Boy Scouts of America (BSA) Lifeguard Practice Test

The signs of dehydration in swimmers are commonly characterized by excessive thirst, dry mouth, fatigue, and dizziness. When a swimmer becomes dehydrated, their body lacks the necessary fluids to function properly, leading to a sensation of intense thirst as the body signals the need for hydration. A dry mouth is a physical manifestation of this lack of hydration, indicating that the body is not receiving adequate moisture.

Fatigue is another critical sign, as dehydration impacts physical performance and energy levels, making it difficult for swimmers to maintain their usual stamina during activities. Dizziness can occur as the body's balance and hydration levels are affected, leading to a decrease in overall blood volume and potentially causing a feeling of light-headedness or faintness.

In contrast to this correct option, excessive energy is not a symptom of dehydration; rather, the lack of fluids typically results in decreased energy levels. Bright skin and excessive sweating may suggest that a swimmer is active and healthy, but they do not specifically indicate dehydration. Frequent urination is generally a sign of adequate hydration rather than dehydration, and restlessness can be more closely related to anxiety or other factors, not a direct sign of dehydration in swimmers. Therefore, recognizing the specific combination of excessive thirst, dry mouth, fatigue, and dizziness is