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Content: With "training" sweat glands produce more sweat. -blood volume increases and more blood is diverted to the skin (may even get a "red" face)
-behavioral changes occur: less clothing is worn, or heat is avoided e.g. resorting to an air-conditioned room (an example of getting used to not getting used to it because such behavior does not produce physiological acclimatization). Heat acclimatization is best achieved by actually doing work in hot climates e.g. exercise. The best results occur when exposure lasts for at least one hour or at least every other or every day for at least 2 to 3 weeks (some acclimatization occurs within 4-7 days, and reasonably in 12-14 days). Discontinuation of heat exposure results in reversion to the unacclimatized state in a few weeks. Booster exposures every week or so can maintain a high level of acclimatization. This process has been confirmed by experimental studies e.g. Lind & Bass, 1963. Lind  & Bass (1963) - Men worked each of 9 days for 100 minutes at a time at an energy expenditure of 300 kcal hr-1 in a hot climate. Core temperature and pulse rate decreased and sweat rate increased with acclimatization.