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The Strathprints institutional repository is a digital archive of University of Strathclyde's Open Access research outputs. Strathprints provides access to thousands of Open Access research papers by University of Strathclyde researchers, including by researchers from the Department of Computer & Information Sciences involved in mathematically structured programming, similarity and metric search, computer security, software systems, combinatronics and digital health.

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Effect of muscle temperature on rate of oxygen uptake during exercise in humans at different contraction frequencies

Ferguson, R.A. and Ball, D. and Sargeant, A.J. (2002) Effect of muscle temperature on rate of oxygen uptake during exercise in humans at different contraction frequencies. Journal of Experimental Biology, 205 (7). pp. 981-987. ISSN 0022-0949

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Abstract

The effect of elevated human muscle temperature on energy turnover was investigated during cycling exercise (at 85 % of V-O2max) at a contraction frequency of 60revs min(-1). Muscle temperature was passively elevated prior to exercise by immersion of the legs in a hot water bath (42degreesC). During exercise at this low pedalling rate, total energy turnover was higher (P<0.05) when muscle temperature was elevated compared with normal temperature (70.4+/-3.7 versus 66.9+/-2.4kJ min(-1), respectively). Estimated net mechanical efficiency was found to be lower when muscle temperature was elevated. A second experiment was conducted in which the effect of elevated human muscle temperature on energy turnover was investigated during cycling exercise (at 85 % of V-O2max) at a contraction frequency of 120 revs min(-1). Under the conditions of a high pedalling frequency, an elevated muscle temperature resulted in a lower energy turnover (P<0.05) compared with the normal muscle temperature (64.9 +/- 3.7 versus 69.0 +/- 4.7 kJmin(-1), respectively). The estimated net mechanical efficiency was therefore higher when muscle temperature was elevated. We propose that, in these experiments, prior heating results in an inappropriately fast rate of cross-bridge cycling when exercising at 60 revs min(-1), leading to an increased energy turnover and decreased efficiency.; However, at the faster pedalling rate, the effect of heating the muscle shifts the efficiency/velocity relationship to the right so that crossbridge detachment is more appropriately matched to the contraction velocity and, hence, energy turnover is reduced.