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Source: Medicine & Science in Sports & Exercise
Summary:
Subjects ingested carbohydrate or carb plus protein beverage while cycling
Subjects were able to cycle 40% longer with carb plus protein
There were no significant differences in heart rate, perceived exertion, or blood lactate levels
Conclusion: Carb and protein improved time to fatigue but it is not clear if this was due to extra calories or specifically to protein
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