What is a significant risk for athletes competing in high temperatures?

Athletes competing in high temperatures face a significant risk of dehydration and hyperthermia. Dehydration occurs when the body loses more fluids than it takes in, which can be exacerbated in hot conditions due to increased sweating as the body attempts to regulate its temperature. Symptoms of dehydration can include dizziness, fatigue, and decreased endurance, which directly impact performance and safety.

Hyperthermia refers to a condition where the body temperature rises to dangerously high levels, which can lead to heat exhaustion or heat stroke. This is a critical condition that can result in serious health consequences, including organ failure or even death, if not addressed promptly. Maintaining hydration and cooling the body effectively is crucial for athletes to avoid these potentially life-threatening conditions while competing or training in the heat.

The other options present risks that are not directly tied to high-temperature environments. For instance, hypothermia is related to cold conditions, muscle strains and joint injuries can occur in various scenarios but are not exclusive to high temperatures, and increased carbohydrate storage is generally beneficial rather than a risk during high temperatures.