Which of the following are signs of dehydration in athletes?

The signs of dehydration in athletes include thirst, dark urine, fatigue, and dizziness because these symptoms directly indicate that the body is not receiving enough fluids to function optimally. Thirst is a fundamental biological signal that prompts an individual to drink water, indicating a need for hydration. Dark urine is a reliable indicator of dehydration; as the body becomes dehydrated, urine concentration increases, leading to darker coloring. Fatigue often sets in when the body is deprived of necessary hydration, as dehydration can lead to decreased physical performance, while dizziness can result from low blood volume and subsequent drops in blood pressure. Recognizing these signs is critical for athletes to maintain performance and overall health, making them key indicators of dehydration's impact on the body.