</font><blockquote><font class="small">In reply to:</font><hr />
LondonDiva said:
It minimises the shedding and extends the phase (can't remember the name of the phase) that keeps the hair growing, before it enters the rest then shedding phase.
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I think the growth phase is called anagen, the transitional phase is called catagen, and the resting phase is called telogen. The following information may be more than you wanted to know /images/graemlins/blush.gif but I thought it might be helpful. /images/graemlins/tongue.gif
Approximately 85% of all hairs are in the growing phase at any one time (the anagen phase). The Anagen phase varies from two to six years, with hairs growing at a rate of about 6 in per year. At the end of the Anagen phase, the hair enters into a Catagen phase, which lasts about one or two weeks. During the Catagen phase, the hair follicle shrinks to about 1/6 of the normal length. The lower part is destroyed and the dermal papilla breaks away to rest below. [The dermal papilla is a highly active group of cells that can induce both follicle development from the epidermis (skin) and production of hair fiber.] The resting phase follows the catagen phase and normally lasts about 5-6 weeks. During this time the hair does not grow but stays attached to the follicle while the dermal papilla stays in a resting phase below. Approximately 10-15 percent of all hairs are in this phase at an one time.
At the end of the Telogen phase the hair follicle re-enters the Anagen phase. The dermal papilla and the base of the follicle join together again and a new hair begins to form. If the old hair has not already been shed the new hair pushes the old one out and the growth cycle starts all over again.
Each hair passes through the phases independent of the neighboring hairs. Hair is continually shed and renewed by the operation of alternating cycles of growth, rest, fallout, and renewed growth. The average life of different varieties of hair varies from about 4 months for downy hairs to 3 to 5 years for long scalp hairs. Each human follicle follows this cycle independently of others, so the total amount of hair normally remains constant, with an average shedding of 50 to 100 hairs per day lost from a total of around 150,000 follicles.
HTH /images/graemlins/smile.gif