Acclimatization

Through acclimatization, the body adapts to a more efficient response to intense heat exposure. Acclimatization results from repeated bouts of moderate exercise in a hot environment. During acclimatization, physiologic changes occur that result in sweating at lower temperatures, a higher sweat rate, an increase in peripheral blood flow, and a decreased sodium chloride concentration in sweat and urine, due to increased aldosterone secretion. The end result of these physiologic changes includes a decreased heart rate, a decreased core body temperature, increased plasma volume, increased exercise tolerance time, and decreased perceived exertion.78 Acclimatization requires repeated exposures to heat: usually 1 to 4 h/day for 14 days. The results of acclimatization are transient and are lost if heat exposure does not continue.

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