To investigate the practical and effective local cooling method for preventions of heat disorder or lowering of exercise performance with exercise under the hot environment, a laboratory experiment and an investigation during the out-door sport (tennis game) were made.
　In the loboratory experiment, effects of 3 local coolings [back cooling (9℃), neck & forehead cooling 1 (19℃) and neck & forehead cooling 2 (9℃)] were compared during an intermittent bycycle ergometry exercise (HRmax 60%) at ambient temperatures of 35 and 30℃.
　The coolings were performed by cooling band. In the both environ-mental conditions, both temperature and comfort sensations were reduced by all local coolings in comparison with control condition (no-cooling), but physiological functions of heart rate and body temperature (rectum and tympanum) were only effective in the neck & forehead cooling 2.
　In a mearsurement during tennis game in out-door (ambient temperature of 34℃, WBGT of 30.7℃), body temperature (oral) and temperature & comfort sensations were compared between no-cooling group (control) and neck & forehead cooling (9℃) group. The both sensations were reduced by the cooling, but the oral temperature made a no different because the cooling temperature was not able to be kept 9℃ in the outside.
　These results indicate that effective local cooling method for physiological function is the cooling of neck and forehead less than 10℃. In the future, it is expected to be produced more practical and effective cooling gear, easily maintainable lower temperature for longer time.

DESCENTE SPORTS SCIENCE Vol.18/THE DESCENTE AND ISHIMOTO MEMORIAL FOUNDATION FOR THE PROMOTION SPORTS SCIENCE