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

Content Provider	Springer Nature Link
Author	Kacin, Alan Golja, Petra Tipton, Michael J. Eiken, Ola Mekjavic, Igor B.
Copyright Year	2008
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 $$ (\% \dot\.{V}{\text{O}}_{{2{\text{peak}}}} ), $$ 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 $$ \dot\.{V}{\text{O}}_{{2{\text{peak}}}} $$ ). On a separate day, 120 min of cycling at constant power output corresponding to 60% of Control $$ \dot\.{V}{\text{O}}_{{2{\text{peak}}}} $$ was performed in thermoneutral environment (Ta = 23°C, RH = 50%, wind speed = 5 m s−1). This was immediately followed by another maximal performance test (Fatigue $$ \dot\.{V}{\text{O}}_{{2{\text{peak}}}} $$ ). 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 $$ \dot\.{V}{\text{O}}_{{2{\text{peak}}}} $$ 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 production, mechanical efficiency, heat loss and mean body temperature increased towards asymptotic values, thereafter remained constant throughout the 120 min exercise, despite the concomitant progressive increase in relative work rate, as reflected in increased RPEwb and relative oxygen uptake. It is thus concluded that the increase in relative work rate induced predominantly by peripheral muscle fatigue affects neither the level of increase in mean body temperature nor the regulation of heat loss responses during prolonged steady-load exercise.
Starting Page	71
Ending Page	77
Page Count	7
File Format	PDF
ISSN	14396319
Journal	European Journal of Applied Physiology
Volume Number	103
Issue Number	1
e-ISSN	14396327
Language	English
Publisher	Springer-Verlag
Publisher Date	2008-01-18
Publisher Place	Berlin/Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Prolonged exercise Fatigue Exercise thermoregulation Perceived exertion Relative work rate Sports Medicine Occupational Medicine/Industrial Medicine Human Physiology
Content Type	Text
Resource Type	Article
Subject	Orthopedics and Sports Medicine Physiology (medical) Public Health, Environmental and Occupational Health Sports Science

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