What are common signs of dehydration during exercise?

The correct answer highlights the common signs of dehydration during exercise, which predominantly include feelings of thirst and a dry mouth. When the body loses fluids through sweat or respiration during physical activity, it signals a need for hydration. This thirst mechanism is a physiological response aimed at encouraging fluid intake to restore the body’s balance.

Dry mouth is another direct manifestation of dehydration, as the saliva production decreases with insufficient fluid levels, leading to discomfort and a strong sensation that prompts the individual to drink. Recognizing these signs is critical for athletes and individuals engaging in prolonged physical activity to prevent further dehydration, which can impair performance and lead to more severe health issues.

Other options, while related to fitness and hydration, do not accurately represent the primary signs of dehydration. Increased appetite may occur for various reasons unrelated to hydration levels, while an increased heart rate can be a response to many factors during exercise, not solely dehydration. Finally, improved performance contradicts the effects of dehydration, which generally results in reduced physical capacity rather than enhancement. Understanding these signs helps in maintaining optimal hydration and performance during exercise.