Exogenous carbohydrate oxidation rates are elevated after combined ingestion of glucose and fructose during exercise in the heat

Exogenous carbohydrate oxidation rates were approximately 36% higher with a glucose and fructose beverage compared to glucose alone during exercise in the heat.

• Ingestion of a glucose and fructose beverage increased exogenous carbohydrate oxidation rates to 1.14 g/min compared to 0.77 g/min for glucose alone.
• Fluid availability was higher when consuming the glucose and fructose beverage compared to glucose.
• Endogenous carbohydrate oxidation was significantly lower with the glucose and fructose beverage compared to water.
• Muscle glycogen oxidation rates did not differ between glucose and water ingestion.
• Plasma deuterium levels were higher in water and the glucose and fructose beverage compared to glucose.

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