What is the main adverse effect of dehydration on exercise performance?

Dehydration has a significant adverse effect on exercise performance, primarily manifesting as decreased stamina. When an individual becomes dehydrated, their body loses fluids that are essential for maintaining optimal physiological function during physical activity. This loss of fluids can lead to a decline in blood volume, which adversely impacts cardiovascular efficiency. As the heart has to work harder to pump less blood, it can lead to increased fatigue and an overall reduction in performance.

Additionally, dehydration can impair thermoregulation, leading to increased body temperature and a further decline in endurance capacity. With diminished stamina, athletes may experience early onset of fatigue, reduced exercise intensity, and an inability to sustain prolonged efforts. Therefore, maintaining proper hydration is crucial for supporting endurance and optimizing exercise performance.