期刊
EUROPEAN JOURNAL OF APPLIED PHYSIOLOGY
卷 109, 期 5, 页码 973-981出版社
SPRINGER
DOI: 10.1007/s00421-010-1436-4
关键词
Dehydration; Sweat rate; Skin blood flow; Heat balance; Aerobically trained
To determine if the increases in rectal temperature (TREC) during exercise in the heat at a given percent of (V)over dotO(2peak) depend on a subject's aerobic fitness level. On three occasions, 10 endurance-trained (Tr) and 10 untrained (UTr) subjects ((V)over dotO(2peak): 60 +/- 6 vs. 44 +/- 3 mL kg(-1) min(-1), P < 0.05) cycled in a hot-dry environment (36 +/- 1 degrees C; 25 +/- 2% humidity, airflow 2.5 m s(-1)) at three workloads (40, 60, and 80% (V)over dotO(2peak)). At the same percent of (V)over dotO(2peak), on average, Tr had 28 +/- 5% higher heat production but also higher skin blood flow (29 +/- 3%) and sweat rate (20 +/- 7%; P = 0.07) and lower skin temperature (0.5 degrees C; P < 0.05). Pre-exercise TREC was lower in the Tr subjects (37.4 +/- 0.2 vs. 37.6 +/- 0.2; P < 0.05) but similar to the UTr at the end of 40 and 60% (V)over dotO(2peak) trials. Thus, exercise TREC increased more in the Tr group than in the UTr group (0.6 +/- 0.1 vs. 0.3 +/- 0.1 degrees C at 40% (V)over dotO(2peak) and 1.0 +/- 0.1 vs. 0.6 +/- 0.3 degrees C at 60% (V)over dotO(2peak); P < 0.05). At 80% (V)over dotO(2peak) not only the increase in TREC (1.7 +/- 0.1 vs. 1.3 +/- 0.3 degrees C) but also the final TREC was larger in Tr than in UTr subjects (39.15 +/- 0.1 vs. 38.85 +/- 0.1 degrees C; P < 0.05). During exercise in the heat at the same relative intensity, aerobically trained individuals have a larger rise in TREC than do the untrained ones which renders them more hyperthermic after high-intensity exercise.
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