Which of the following is a potential cause of long-term fatigue due to exhaustive exercise?

A potential cause of long-term fatigue due to exhaustive exercise is the depletion of glycogen levels. Glycogen serves as the primary energy source during prolonged physical activity, particularly in high-intensity exercise. When glycogen stores in the muscles and liver become significantly depleted, the body struggles to maintain optimal energy output. This depletion results in diminished performance, reduced endurance, and an overall increase in feelings of fatigue.

As glycogen levels drop, the body has to rely more on fat oxidation for energy, which is less efficient and can lead to earlier onset of fatigue. This is particularly notable in endurance athletes who often experience "hitting the wall," where they can no longer sustain their performance due to low glycogen availability. Proper carbohydrate intake before and during extensive exercise is crucial to help maintain glycogen levels and delay fatigue.

In contrast, reduced sleep quality and increased hydration of muscles do not directly lead to long-term fatigue due to exhaustive exercise. While poor sleep can affect recovery and performance, it is not as immediate a cause of fatigue in relation to exercise. Increased muscle hydration is beneficial as it aids in performance as it helps with muscle function and recovery. Excessive aerobic capacity might contribute to fatigue if someone is pushing their limits habitually, but it