The influence of exercise intensity on heat acclimation in trained subjects

Houmard, Joseph, Costill, David, Davis, Jackie J., Mitchell, Joel B., Pascoe, David D., & Robergs, Robert A. (1990) The influence of exercise intensity on heat acclimation in trained subjects. Medicine and Science in Sports and Exercise, 22(5), pp. 615-620.

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Abstract

Low-intensity exercise (≤50% VO2max) has been demonstrated to produce heat acclimation (HA) in trained subjects. The purpose of this study was to determine whether shorter-duration, moderate-intensity exercise would also result in HA. Nine trained runners performed two 9-d exercise heatstress protocols. Each protocol consisted of a 90-min heat tolerance test on days 1 (HTT1) and 9 (HTT2). On days 2-8 the subjects exercised at 50% VO2max for 60 min·d−1 (T50) or at 75% VO2max for 30-35 min·d−1 (T75). Final HTT2 heart rate and rectal temperature (Tr) were significantly (P < 0.001) reduced, as compared to HTT, with no differences between T50 and T75. Both protocols resulted in significant (P < 0.05) reductions in HTT2 pre-exercise Tr and total exercising caloric expenditure, both of which are known to contribute to HA. No changes in resting plasma volume, osmolality, protein, post-HTT aldosterone, and exercising sweat rate were observed. These results demonstrate that equal levels of HA were obtained with T50 and T75, which suggests that moderate-intensity, short-duration exercise in the heat can produce HA in trained subjects. © 1990 by the American College of Sports Medicine.

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63 citations in Scopus
50 citations in Web of Science®
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ID Code: 96703
Item Type: Journal Article
Refereed: Yes
Keywords: adult; article; athlete; body temperature; energy expenditure; exercise; heart rate; heat acclimatization; heat tolerance; human; human experiment; male; normal human; priority journal; running; training, Acclimatization; Adult; Body Temperature; Body Temperature Regulation; Energy Metabolism; Exercise; Heart Rate; Heat; Human; Male; Physical Endurance; Running; Support, U.S. Gov't, P.H.S.; Time Factors
ISSN: 1530-0315
Divisions: Current > Schools > School of Exercise & Nutrition Sciences
Deposited On: 07 Jul 2016 01:41
Last Modified: 07 Jul 2016 01:41

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