The effect of heat acclimation on maximal urine osmolality in humans

作者：Buono Michael J^*; Avila Steve; Garnero Lea; Fader Lindsay; Kolkhorst Fred W

来源：Journal of Thermal Biology, 2011, 36(3): 157-159.

DOI：10.1016/j.jtherbio.2011.01.001

• Heat acclimation
• Dehydration
• Renal concentration ability

The purpose of the current study was to determine the effect of 9 days of active heat acclimation on maximal urine osmolality (MUO) in humans. Eight subjects completed 9 days of heat acclimation, which consisted of a daily 90 min exercise session in a heated environmental chamber. Before and following heat acclimation the subjects abstained from drinking fluids for 15 h, and urine samples were collected to measure MUO. The subjects successfully heat acclimated as evidenced by a significant (P<0.05) decrease in the mean +/- SD exercise core temperature (37.7 +/- 0.3 degrees C on day 1 to 37.4 +/- 0.3 degrees C on day 9) and heart rate (143 +/- 17 bpm on day 1 to 128 +/- 14 bpm on day 9). The mean pre- and post-heat acclimation MUOs were 868 +/- 1:17 and 846 +/- 89 mmol kg(-1), respectively, which were not significantly different (P > 0.05). Previous studies have shown that prolonged dehydration can increase the MUO in various mammalian species, including humans. In contrast, the results of the current study suggest that 9 days of active heat acclimation, without significant dehydration, does not affect the MUO in humans.

• 出版日期2011-4