The purpose of the present study was to compare thermal responses of the body when walking in water between to put on warm swimsuit and normal one. The thermal responses were based on the examination of taking rectal, skin, and mean body temperatures at rest on land, in water and walking in water. Eight healthy women were the subjects in this experiment, and they were in average 20.5±0.7 in age, 165.0±4.1 cms in height, 53.9±3.1 kgs in weight, and 20.7±4.8 % in body fat.
　The subjects walked in water for 20 minutes. The experiment was tested under water temperature at 29.0°C during the walking. The rectal temperature decreased gradually during the walking in water. Wearing a normal swimsuit statistically showed significant decrease of rectal temperature at 20 minutes during the walking in water.
　The mean skin temperature decreased gradually during the walking in water. No statistically significant differences were detected in the mean skin temperature among swimsuits. The mean body temperature also showed a gradual decrease during at rest and the walking in water. The mean body temperature statistically showed significant decreases between warm and normal swimsuits.

DESCENTE SPORTS SCIENCE Vol.17/THE DESCENTE AND ISHIMOTO MEMORIAL FOUNDATION FOR THE PROMOTION SPORTS SCIENCE