Carbohydrate Feeding during Exercise

Exogenous glucose infusion at rates exceeding 1 gram/min is required to maintain blood glucose levels during prolonged exercise.

• Muscle glycogen utilization shifts to blood glucose oxidation as exercise duration increases.
• Carbohydrate consumption can delay fatigue by 30-60 minutes in endurance-trained individuals.
• Maintaining blood glucose at 5 mM requires intravenous glucose infusion at 16 mg/kg/min.
• To sustain blood glucose at 10 mM after 2 hours of exercise, a glucose infusion of 37 mg/kg/min is necessary.
• Carbohydrate supplementation does not reduce muscle glycogen use during intense exercise.
• Muscle glycogen and blood glucose may equally contribute to carbohydrate oxidation over 2-4 hours of exercise.

AI simplified