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http://www.ncbi.nlm.nih.gov/pubmed/3203673
Beards, baldness, and sweat secretion.
Abstract
The hypothesis according to which male common baldness has developed in the human species as a compensation for the growth of a beard in order to achieve heat loss has been tested. In 100 clean-shaven men direct measurement of the area of glabrous skin on the forehead and calvaria was found to be proportional to that of the hairy skin on the lips, cheeks, chin and neck. During light hyperthermia the evaporation rate on the bald scalp was 2 to 3 times higher than on the hairy scalp. Conversely the evaporation rate was practically equal on the foreheads and chins of women and unbearded young men, while in adult clean-shaven bearded men it was 40% less on the chin than the forehead. These results support the hypothesis that male baldness is a thermoregulatory compensation for the growth of a beard in adults.
http://www.ncbi.nlm.nih.gov/pubmed/6437615
[Is baldness a thermoregulatory adaptive process?].
Abstract
In 100 adult men the area of the face and neck where beard was growing was measured and compared to that of glabrous skin on the forehead and calvaria. In the population as a whole, forehead area was found to be proportional to bearded area. Forehead and calvaria sweat rate was measured on 10 baldheaded male subjects and compared with that of 10 hairy control subjects during mild hyperthermia. Bald skin was found to sweat more than twice as much as hairy skin. In the light of these results the hypothesis that baldness is a thermoregulatory adaptative process is proposed.
http://www.ncbi.nlm.nih.gov/pubmed/3203673
Beards, baldness, and sweat secretion.
Abstract
The hypothesis according to which male common baldness has developed in the human species as a compensation for the growth of a beard in order to achieve heat loss has been tested. In 100 clean-shaven men direct measurement of the area of glabrous skin on the forehead and calvaria was found to be proportional to that of the hairy skin on the lips, cheeks, chin and neck. During light hyperthermia the evaporation rate on the bald scalp was 2 to 3 times higher than on the hairy scalp. Conversely the evaporation rate was practically equal on the foreheads and chins of women and unbearded young men, while in adult clean-shaven bearded men it was 40% less on the chin than the forehead. These results support the hypothesis that male baldness is a thermoregulatory compensation for the growth of a beard in adults.
http://www.ncbi.nlm.nih.gov/pubmed/6437615
[Is baldness a thermoregulatory adaptive process?].
Abstract
In 100 adult men the area of the face and neck where beard was growing was measured and compared to that of glabrous skin on the forehead and calvaria. In the population as a whole, forehead area was found to be proportional to bearded area. Forehead and calvaria sweat rate was measured on 10 baldheaded male subjects and compared with that of 10 hairy control subjects during mild hyperthermia. Bald skin was found to sweat more than twice as much as hairy skin. In the light of these results the hypothesis that baldness is a thermoregulatory adaptative process is proposed.