The effects of skin oppression by wearing elastic sportswear was studied by means of immersing the legs in a water bath at the temperature of 42±0.5℃ and measuring the changes of skin temperature. The same measurement was made when naked as a control. The results were as follows.
　1. The subjects were three women. Subject A has four years' experience in aerobic dance and subject B has less than one year. They wear elastic sportswear daily. Subject C has no experience in sports.
　2. C showed the highest mean skin temperature measured at 8 points in elastic sportswear but when naked C showed the lowest. Under any condition C showed the greatest increase of mean skin temperature, and B showed the second greater, and then A the smallest. The skin temperature and the increase rate of it in A scarcely change in both conditions of wearing sportswear and naked body. The level and the rate of increased of skin temperature in B was in-between A and C. The mean truncus skin temperature (measured at 3 points) and the mean peripheral skin temperature (measured at 4 points) showed the same tendency as the mean skin temperature.
　3. The rectal temperature was slightly higher when wearing sportswear than when naked. Wearing sportswear, C showed the highest temperature, and B the second higher, and then A the lowest. The increases rate of rectal temperature was the greatest in C in both conditions, and the second greater in A and then in B. No difference in increase rate between wearing sportswear and being naked was observed in A and B.
　4. Systemic evaporation as estimated by the reduced body weight in C was small when wearing sportswear and great when naked.
　It was elucidated from the above that wearing elastic sportswear caused C of no experience of sports imbalance of the production and the radiation of heart, and affected the quantity of the radiation of heat.

DESCENTE SPORTS SCIENCE Vol.9/THE DESCENTE AND ISHIMOTO MEMORIAL FOUNDATION FOR THE PROMOTION SPORTS SCIENCE