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Effect of Low- and High-Glycemic-Index Meals on Metabolism and Performance During High-Intensity, Intermittent Exercise
How low- and high-sugar meals affect metabolism and performance during intense, stop-and-go exercise
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Abstract
Consuming either low- or high-glycemic-index meals before high-intensity intermittent exercise can improve performance.
- Serum free fatty acids were higher and insulin lower during exercise in the fasted condition compared to meal conditions.
- Distance covered on a repeated-sprint test was significantly greater after consuming low-GI and high-GI meals compared to fasting.
- Perceived exertion was lower in the low-GI condition than in the fasted control.
- Muscle glycogen availability was greater in both meal conditions versus the fasted control before the repeated-sprint test.
- No differences were observed in blood glucose levels or substrate oxidation markers between low-GI and high-GI meal conditions.
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