Impact of Caffeine and Protein on Postexercise Muscle Glycogen Synthesis

Muscle glycogen synthesis rates averaged 31 ± 4 mmol·kg⁻¹ dry weight·h⁻¹ for carbohydrate alone, carbohydrate plus protein, and carbohydrate plus caffeine.

• The plasma insulin response was higher with carbohydrate plus protein compared to carbohydrate alone and carbohydrate plus caffeine.
• Plasma glucose responses and glucose appearance rates did not show differences among the three conditions.
• Muscle glycogen synthesis rates did not differ significantly between carbohydrate, carbohydrate plus protein, and carbohydrate plus caffeine.
• Histochemical analyses revealed no differences in Type I and Type II muscle fiber glycogen content across the experiments.

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