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During exercise at high temperatures, body temperature increases impairing exercise performance and resulting in heat illnesses. Water ingestion during exercise is a simple and practical strategy to prevent hyperthermia. In the present study, we examined the effects of water ingestion interval on thermoregulatory responses during exercise in a hot, humid environment (32t, 80% relative humidity). Eight male university students performed a 60-min cycling exercise (60% of the maximal 02 uptake) under four separate conditions; no drinking (ND), water ingestion (mineral water) at 5 (D5), 15 (D15), and 30 (D30) min intervals. The total volume of water ingestion (TWI) was identical during D5, D15, and D30, and equal to the amount of fluid lost in sweat during ND . TWI was divided equally by the number of drinking times in each experiment . During exercise, both rectal and mean skin temperature were lower in D5 than those in the other conditions (p<0.05). There was no significant difference in total sweat loss between the four conditions , however, evaporative sweat loss and sweat efficiency (evaporative sweat loss total sweat loss) were significantly (p<0.05) higher in D5 than those in the other conditions. These results suggest that the shorter water ingestion interval increases evaporative sweating and attenuates higher body temperature during exercise in a hot, humid environment . (Jpn. J. Phys. Fitness Sports Med. 2002, 51 : 317•`324) key word : body temperature, evaporative sweat loss, water ingestion, prolonged exercise

EFFECTS OF WATER INGESTION INTERVAL ON THERMOREGULATORY RESPONSES DURING EXERCISE IN A HOT, HUMID ENVIRONMENT