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Effects of 22ᵒc muscle temperature on voluntary and evoked muscle properties during and after high intensity exercise

Drinkwater, Eric J. and Behm, David G. 2007, Effects of 22ᵒc muscle temperature on voluntary and evoked muscle properties during and after high intensity exercise, Applied physiology, nutrition and metabolism, vol. 2, no. 4, pp. 1043-1051, doi: 10.1139/H07-069.

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Title Effects of 22ᵒc muscle temperature on voluntary and evoked muscle properties during and after high intensity exercise
Author(s) Drinkwater, Eric J.
Behm, David G.
Journal name Applied physiology, nutrition and metabolism
Volume number 2
Issue number 4
Start page 1043
End page 1051
Total pages 9
Publisher NRC Research Press
Place of publication Ottawa, Ont.
Publication date 2007
ISSN 1715-5320
Keyword(s) hyperemia
interpolated twitch technique
hypothermia
maximal voluntary contraction
electromyography
Summary The purpose of this study was to investigate the effect of 22 °C local muscle temperature of intact human plantar flexors performing fatiguing contractions on evoked and voluntary contractile properties before and after fatigue. Twelve subjects were tested on plantar flexor voluntary torque, percent muscle activation derived from twitch interpolation, integrated electromyographic (iEMG) activity, and evoked torque and temporal characteristics of maximal twitch and tetanic stimulations before fatigue and 1, 5, and 10 min after intermittent, high-intensity, isometric fatigue under both normothermic and hypothermic conditions. Hypothermic and normothermic changes between time points were analysed by repeated-measures analysis of variance. Normothermic fatigue induced small to large effects (Cohen’s d: 0.29–3.06) on voluntary and evoked contractile properties, whereas most effects of unfatigued hypothermia were limited to rate-dependent processes (Cohen’s d: 0.78–1.70). Most tetanic properties were potentiated 1 min after normothermic fatigue, but remained unchanged by hypothermic fatigue, resulting in significant differences between the two conditions. Soleus iEMG significantly declined 1 min after normothermic fatigue (–29%), but not after hypothermic fatigue. Twitch torque was potentiated by 29% one minute after fatigue while normothermic, but was potentiated by 46% while hypothermic; rate of twitch torque development and time to peak twitch were potentiated by 39% and 10% while normothermic, but 89% and 28% while hypothermic. Although voluntary contractile properties are generally impaired soon after normothermic fatigue, most were not after hypothermic fatigue. Furthermore, evoked contractile properties were generally higher 1 min after hypothermic fatigue. We conclude that the hypothermic condition slows the recovery of potentiated evoked contractile properties back to baseline values.
Language eng
DOI 10.1139/H07-069
Field of Research 110699 Human Movement and Sports Science not elsewhere classified
Socio Economic Objective 929999 Health not elsewhere classified
HERDC Research category C1.1 Refereed article in a scholarly journal
Copyright notice ©2007, NRC Research Press
Persistent URL http://hdl.handle.net/10536/DRO/DU:30083258

Document type: Journal Article
Collection: School of Exercise and Nutrition Sciences
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