Life cycle, growth rate and depth of hair in various parts of the human body. There is an opinion that bald men are loving, is it true? Anagen - growth stage

Etc.) it is important to act on the hair follicle when it is in the anagenesis stage - that is, it is actively growing and therefore there is access to the hair papilla. In the remaining stages of the life of the hair, there is no access to the hair papilla, and after the physical removal of the hair shaft, a new hair will grow in this place.

Life cycle of a hair, drawing [Morris] anagen stage- this is a period of active division of epidermal cells and melanocyte cells that produce melanin. Hair is one of the fastest growing tissues human body. Cell division creates pressure inside the hair follicle that pushes the substance into the area of keratinization, or keratinization. Provide hair nutrition blood vessels hair papilla. Hormones also come to it through the blood: androgens lengthen the phase active growth, which is why with hirsutism, vellus hair begins to lengthen and regenerate.

When cell division is reduced, the hair follicle shrinks - a transition period occurs, or catagen stage. During this period, the hair papilla atrophies, so cells deprived of nutrition stop dividing, and the hair passes into telogen stage is the resting phase. The hair follicle separates from the hair papilla and begins to move towards the surface of the skin. At this time, a new hair follicle begins to form around the hair papilla, and the hair growth process starts again.

Table 1. Hair life cycle, number of follicles, growth stages and depth [Morris, Richards]

body area	% hair in stage			Stage duration, weeks		Number of follicles per 1 cm 2	Growth rate, microns per day	Depth (anagen), mm
body area	telogen	anagen	catagen	telogen	anagen	Number of follicles per 1 cm 2	Growth rate, microns per day	Depth (anagen), mm
Scull	13	85	1-2	12-16	2-6 years old	350	350	3-5
Brows	90	10		12	4-8		160	2-2,5
Ears	85	15		12	4-8
Cheeks	30-50	50-70				880	320	2-4
Beard (chin)	30	70		10	52	500	380	2-4
Mustache (above lip)	35	65		6	16	500		1-2,5
Armpits	70	30		12	16	65	300	3,5-4,5
Torso						70	300	2-4,5
Pubis	70	30		2	from 4	70		3,5-4,75
forearms	80	20		18	13	80	300
Legs and thighs	80	20		24	16	60	210	2,5-4
Women's breasts	70	30				65	350	3-4,5

Knowing how many follicles are located in a given area of the body, how many of them are dormant and how many are actively growing, helps to estimate the time it will take to epilate this area, how often you will need to repeat procedures and how many of them are likely to be needed. . The hair growth program is genetically determined and differs from person to person. different people, so the numbers in the table are only a guideline. Hormones can significantly affect the growth rate and the whole life cycle hair.

Let's look at the table using the armpits as an example. Here, 30% of the hair is in the anagen stage. This means that with the best outcome for the first time, you can get rid of 30% of the hair in this area. The telogen stage for axillary hair lasts 12 weeks, let's put another 2 weeks for the hair to appear on the surface (the product of the growth rate and the depth of occurrence) - a total of at least 14 weeks to process all the hair in the armpits. The intervals between procedures should not exceed 16 weeks (the time during which the hair is in the anagen stage). Alas, this is an idealized case: in reality, no type of hair removal allows you to remove 100% of anagen hair, so hair removal in the armpits instead of 3.5 months.

This also leads to the conclusion that it is pointless to remove hair from the sleep stage. However, this is not quite true. If we are talking about electrolysis, then during thermolysis, the heat center can touch the emerging new hair (more on that). For laser hair removal, this is also partly true if the hair has already begun to grow, because in this case there is already something in this hair to absorb the radiation energy. And that's all chemical methods Slowing down hair growth on telogen hair will not work at all.

If you understand this material, then imagine the situation: you plucked the hair on your chin and legs, then grew it to 5 mm and went for electrolysis to get rid of hair forever. Now answer the following questions, but don't peek at the answers. Just check yourself:

Where does hair grow back faster and why?
Where hair will need to be removed more often and why?
Where will the result come faster and why?

