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Substrate oxidation during exercise in the heat. A. represents carbohydrate oxidation for 1 hr in the heat with gas measurements made at 4, 24, and 54 min. B. represents fat oxidation for 1 hr in the heat with gas measurements made at 4, 24, and 54 min. Open and solid symbols represent the P and CHO trials respectively. * - indicates a significant main effect of time.
