Coggan, A. R., & Coyle, E. F. (1989). Metabolism and performance following carbohydrate ingestion late in exercise. Medicine and Science in Sports and Exercise, 21, 59-65.

Trained male cyclists (N = 6) performed two fatigue tests pedaling at 70% VO2max. After 135 min, Ss were fed either a placebo or glucose polymers (CHO: 3 gm/kg in a 50% solution) in each trial.

Exercise time to fatigue was increased by 21% and the respiratory exchange ratio restored in the CHO group. A single CHO feeding late in an extended exercise supplied sufficient CHO to restore euglycemia and increase CHO oxidation, thereby delaying fatigue.

Implication. In extended exercise in males, in the second half and latter stages of the performance, CHO ingestion is very important for it extends performance capabilities.

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