Physiological Responses During a Light Muscular Exercise in Conditions of Air Temperature between 20°C and 28°C

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  • OHNAKA Tadakatsu
    Department of Hygiene, School of Medicine, Showa University
  • TOCHIHARA Yutaka
    Department of Hygiene, School of Medicine, Showa University
  • YAMAZAKI Shinya
    Department of Hygiene, School of Medicine, Showa University
  • TANAKA Masatoshi
    Department of Hygiene, School of Medicine, Showa University
  • YOSHIDA Keiichi
    Department of Hygiene, School of Medicine, Showa University
  • OGAWA Shokichi
    Department of Hygiene, School of Medicine, Showa University Department of Physiological Hygiene, the Institute of Public Health
  • OSADA Yasutaka
    Department of Hygiene, School of Medicine, Showa University Department of Physiological Hygiene, the Institute of Public Health

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Other Title
  • 気温20～28°Cにおける軽作業時生理反応
  • キオン 20 28ドC ニ オケル ケイ サギョウジ セイリ ハンノウ エイブ

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Abstract

Eight male students, wearing only shorts, were exposed to 20, 22, 24, 26, and 28°C for 90 minutes on separate days. Relative humidity was 50% and air velocity was less than 20cm/sec. Subjects kept rest in sitting posture for 60 minutes and then took a light fixed work (40W) for 30 minutes on a bicycle ergometer. Their exercise metabolic rate, heart rate, rectal temperature, and mean skin temperature were measured. Measurements between the 25th and 30th minute of exercise were used for statistical analyses.<br>Metabolic rate at 26°C was significantly lower than that at 20, 22, 24, and 28°C. Heart rate, rectal temperature, and mean skin temperature increased progressively in cooperate with rising of environmental temperature. Linear relationship was observed between air temperature and heart rate. This results means that under conditions of air temperature between 20°C and 28°C the metabolic rate during a light muscular exercise is influenced by the environmental temperature similar to the cases of heart rate and body temperature.

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