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Changes in plasma glucose concentrations (panel A), rates of carbohydrate (CHO) oxidation (panel B) and muscle glycogen concentrations (panel C) during prolonged exercise when subjects ingested either placebo or 100 g of carbohydrate every hour during exercise. Subjects began the trial after a 16 h fasting period. Adapted with permission from ref. [49]. Copy-right 1986 American Physiological Society.
