How drinking a carbohydrate-electrolyte drink during running affects muscle energy use in fed people

Muscle glycogen use during the first hour of running is not influenced by a carbohydrate-electrolyte solution consumed during exercise.

• Eight men completed two 60-minute treadmill runs at 70% VO(2)max after consuming a carbohydrate meal 3 hours prior.
• Higher serum insulin concentrations were observed at the start of exercise compared to fasting levels in both trials.
• Blood glucose concentrations were significantly higher after 60 minutes in the trial with the carbohydrate-electrolyte solution.
• Pre-exercise muscle glycogen concentrations were similar in both trials, with values of 321.9 and 338.8 mmol per kg of dry weight.
• No significant difference in glycogen usage during exercise was found between the two trials.

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