What role does carbohydrate intake play in exercise performance?

Carbohydrate intake plays a crucial role in exercise performance primarily by supporting muscle glycogen resynthesis. During physical activity, particularly in endurance sports, the body relies heavily on glycogen, which is stored in the muscles and liver, as a primary energy source. When carbohydrates are consumed, they are broken down into glucose and either used for immediate energy or converted into glycogen for future use. Adequate carbohydrate intake post-exercise is especially important as it replenishes the glycogen stores that are depleted during prolonged or intense workouts, thereby preparing the body for subsequent training sessions and improving overall exercise performance.

This resynthesis of glycogen is vital because depleted glycogen stores can lead to fatigue and reduced performance in subsequent workouts or competitions. Therefore, a diet that includes sufficient carbohydrates is essential for athletes looking to maintain optimal energy levels, enhance recovery, and sustain their training intensity.

The other options do not capture the primary function of carbohydrates in the context of exercise performance as directly as muscle glycogen resynthesis does.