Effect of Fat‐ and Carbohydrate‐Rich Diets on Metabolism and Running Performance in Trained Adolescent Boys

Consumption of a carbohydrate-rich diet may enhance 10,000-m running performance in trained adolescent boys.

• During submaximal exercise, a fat-rich diet resulted in a lower carbohydrate contribution and a higher fat contribution to energy expenditure compared to a carbohydrate-rich diet.
• No significant differences in substrate oxidation rates were observed between the fat-rich and habitual diets.
• Running performance in the 10,000-m trial was similar after consuming fat-rich and habitual diets.
• A carbohydrate-rich diet improved performance in the 10,000-m run compared to a fat-rich diet.

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