Caffeine Refuels Muscles After Exhausting Workout

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According to a study in the Journal of Applied Physiology , co-ingestion of large amounts of caffeine with carbohydrates after an exhausting workout rapidly replenishes glycogen, the muscle's primary fuel source. The study, conducted by researchers in Australia, looked at subjects who completed a cycling workout followed by a low-carb diet. The next morning they were asked to complete the workout again, but this time subjects either followed the workout with more carbohydrates or carbs plus caffeine. Subjects who ingested caffeine after the workout had 66% more glycogen in their muscles four hours later.