Abstract
In this study, the blood oxygen saturation of 10 volunteers performing light, medium and heavy physical labors were examined under different climatic conditions in a chamber. The climatic conditions referred to one group of comfort environment (25°C dry bulb temperature and 50% relative humidity) and three groups of thermal environment (30°C, 35°C, 40°Cdry bulb temperature and 90% relative humidity). The results reveal the blood oxygen saturation of subjects performing same physical labor decreased in different thermal environments, the values within normal variations. The blood oxygen saturation of subjects performing different physical labors decreased in same environmental condition, the values also within normal variations. It shows in conditions of 30~40°C, 90%relative humidity, human bodies under light, medium and heavy physical labors ingested less oxygen compared with the thermal comfort environment. And it indicates the human body oxygen delivery is decreasing and in anaerobic condition in hot environment.
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