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Fuel substrate kinetics of carbohydrate loading differs from that of carbohydrate ingestion during prolonged exercise
How the body uses energy from carbohydrate loading differs from regular carbohydrate intake during long exercise
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Abstract
Muscle glycogen levels were 194 +/- 4 mmol/kg in carbohydrate-loaded cyclists and 124 +/- 8 mmol/kg in those who ingested a carbohydrate drink without prior loading.
- Total carbohydrate oxidation was similar between both groups during exercise.
- Cyclists who ingested the carbohydrate drink showed higher rates of glucose appearance and oxidation compared to those who were carbohydrate-loaded.
- Endogenous glucose appearance and oxidation were significantly lower in cyclists without prior carbohydrate loading.
- Muscle glycogen levels decreased at the same rate in the first hour for both groups but declined more rapidly in those without carbohydrate loading thereafter.
- Carbohydrate loading before exercise may reduce the contribution of plasma glucose oxidation to overall carbohydrate oxidation while prolonging time to exhaustion.
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