description: This article is closed access.
Version: Accepted for publication
DOI: 10.1152/japplphysiol.91654.2008
URI: https://dspace.lboro.ac.uk/2134/14979
Publisher Link: http://dx.doi.org/10.1152/japplphysiol.91654.2008
ISSN: 8750-7587
Appears in Collections:Closed Access (Sport, Exercise and Health Sciences)

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