ABSTRACT
In contrast to the large range of temperatures found in the global environment (−90°C to +60°C), the human body is regulated within a very narrow range normally between 35°C and 40°C. The accurate regulation of internal temperature is necessary to maintain normal body function. During exercise metabolic rate is elevated above resting levels by as much as 15 times to provide the necessary energy for muscle contractions (Reilly, 1996; Sawka and Wenger, 1988). This increase in metabolism produces heat within the active muscles, which must be dispersed to the environment in order to maintain core temperature within healthy limits.
