What is an appropriate first step in treating an athlete affected by dehydration?

The appropriate first step in treating an athlete affected by dehydration is to repack fluids and ensure rest in a cool environment. This action is crucial because replenishing lost fluids is essential to restoring hydration levels, which helps to maintain normal physiological functions. Additionally, providing a cool environment can help reduce the body temperature and mitigate the symptoms of heat-related illnesses that often accompany dehydration.

Fluids, such as water or sports drinks with electrolytes, are necessary to restore hydration and balance, which can be disrupted during dehydration. Ensuring that the athlete rests is also important, as continuing to exert themselves can exacerbate the dehydration and lead to further complications.

Other options, such as applying ice packs to major muscle groups, may provide temporary relief for muscle soreness but do not address the underlying issue of dehydration. Administering electrolyte supplements only might not be sufficient without adequate fluid intake, as the body also requires water to effectively manage electrolyte balance. Encouraging strenuous exercise to regain strength is counterproductive in the context of dehydration, as it would increase the risk of heat exhaustion, cramping, or heatstroke.