Correct answers in my opinion:

On the face, hair will grow faster, but the growth rate has nothing to do with it. The fact is that the anagen phase here is one of the longest, so there is much more hair in early anagenesis - when the hair grows, but has not yet appeared on the surface of the skin - than on the legs. So in a week or two, this hair will grow back and it will seem that previously treated hair has grown, but this is not so. This explains the fact that the face is treated at first at least 2 times a month. After a while, hair growth is synchronized, and it will be possible to go to the procedures less often. On the legs, most of the hair is in the dormant stage, so after the first removal it will seem that the hair “leaves” perfectly, but in reality they are just sleeping for now.
On the face again. I'm sure you answered this question correctly. Although in reality facial hair has a very long anagen growth phase and pauses between treatments of several months are acceptable, no one wants to grow a bushy beard and walks more often.
Most likely, it is faster on the legs, and here's why: 1) this is a hormone-independent area and the hair below the knee is all terminal, so no gradual degeneration vellus hair will not; 2) the full cycle of hair growth on the legs is shorter. Formally, the telogen phase of hair on the chin is much shorter than on the legs, so the first complete cleaning on the face will pass twice as fast if all the hair could be removed the first time, then three months would be enough for the face (telogen phase + conditional 2 weeks for hair to grow from early anagen), and for the legs it would take 4-5 months.

Sources:

Morris, D. Encyclopedia of hair removal: everything about hair removal for professionals and beauty salons / D. Morris, D. Brown. - M.: RIPOL classic, 2008. - 400, illus.
Robert N. Richards, G. E. Meharg. Cosmetic and Medical Electrolysis and Temporary Hair Removal: A Practice Manual and Reference Guide / Robert N. Richards, G. E. Meharg. - Medric Ltd, ISBN: 978-0969474630 (1997)

Man is one of the hairiest creatures on earth. Our entire body, with the exception of the palms, lips and feet, is covered with hair. Initially, it may seem that their number is impossible to calculate. In fact, scientists have long necessary research and calculations. Approximately 5 million hairs cover the entire skin. How many hairs does a person have on their head? What determines their growth, density, length?

Number and density of hair

The main factor on which the number of hairs on the head depends is their color. In general, the density depends on many reasons, it is not only the shade, but also gender, age, location on the scalp, heredity. The greatest density is usually in the crown area. The head area is 580 square centimeters. One square centimeter head contains approximately 200-300 hair follicles. So, you can easily calculate the amount of hair on your head by multiplying these data. We get an average figure of 116,000-174,000. This is only an approximate number, the parameter can be significantly higher or lower, depending on genetics and many other factors. Scientists have proven that the thickest are light brown and blond hair - 120,000-150,000. For brunettes - 110,000, 80,000 for red-haired people. Gender also has a significant effect on the density of hair, for example, men have 10% fewer hairs than women. In addition, the strong half is more likely to face the problem of falling out.

on your head?

Hair growth is cyclical and lasts a lifetime. Trichologists have calculated that about 20 hairs grow from one follicle in 60 years. Over the entire period, they go through several stages, each lasting from 2 to 5 years: growth (anagen), rest (catagen), loss (telogen). Each of the hairs lives in its own mode, so at the same time they are on different stages cycle. Usually about 80% grows, the rest are in the stage of rest and loss, thereby making room for new hair. Growth time is calculated per day. Moreover, the speed depends on many factors. It is known that in the dark, hair practically does not grow. And in summer and spring they grow faster than in winter. The growth rate is considered to be 0.35 mm per day. Approximately 10 mm of hair can grow in a month. According to experts, in some people, due to different reasons hair can grow 1.5-2 cm in one month. Considering how much hair a person has on their head, it has been found that there are quite a few “sleeping” follicles hidden in the skin. Strong healthy hair can grow from them. This is one of the active areas in which specialists are engaged in the fight against baldness.

