What is a common sign of dehydration during exercise?

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A common sign of dehydration during exercise is dark yellow urine or decreased urine output. When the body is adequately hydrated, urine tends to be light in color and is produced in larger quantities. However, as dehydration begins, the kidneys conserve water to maintain balance, resulting in darker urine, which indicates higher concentrations of waste products and a reduced capacity for fluid excretion.

Dark yellow urine often signifies that the body is not receiving enough fluids, especially when engaging in physical activity, which can exacerbate fluid loss through sweat. Therefore, recognizing dark yellow urine or reduced urine output during exercise can serve as an important indicator that an individual needs to hydrate properly to maintain performance and prevent health risks. Frequent thirst and a dry mouth can also signal dehydration, but they may not be as definitive as changes in urine color or volume, which provide a clearer physiological response to fluid loss.

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