How fast does leg hair grow: Do you have questions in your mind about your leg hair? Today we are going to answer all of your questions.
How fast does leg hair grow?
Hair Life Cycle
How fast does leg hair grow & why?
- Hair growth
- Hormonal factors
- Non-hormonal factors
Frequently Asked Question
- How many hairs do we have?
- Are the hairs alive?
- Is it true that hair is unique to each person?
- Are women’s hair thinner than men’s?
- Does hair grow faster at certain times of the year?
The hair originates from the hair follicle, which is located in the dermis. Each follicle is associated with a sebum-producing gland (sebaceous); follicle and gland form the pilo-sebaceous unit. The hair erector muscle is connected to the hair follicle, the contraction of which allows piloerection.
At the level of the pilo-sebaceous unit, there is a high expression of a particular type of enzyme: the 5-alpha-reductase type II. This enzyme converts testosterone into its active form, dihydrotestosterone, the main cause of hair loss in patients with androgenetic alopecia.
Hair Life Cycle
The extent and type of hair growth are genetically predetermined.
Hair growth is not continuous but cyclic: in fact the growth phase, called anagen, is followed by a rapid involution (catagenic phase), which in turn is followed by a period of quiescence (telegenic phase) hair growth. The length of the hair is mainly determined by the duration of the growth phase. The impression of continuous growth or periodic fall that the hairs in some body areas give is due to the degree of synchronicity in the growth existing between nearby hair follicles. Thus, on the scalp, where the growth is asynchronous, one has the impression of a continuous growth of hair, while in other areas, due to the synchrony between the different hair follicles, the hair simultaneously reaches the resting phase, giving the impression of falling.
How fast does leg hair grow & why?
Hair grows at an average speed of about 0.2-0.3 mm per day: this data explains why, when we talk about surface hair removal methods, such as hair removal, women experience slight roughness after a day or two when regrowth begins. The regrowth rate is determined by biological factors, it does not depend on nutrition, but may be influenced by some drugs.
The factors that control hair growth are governed by the dermal papilla, the disappearance of which is a crucial factor in hair loss. Factors capable of influencing hair growth can be substantially divided into two groups: hormonal and non-hormonal.
Among the various hairs, there are many that respond to the stimulation of steroid hormones (derived from cholesterol), including especially sexual ones; these are called sexual hair. They are located on the face, on the lower abdomen, on the front face of the thighs, on the chest, on the breasts, on the pubic area and on the armpits.
The pilo-sebaceous unit is regulated by the maturation of the hair follicle and its sensitivity to the action of androgens, due to the presence of specific receptors for these hormones.
The pilo-sebaceous system is particularly affected by the activity of androgens at the level of the skin because it has the enzyme 5-alpha-reductase type II, which has the ability to convert testosterone into dihydrotestosterone. In the shaggy woman, this conversion activity seems accelerated.
Testosterone is the most potent androgen and, in most shaggy women, the share of production of this hormone is exaggeratedly high, both because of an increase in its ovarian production, and because of an increase in ovarian and adrenal production of androstenedione (a precursor of testosterone , which is then converted into dihydrotestosterone by 5-alpha-reductase of the hair follicle).
Under normal conditions, in women, the structures responsible for the production of androgenic steroid hormones are the adrenal and the ovary. A further, but lower, share of androgens is also produced at the level of the pilo-sebaceous unit.
However, in most hirsutisms, the excess production of androgens is of ovarian origin.
As for female hormones, however, the discussion changes. In fact, estrogens have a completely opposite action on the hair follicle to that of androgens, because they delay the onset and extent of hair growth. The progestogens, on the other hand, have a completely negligible effect on the follicle.
Pregnancy, characterized by high estrogen levels and progesterone, can increase the synchrony of hair growth, leading to periods of increases and others of hair loss.
Numerous hormonal disorders can affect the growth of sexual hairs: the failure of ‘ pituitary (reduction of hair growth), the’ acromegaly (increased), and ‘hyperthyroidism (increased growth of hair armpit, pubic and outside of the eyebrow).
As mentioned, hair growth can also be influenced by factors independent of an individual’s hormone levels.
Among the non-hormonal factors that can affect hair growth we mention:
The temperature of the skin (growth is higher in summer than in winter);
The possible presence of edema (swelling) .
Frequently Asked Question
How many hairs do we have?
Our body is covered with an incredible amount of hair: two million. The woman on average has about 16,800 hairs on the legs and 600 in the armpits, while the total number of hair follicles on the legs and armpits is over 150,000 and is predetermined at birth. Over time, in fact, new follicles do not develop.
Are the hairs alive?
The cells that make up the hair die and harden as they are produced. The hair itself is not alive, unlike the root which is located deep at the base of the follicle. Stem cells of hair follicles have the ability to transform into skin cells to help heal cuts or skin damage; it is precisely in these complex follicles that the major source of stem cells is found.
Is it true that hair is unique to each person?
Just like fingerprints, the hair structure is also unique from person to person, although the differences are minimal. However, there are some general analogies according to the color of the hair. Blond hair tends to be thinner than black and brown hair; this reduced thickness, however, does not correspond to the number of hairs, but to the diameter of each individual hair. Black hairs, like those of the populations of East Asia, measure approximately 90 microns, while blond hairs like those of the Scandinavians measure approximately 60-70 microns.
Are women’s hair thinner than men’s?
Yes, but their thickness is deceptive: each hair is as resistant as a copper wire of similar thickness. Furthermore, the hair on a man’s face is much thicker than that present on the legs or under the armpits of a woman, so much so that, on average, men’s beard has almost the same number of hairs present on the lower part of the legs and armpits of a woman put together.
Does hair grow faster at certain times of the year?
Experts have not yet determined whether the seasons can affect the condition of the hair, as it does for the skin. The Spaniards, for example, are convinced that women are affected by seasonal changes, while other scholars believe that the hairs become stronger in the spring. Many tend to think that hair is less affected by the seasons and more by hormones. In pregnancy, for example, many women have thicker hair, even if the growth is not greater: the higher estrogen levels lengthen the hair growth phase, which are reduced in the remaining phase, so they appear more slowly, giving the impression of having a greater thickness.