Yotaro Kobayashi

The influence of ethnic differences upon human responses due to thermal environment

Abstract 1. 1. The influence of ethnic differences is discussed with reference to the following issues. 2. 2. It has been found that total numbers of active sweat glands increase in tropical populations compared with people from northern latitudes. 3. 3. It has also been observed that the active sweat glands of Eskimos are fewer than those of Caucasians. 4. 4. The rate of the evaporated sweat loss was calculated by measuring body weight loss and it was found that the evaporated sweat loss of Caucasians is larger than that of Japanese in the same climate. 5. 5. Meteorological factors might have been responsible for the smaller loss in Japanese compared with that of Japanese-Americans. 6. 6. Under the same experimental conditions, it was observed that there were little or no differences between the Caucasians and Negros.