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2001; 4 (2): 18-27. The current investigation evaluated body water changes and indicators of heat tolerance with 28 days of creatine (CR) or placebo (PLC) supplementation. Twenty college-aged males were assigned to receive creatine or placebo in a randomized double blind fashion. Body weight, body water, hematocrit, and body composition were measured before and after the treatment period. Additionally, heart rate and core temperature responses to 60 minutes of exercise in the heat (37 C, 25% RH) were assessed. The CR group had greater gains in total body water (p= 0.050) and body weight (p= 0.034) than the PLC group. The rise in core temperature during the cycle ride was attenuated by creatine supplementation in comparison to placebo consumption. Gains in total body water over the four weeks were related to the attenuation of temperature rise during the ride following supplementation (n= 19; r= 0.569, p= 0.011). No significant differences were detected for percent body fat, hematocrit values, or heart rate response to exercise. These results suggest that body weight gains with CR supplementation may partially reflect body water changes and may help attenuate the thermal burden associated with exercise in the heat.