Intense workouts in heat have a role in both dehydration rates and cognitive function such as hand-eye coordination and concentration. Dehydration rates in the heat have a smaller safety net than an activity performed in 40-degree weather.
Dehydration increases exercising core body temperature, and when exercising in the heat, dehydration will lead to a greater core body temperature than when hydrated. Exercise in the heat has the potential to limit exercise performance due to the cardiovascular, thermoregulatory, metabolic, and neuromuscular changes that occur in the body.