An individual who is heat acclimated may perspire almost twice as much as an unacclimated individual. As we have already mentioned, perspiration and evaporation of perspiration, is the primary means for the body to cool during exercise. Skin blood flow increases significantly during exercise. Blood flowing near the surface results in cooling by both conduction and convection. There appears to be a 25 to 40 percent lower increase in Skin Blood Flow, however, in the older athlete.
Sweat glands become active as body core temperature rises.
One liter of sweat is generated during the expenditure of about 500 kcal. Studies have shown that training increases both sweating and skin blood flow. An individual who is heat acclimated may perspire almost twice as much as an unacclimatized individual. One of the effects of acclimatization is to allow an individual to begin perspiration earlier in the course of exercise, this allows for a quick, effective and efficient beginning to heat dissipation and alleviation of early heat buildup. Each gram of perspiration that evaporates cools the body by 0.6 kcal.