Certified Personal Trainer (NSCA) Practice Exam 2025 – Complete Prep Guide

Thirst, dry mouth, fatigue, and dizziness are classic signs of dehydration during exercise. These symptoms arise because water is essential for maintaining bodily functions, including temperature regulation, hydration of cells, and overall physical performance.

When a person exercises, especially in hot or humid conditions, they lose fluids through sweat. As fluid levels decrease, the body's thirst signals activate, prompting an individual to drink more water. Dry mouth occurs because hydration levels drop, impacting saliva production. Fatigue can set in as dehydration negatively affects muscle function and energy levels, making physical activity feel more strenuous. Dizziness often signifies reduced blood flow and volume, which can occur when there is insufficient fluid in the body. This combination of symptoms can indicate the early stages of dehydration and calls for immediate attention to rehydrate.

The other choices could represent various effects of hydration status but are more specific or might not directly indicate dehydration as clearly as the chosen answer. Therefore, recognizing the combination of thirst, dry mouth, fatigue, and dizziness is crucial during exercise to mitigate the risks associated with dehydration.