Sweating

The production of sweat cools the skin through evaporation. The minimum insensible perspiration per day is 0.5 litre. Maximum daily secretion is 10 litres, with a maximum output of about 2 litres per hour. Men sweat more than women.

Watery isotonic sweat, produced in the sweat gland, is modified in the excretory portion of the duct so that the fluid delivered to the skin surface has:
• a pH of between 4 and 6.8
• a low concentration of Na + (30-70 mEq/1) and Cl (30-70 mEq/1)
• a high concentration of K* (up to 5 mEq/1), lactate (4-40 mEq/1), urea, ammonia and some amino acids. Only small quantities of toxic substances are lost.

Sweating may also occur in response to emotion and after eating spicy food. In addition to thermoregulation, sweat also helps to maintain the hydration of the horny layer and improves grip on the palms and soles.

comparing sweat production patterns in different seasons of the year among young and old males has shown that older skin has a decreased ability to maintain body temperature with passive heating of the extremities. However, regional dif- ferences exist in this age-related decrease of sweating. For instance, regional sweating rates were signi? cantly lower on the thigh for older men but not much difference existed between the age groups when it came to sweating rates on the back.



	Sweating The production of sweat cools the skin through evaporation. The minimum insensible perspiration per day is 0.5 litre. Maximum daily secretion is 10 litres, with a maximum output of about 2 litres per hour. Men sweat more than women. Watery isotonic sweat, produced in the sweat gland, is modified in the excretory portion of the duct so that the fluid delivered to the skin surface has: • a pH of between 4 and 6.8 • a low concentration of Na + (30-70 mEq/1) and Cl (30-70 mEq/1) • a high concentration of K* (up to 5 mEq/1), lactate (4-40 mEq/1), urea, ammonia and some amino acids. Only small quantities of toxic substances are lost. Sweating may also occur in response to emotion and after eating spicy food. In addition to thermoregulation, sweat also helps to maintain the hydration of the horny layer and improves grip on the palms and soles.	comparing sweat production patterns in different seasons of the year among young and old males has shown that older skin has a decreased ability to maintain body temperature with passive heating of the extremities. However, regional dif- ferences exist in this age-related decrease of sweating. For instance, regional sweating rates were signi? cantly lower on the thigh for older men but not much difference existed between the age groups when it came to sweating rates on the back.
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