The present study consists of following two experiments. 1) T confirm whether brain temperature is selectively cooled during hyperthermia, we studied 8 subjects using measurements of tympanic temperature (Tty). Hyperthermia was induced by leg water-immersion at a water temperature of 42℃, in a climatic chamber at an ambient temperature (Ta) of 35℃. When facial fanning at a wind velocity of 5.5m・sec⁻¹ was applied during hyperthermia, forehead skin temperature (FTsk) and Tty were 2℃ and 0.1℃ lower than those without facial farming. Subjects voted low rates of thermal sensation on the face (TS) with facial fanning. Facial fanning improved significantly hand-grip exercise performance (37%). 2) To investigate whether makeup hinders selective brain cooling during hyperthermia, we studied 7 subjects using head-out sauna (44℃) at a Ta of 25℃. Makeup significantly decreased forehead skin blood flow (31%) and FTsk (0.5℃). Subjects voted high TS with makeup.
　These results suggest that enhanced heat loss from the head and face induces selective cooling of the brain during hyperthermia, and hence improves exercise performance. From the standpoint of prevention of heat stroke, we advise that athletes should use face and head fanning after stop of exercise and should not exercise with makeup.

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