What is a common indicator of poor hydration during exercise?

Decreased urine output is a common indicator of poor hydration during exercise. When an individual is well-hydrated, their body functions optimally, and the kidneys filter out waste efficiently, leading to regular urine production. However, when hydration levels decline, the body prioritizes conserving water, which results in decreased urine output. This physiological response reflects the body’s attempt to maintain electrolyte and fluid balance in the absence of adequate hydration.

In contrast, increased energy levels, enhanced muscle performance, and improved mood are typically associated with proper hydration. These factors reflect the positive effects of adequate fluid intake on physical and mental performance rather than signaling dehydration. Therefore, the presence of decreased urine output serves as a critical indicator prompting the need for fluid replenishment to support health and performance during exercise.