What is the primary function of carbohydrates in athletic performance?

Carbohydrates are essential for athletic performance because they serve as the primary energy source during physical activity. When engaging in exercise, especially high-intensity activities, the body relies heavily on glucose, which is derived from carbohydrates. This quick source of energy is crucial for maintaining performance, as it helps fuel muscle contractions and sustain endurance during workouts or competitions.

During exercise, the body metabolizes carbohydrates either from stored glycogen in the muscles and liver or from recent dietary sources. When participating in prolonged or intense workouts, having adequate carbohydrate stores can significantly enhance performance by delaying fatigue and improving overall endurance. Without sufficient carbohydrates, athletes may experience diminished energy levels, resulting in decreased performance.

The other options focus on areas that, while important in the context of physical fitness, do not align with the primary role of carbohydrates. Promoting muscle growth is primarily associated with protein intake, while providing strength is more linked to resistance training and neuromuscular adaptations. Flexibility is generally enhanced through stretching and mobility exercises, rather than carbohydrate intake. Thus, the primary function of carbohydrates, especially in the context of athletic performance, is their role as a quick and efficient source of energy during exercise.