The influence of fatigue-induced increase in relative work rate on temperature regulation during exercise.

European Journal of Applied Physiology
Alan KacinIgor B Mekjavic

Abstract

Heat-loss responses during steady-load exercise are affected by an increase in relative work rate induced by muscle ischaemia or hypoxaemia. The present study investigated whether progressive increases in perception of exertion and relative oxygen uptake %VO2peak which occur during prolonged steady-load exercise as a result of progressively increased peripheral fatigue, might also affect the regulation of heat loss responses and hence the exercise-induced increase in mean body temperature. Ten male subjects first performed a ramp-test to exhaustion on a cycle ergometer to evaluate their initial peak oxygen uptake (Control VO2peak). On a separate day, 120 min of cycling at constant power output corresponding to 60% of Control VO2peak was performed in thermoneutral environment (Ta = 23 degrees C, RH = 50%, wind speed = 5 m s(-1)). This was immediately followed by another maximal performance test (Fatigue VO2peak). During prolonged exercise, median (range) rating of perceived exertion for whole-body (RPEwb) increased (P < 0.01) from initial 3.5 (1-5) to 5.5 (5-9) at the end of exercise. Fatigue VO2peak and peak power output were 9 (5) and 10 (5)% lower (P < 0.01) when compared to control values. At the onset of exercise, heat prod...Continue Reading

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Citations

Dec 9, 2014·Physiology & Behavior·D Jason GillisMichael J Tipton
Jul 24, 2010·Australian and New Zealand Journal of Public Health·Tracey OakmanJessica Pritchard
Nov 29, 2013·Journal of Occupational and Environmental Hygiene·Gregory W McGarrStephen S Cheung
Nov 21, 2007·European Journal of Applied Physiology·Jürgen Werner

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