Hair regeneration

Hair follicle regeneration after plucking

I found the following information courtesy of www.keratin.com . The site 
does have an impressive bibilography, although the specific reference for 
this information was not identified. I have reformatted information from the 
table into a more text-friendy layout. Please check out this website for 
more information on hair biology.  (by Mike Grant)

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Hair follicle regeneration after plucking by body region 

Below is a brief table showing the number of days it took 
for a hair follicle from which a hair was plucked to 
regenerate a new hair fiber. 

Regeneration rate (days):

Scalp hair :
Pre-puberty: 134
Adolesecent/young adult: 130
Mature adult: 112 
Retirement age: 139

Eyebrow:
Pre-puberty: 58
Adolescent/young adult: 65
Mature adult: 56
Retirement age: 73

Thigh hair :
Pre puberty 77 
Adolescent/young adult 88 
Mature adult 141 
Retirement age 240 


The average number of days required for regeneration of hairs 
in 90% of the follicles from which hairs were plucked was 129 
in the crown of the scalp, 123 in the under arm, 121 in the thigh,
92 in the chin, and 64 in the eyebrow. Hairs of the scalp regenerate
more quickly for males than females, but hairs of the under arm, 
and thigh regenerate more quickly in females than males. Regions
in which hairs are long and grow at the fastest rate require the 
longest interval for regeneration. 

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