Krog, K. N., Casa, D. J., Fiala, K. A., Roti, M. W., Hile, A. M., Armstrong, L. E., & Maresh, C. M. (2003). Effect of creatine monohydrate supplementation on perceptual responses to exercise in the heat while dehydrated. Medicine and Science in Sports and Exercise, 35(5), Supplement abstract 1209.

Trained athletes (N = 12) were supplemented with 21.6 gm/day of creatine monohydrate or a placebo for 10 days. On Day 7, Ss performed two hours submaximal exercise (30 minutes walking alternating with 30 minutes of cycling) in hot conditions, which resulted in dehydration. An 80-minute heat tolerance test was then performed involving walking and running.

No differences between conditions were found in ratings of perceived exertion, thirst, or thermal responses.

Implication. Creatine does not affect perceptual responses when exercising in the heat.

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