Possible Biphasic Sweating Response during Short-term Heat Acclimation Protocol for Tropical Natives

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The aim of the present study was to evaluate the sweat loss response during short-term heat acclimation in tropical natives. Six healthy young male subjects, inhabitants of a tropical region, were heat acclimated by means of nine days of one-hour heat-exercise treatments (40±0℃ and 32±1% relative humidity; 50% VO_<2peak> on a cycle ergometer). On days 1 to 9 of heat acclimation whole-body sweat loss was calculated by body weight variation corrected for body surface area. On days 1 and 9 rectal temperature (T_<re>) and heart rate (HR) were measured continuously, and rating of perceived exertion (RPE) every 4 minutes. Heat acclimation was confirmed by reduced HR (day 1 rest: 77±5b・min^<-1>; day 9 rest: 68±3b・min^<-1>; day 1 final exercise: 161±15b・min^<-1>; day 9 final exercise: 145±11b・min^<-1>, p<0.05), RPE (13 vs.11, p<0.05) and T_<re> (day 1 rest: 37.2±0.2℃; day 9 rest: 37.0±0.2℃; day 1 final exercise: 38.2±0.2℃; day 9 final exercise: 37.9±0.1℃, p<0.05). The main finding was that whole-body sweat loss increased in days 5 and 7 (9.49±1.84 and 9.56±1.86g・m^<-2>・min^<-1>, respectively) compared to day 1 (8.31±1.31g・m^<-2>・min^<-1>, p<0.05) and was not different in day 9 (8.48±1.02g・m^<-2>・min^<-1>) compared to day 1 (p>0.05) of the protocol. These findings are consistent with the heat acclimation induced adaptations and suggest a biphasic sweat response (an increase in the sweat rate in the middle of the protocol followed by return to initial values by the end of it) during short-term heat acclimation in tropical natives.
日本生理人類学会の論文

Possible Biphasic Sweating Response during Short-term Heat Acclimation Protocol for Tropical Natives

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