A Basic Study on the Effects of Ambient Air Temperature and Humidity on the Heat Stress of Human Body

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  • 環境温湿度が人体に与える暑熱ストレスに関する基礎研究
  • 環境温湿度が人体に与える暑熱ストレスに関する基礎研究 : 生理・心理・自律神経・唾液アミラーゼ反応から
  • カンキョウオン シツド ガ ジンタイ ニ アタエル ショネツ ストレス ニ カンスル キソ ケンキュウ : セイリ ・ シンリ ・ ジリツ シンケイ ・ ダエキ アミラーゼ ハンノウ カラ
  • ― 生理・心理・自律神経・唾液アミラーゼ反応から ―
  • －from Physiological/Psychological/Autonomic-Nervous/ Salivary-Amylase-Activity Responses－

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<p>In order to clarify the heat stress effects, under ambient air temperature and humidity, on thermoregulation, psychological responses, autonomic nervous and salivary amylase activity of the human body, 6 young female subjects wearing only shorts and a brassiere were exposed to 9 conditions consisting of air temperature of 28℃, 31℃ and 34℃ and 30%, 60% and 90% relative humidity for 60 minutes. The results of the analysis of variance are summarized as follows: ①Mean skin temperature, sweat rate, skin moisture were significantly increased with an increase in air temperature and humidity, but rectal temperature showed no significant differences. ②Thermal, humid and uncomfortable sensations changed to the uncomfortable side with increasing temperature and humidity. ③Heart rate, LF (Low Frequency)/HF (High Frequency) and salivary amylase activity were significantly increased with an increase in air temperature and humidity, while HF showed only tendency to be decreased. ④High correlation coefficients between skin moisture and uncomfortable sensations (r=0.888), humid sensations (r=0.982), salivary amylase activity (r=0958) and LF/HF (r=0.910), suggested a dominant indicators of the heat stress. Salivary amylase activity and LF/HF were also suggested as an effective indicator of heat stress.</p>

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