Ace the 2026 CSCS Scientific Foundations Exam – Power Up Your Fitness Knowledge!

Maintaining adequate glycogen stores is crucial for athletes primarily because it spares the use of protein for energy. Glycogen, which is stored in the liver and muscles, serves as a readily available source of energy during physical activity. When glycogen stores are sufficient, the body relies primarily on these carbohydrate reserves for fuel, allowing protein to be preserved for its essential roles in muscle repair, recovery, and other metabolic functions.

When glycogen stores are depleted, especially during prolonged or intense exercise, the body may start to break down amino acids from protein to meet its energy demands. This process can negatively impact muscle mass and performance, leading to fatigue and diminishing strength. Ensuring that glycogen stores are replenished through appropriate dietary intake allows athletes to maintain their performance levels and reduces the risk of muscle breakdown.

The other options, while relevant to athletic performance in general, do not directly relate to the importance of glycogen stores.