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Figure 2.5: Changes in sweat rate and average rectal temperature between an acclimatized and an unacclimatized person

This graph illustrates an increase in sweat rate with an increase in average rectal temperature in degrees Farenheit over a four hour period in humans, starting with a base sweat rate of 0. Beginning with no sweat production at a rectal temperature of 97.5 degrees Farenheit, an acclimatized person can increase their sweat rate to 3.5 litres after four hours as their rectal temperature increases to 104 degrees Farenheit. An unacclimatized person can reach the same rectal temperature and only increases their sweat rate to 2.1 litres after four hours. The increase in sweat rate for an acclimatized person at all rectal temperatures is consistently above that of an unacclimatized person for the four hour period, beginning at 98 degrees Farenheit.