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.
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.
Impact and interest:
Citation counts are sourced monthly from and citation databases.
These databases contain citations from different subsets of available publications and different time periods and thus the citation count from each is usually different. Some works are not in either database and no count is displayed. Scopus includes citations from articles published in 1996 onwards, and Web of Science® generally from 1980 onwards.
Citations counts from theindexing service can be viewed at the linked Google Scholar™ search.
|Item Type:||Journal Article|
|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|
|Divisions:||Current > Schools > School of Exercise & Nutrition Sciences|
|Deposited On:||07 Jul 2016 01:41|
|Last Modified:||07 Jul 2016 01:41|
Repository Staff Only: item control page