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Source: Journal of Applied Physiology
Summary:
Trained cyclists cycled for 2 hours at 70% maximum, followed by a
performance ride, after eating high or
low glycemic index meals as randomly assigned.
The cyclists were given glucose throughout the trial
Despite differences in blood glucose, free fatty acids, and insulin
before the trial, carbohydrate oxidation during exercise was the same
Conclusion:
When carbohydrate is ingested during exercise, pre-exercise
carbohydrate has little effect on metabolism or performance.
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