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Effects of glucose ingestion or glucose infusion on fuel substrate kinetics during prolonged exercise
How Eating or Infusing Glucose Affects Fuel Use During Long Exercise
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Abstract
Glucose ingestion significantly increased plasma insulin concentrations to 12.9 mU.l-1 compared to 4.8 mU.l-1 with glucose infusion.
- Total rates of plasma glucose oxidation were higher with carbohydrate ingestion (9.5 mmol.125 min-1 kg FFM-1) compared to glucose infusion (6.2 mmol.125 min-1 kg FFM-1).
- Carbohydrate oxidation rates also increased with ingestion, reaching 37.2 mmol.125 min-1 kg FFM-1 versus 24.1 mmol.125 min-1 kg FFM-1 with infusion.
- Fat oxidation contributed more to energy production during glucose infusion (51%) than with carbohydrate ingestion (18%).
- Both methods maintained similar plasma glucose concentrations, with ingestion at 5.3 mmol.l-1 and infusion at 5.0 mmol.l-1.
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