Aerobic and anaerobic responses to incremental exercise in a thermoneutral and a hot dry environment

Acta Physiologica Scandinavica
J SmolanderR Ilmarinen

Abstract

In an investigation of the effect of acute heat exposure on aerobic and anaerobic metabolism, eight unacclimated men performed two incremental bicycle ergometer tests in random order, once under thermoneutral conditions (25 degrees C) and once in a hot dry (40 degrees C) environment. Oxygen consumption (VO2) and pulmonary ventilation were measured every minute. Fingertip blood samples were taken at each work level for blood lactate (LA) determination. Compared to the results at 25 degrees C, the mean VO2 was significantly (P less than 0.01) lower during exercise at 40 degrees C. In the hot dry environment the blood lactate threshold was slightly reduced in four subjects, but neither the average peak nor the post-exercise blood LA values differed from the findings at 25 degrees C. During the exercise-heat stress, the ventilatory threshold did not change significantly. The results indicated that, during relatively short-term incremental exercise in a hot environment, almost adequate muscle metabolism can be maintained.

References

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Citations

Jan 1, 1992·European Journal of Applied Physiology and Occupational Physiology·J Smolander, V Louhevaara
Feb 1, 1990·Acta Physiologica Scandinavica·V LouhevaaraP Teräslinna
Dec 1, 1996·Canadian Journal of Applied Physiology = Revue Canadienne De Physiologie Appliquée·F Trudeau, M Milot
Jan 1, 1988·European Journal of Applied Physiology and Occupational Physiology·T McLellanW Lewis
Sep 12, 2017·BioMed Research International·Ping GengJian-Yong Wu
Sep 17, 2020·The Journal of Sports Medicine and Physical Fitness·Keiko InoueTetsuya Yoshida

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