The Growth Cycle of Hair
Anagen is the growth phase of the hair. The hair in this stage grows rapidly at about 0.4 mm per day, 1 cm every 28 days. Scalp hair stays in this active phase of growth for two to six years.
Catagen is the transitional phase. About 3% of all hairs are in this phase at one time. The Catagen phase begins when growth finally stops, the hair is then released from the follicle, and is no longer attached at the root at the end of this stage. The detached hair in the follicle is called a "Club Hair".
Telogen is the resting phase and accounts for 6% to 8% of all hairs. This phase is essentially the shedding of the club hairs, and it lasts for different lengths of time on different parts of the body. On the head, this phase is about 100 days long. About 75 Telogen hairs are shed in a normal person each day.
Some people have trouble growing their hair long, and this phenomenon is genetic. Certain individuals have hair that spends more time in the Telogen phase and less time in the Anagen phase. To this extreme, arm and eyelash hair only grow to a very short length because their locations are programmed to provide a very short Anagen phase. These genetically determined differences between people are inalterable.
In the Anagen phase, quite interestingly, the same follicle planted on different parts of the body will grow to different lengths, showing that the growth cycle differs depending on where on the body the hair is growing. I have used chest hairs in various repair cases, transplanting these one-inch hairs onto the head. Amazingly, these hairs can grow up to three or four inches when planted on the head.
Developing a Mature Hairline
As males grow and mature from childhood through to adulthood, they experience a normal change in the hairline that is not a symptom of Male Pattern Baldness. At least once a week, I see a male in his early 20s who is convinced that he is losing all his hair. His hairline has receded about half an inch in the previous five years, and is slightly thinner than it was. As well, temporal angles have receded slightly. This change is part of the normal maturation process - it happens in every testosterone-producing male, and is not a sign that further balding will take place.
Related Tags: hair, hair care, hair transplant, hair restoration, transplant hair, hair replacement therapy
Dr. Robert Jones is a hair transplant surgeon just west of Toronto, Ontario, Canada. His practice is restricted to full time hair restoration surgery. He is president of the International Society of follicular Unit Surgeons, a member of the Internation Society of Hair Restoration Surgeons, and Board Certified by the American Society of Hair Restoration Surgeons. For pictures showing the progress of his transplant please go to his site at www.torontohairdoctor.com. Dr. Jones has just completed a book "Dr. Robert Jones's complete Hair Loss Guide" with his son, which can be ordered through his site in January of 2007.
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