摘要:A high number of competitions, as well as many training hours spent in an environment characterized by hot temperatures, require athletes performing various sports to have adapted extensively to heat. Metabolic energy produced during physical activity is used against entropy, while excess energy is released from the body as heat. Body temperature is controlled by thermoregulatory mechanisms. The human body can remain at an optimal level of performance as long as the core temperature is maintained within limits of ±0.5°C. The athlete's body is exposed to additional metabolic heat because of physical activity, and also to additional heat coming from external sources. This paper deals with the following topics: (1) the specific heat adaptation process undergone by athletes practicing their sport in hot environments, and (2) prevention and treatment of heat illness and heat stroke, which could not only compromise performance, but may also endanger the athletes' health and, in some instances, be life threatening.