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Sweating and tympanic temperature during warm water immersion compared between Vietnamese and Japanese living in
My-Hang Nguyen1, Hiromi Tokura
1KYOUSEI Science Center for Life and Science, Graduate School of Human Culture, Nara Women's University, Nara 630-8506, Japan.
Abstract:
The present study compared between Japanese and Vietnamese subjects living in Hanoi, the local evaporation rate by sweating and the tympanic temperature during legs immersion in warm water. Seven Vietnamese and seven Japanese (who had lived in Hanoi for 1-2 years) participated in the experiments, which were performed in April, 2001 in Hanoi (Vietnam). It was found that the tympanic temperature at which subjects started to sweat in the forearm was significantly higher in Vietnamese than in Japanese. In addition, the local amount of evaporation was significantly lower in Vietnamese subjects. We discussed the physiological reason for such different thermoregulatory responses in terms of different levels of set-point in the core temperature between Vietnamese and Japanese. It was concluded that the Vietnamese inhabitant commenced the sweating at higher tympanic temperature to identical warm stimuli and had lower sweating rate and higher tympanic temperature during the 40 min immersion of both legs to warm water than the Japanese inhabiting Hanoi for 1-2 years.
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