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Ingesting Isomaltulose Versus Fructose-Maltodextrin During Prolonged Moderate-Heavy Exercise Increases Fat Oxidation but Impairs Gastrointestinal Comfort and Cycling Performance
Using Isomaltulose Instead of Fructose-Maltodextrin During Long Moderate-to-Heavy Exercise May Increase Fat Burning but Cause Stomach Discomfort and Lower Cycling Performance
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Abstract
Ingesting 63 g·h-1 of isomaltulose during exercise is associated with 1.5 minutes slower performance in a 16 km time trial compared to fructose-maltodextrin.
- Isomaltulose increases plasma nonesterified fatty acid concentration and fat oxidation while decreasing carbohydrate oxidation during steady-state exercise.
- Both isomaltulose and fructose-maltodextrin elevate blood glucose levels similarly, despite differing metabolic responses.
- Gastrointestinal symptoms, such as stomach cramps and bloating, significantly increase with isomaltulose intake during exercise.
- The metabolic response to isomaltulose ingestion during moderate exercise is unusual for a carbohydrate supplement.
- Isomaltulose negatively affects exercise performance when compared to fructose-maltodextrin supplementation.
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