The purpose of this study was to investigate the effects of creatine (Cr) supplementation on performance during prolonged intermittent exercise in a hot environment. Twelve collegiate football players performed prolonged intermittent exercise in the heat environment (room temperature : 32.0±0.2℃, relative humidity : 58.5±1.4%) before and after 5 days of Cr (Cr 20g/day, Cr group : n=6) or placebo supplementation (Lactose 20g/day, Pla group : n=6). As a results, both supplementation didn't change body weight. And there were no differences in heart rate, weight loss, and blood lactate concentration during exercise between both groups. However, in the Cr group, rectal temperature during intermittent were decreased at the set of 5, 10, 15, 20, 25, and mean power output was significantly increased (pre; 741.5±77.2 vs post; 763.6±78.8 watt, p<0.01). In conclusion, Cr supplementation improves power output and thermoregulatory response during prolonged intermittent exercise in the heat environment.

DESCENTE SPORTS SCIENCE Vol.27/THE DESCENTE AND ISHIMOTO MEMORIAL FOUNDATION FOR THE PROMOTION SPORTS SCIENCE