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Study on Mechanisms of Heat Acclimatization Due to Thermal Sweating : Comparison of Heat-tolerance between Japanese and Thai Subjects


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タイトル: Study on Mechanisms of Heat Acclimatization Due to Thermal Sweating : Comparison of Heat-tolerance between Japanese and Thai Subjects
著者: Matsumoto, Takaaki / Kosaka, Mitsuo / Yamauchi, Masaki / Tsuchiya, Katsuhiko / Ohwatari, Nobu / Motomura, Masakatsu / Otomasu, Kinuyo / Yang, Guo-Jie / Lee, Jia-Ming / Boonayathap, Udom / Praputpittaya, Chucheep / Yongsiri, Anchalee
発行日: 1993年 5月 7日
出版者: 長崎大学熱帯医学研究所 / Institute of Tropical Medicine, Nagasaki University
引用: 熱帯医学 Tropical medicine 35(1). p23-34, 1993
抄録: Heat tolerance and sweat response to heat load of tropical subjects in Chiang Mai and temperate subjects in Nagasaki were compared under identical conditions. Male students in Chiang Mai (n=10) and in Nagasaki (n=10) volunteered for this study. The Thai subjects were a little shorter and slightly leaner than the Japanese. Heat load was applied on the legs by immersion into hot water (43℃) for 30 min in the room at 26.6℃ and 33%rh. Sublingual (oral) temperature was measured with a thermistor probe and local sweat rate was measured by the capacitance hygrometer-sweat capsule method. Change in oral temperature, sweat onset time and local sweat volume were compared between Japanese and Thai. Initial oral temperatures (36.76±0.11℃ in Japanese, 36.71±0.23℃ in Thai) were identical, and no sweat was observed before heat load. Mean sweat onset time (9.3±2.1 min chest in Japanese, 16.6±5.6 min chest in Thai) were significantly longer and local sweat volume (10.19±5.00 mg/cm^2, chest in Japanese, 1.39±0.91 mg/cm^2, chest in Thai) was significantly smaller in Thai subjects than Japanese, however, oral temperature (37.18±0.32℃) of Thai subjects was kept slightly lower than oral temperature (37.42±0.10℃) of Japanese even under a 30 min heat load. Sweat volume on the abdomen was larger than on the chest in 9 of 10 Thai subjects. On the contrary, sweat volume on the chest was larger than that on the abdomen in 7 of 10 Japanese subjects. These results suggest that heat tolerance of tropical subjects in due to a more efficient evaporative ability due to a greater heat loss brought about by their long term exposure to heat. Furthermore, the habituation phenomenon related to the reduction of thermoregulatory effector mechanisms were also considered so as to clarify the mechanisms of thermal acclimatization.
URI: http://hdl.handle.net/10069/4620
ISSN: 03855643
資料タイプ: Departmental Bulletin Paper
出現コレクション:第35巻 第1号

引用URI : http://hdl.handle.net/10069/4620

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