Biology · Exercise Metabolism
During a 4-hour endurance athletic event, what is the primary shift in nutrient energy usage over time?
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 1Initial fat use shifting to 85% carbohydrate
- 2Constant 50-50 carbohydrate-fat split
- 3Initial carbohydrate use shifting to 60–85% fat✓
- 4Exclusive amino acid use initially
Correct answer
Initial carbohydrate use shifting to 60–85% fat
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