Daily drop rate

You can usually find information about what's on the day healthy man loses 60 to 150 hairs. This is a pretty significant spread. It depends, first of all, on the initial amount of hair. Do not neglect the fact that the rate of loss is not always the same. So how much hair on a person's head should fall out? The amount may vary depending on the time of year. Norm, established by specialists, ranges from 0.003% to 9%. The alarm should be sounded only when the loss is more than 9%. There is an easy way to check the condition of the hair: pull a little on the strands (preferably on the tips) in the area of the temples and the back of the head. If there are more than 5 hairs in the palm of your hand, you should not hesitate to take serious treatment measures. It is worth conducting such an experiment on clean, dry hair. Causes of loss can be both internal and external. The main internal ones are bad ecology, abundant use of styling products, cheap dyes and low-quality combs that damage the scalp. External causes: medication, malnutrition, violation hormonal background. Do not forget, if everything is in order with health, only obsolete hairs are subject to loss. They have a white hair follicle. If it is black, see a doctor immediately.

How much hair on a person's head should fall out when washing?

If you notice that your hair falls out profusely when washing, especially when more hairs than usual are washed off with shampoo, this is alarm signal. Naturally, some part of them falls out, but with the normal course of physiological reactions, this process should be absolutely not noticeable. The norm of 150 hairs in the bathroom is quite a lot. To maintain hair, do not neglect proper care. Often it is incorrect choice detergents causes hair problems. Choose high-quality shampoos, rinse your head with cool water, use natural bristle brushes.

If you have little hair on your head or they are weakened, brittle, then doctors recommend:

Choose the right combing tool. good brush improves blood supply. It is highly not recommended to use plastic combs, especially for those who have weakened hair, sensitive skin.
Proper shampooing is very important for hair health. Use only soft water, slightly warm or cool.
Less use thermal curlers, curling irons, irons.
Stick to the right healthy eating. There is nothing worse for hair than diet, stress, illness.
Take hair vitamins, learn to relax.

Take care of your hair and be beautiful!

Hair decorates the head of a person, they emphasize the individuality of a person, his beauty, state of mind.

This is probably why, each of us strives to make our hair attractive, well-groomed, exposing them to various manipulations.

They just can’t stand hair, and haircuts, and dyeing, and perm, and straightening, and weaving braids, and extensions, and exposure to cosmetics ... And with all this, we want the hair to grow well and not fall out.

There are many interesting questions and answers, facts about hair loss and hair growth and this once again emphasizes that this problem very relevant and of interest to many.

Interesting facts about hair growth and development

Some people think that the hair on the head grows continuously and they should fall out very rarely. If you do not go deep into the structure of the hair, then we can say that it consists of a bulb or hair follicle with a papilla, which is located under the skin and the hair itself or the hair shaft.

Three stages of hair development

Scientists note 3 stages of development in the life of a hair:

Anagen - stage of intensive hair growth. The older the person is, the shorter this period becomes. In the anagen stage, the hair follicle grows, melanin cells are actively formed, which produce coloring hair melanin pigment.

Hair in this stage grows at a rate of 0.4-0.5 mm per day, and the duration of the anagen stage lasts from 2 to 10 years, according to the research of the German scientist Trotter.

Catagen - an intermediate stage of hair development, between its growth and the resting phase. In this stage, gradual atrophy of the papilla on the hair follicle occurs, and nutrients enter the hair through the papilla.

As nutrition stops, the follicle cells stop dividing and growing and become hard, keratinized over time. The catagen stage lasts only a few weeks.

Telogen - the resting stage of the hair, when the hair follicle is released from the old hair, and it falls out. When washing the hair, when we actively massage the scalp and when combing, telogen hair falls out faster. The resting stage of the hair follicle lasts up to 3 months.

In the course of a person's life, hair falls out and grows again, that is, these stages of hair development are repeated up to 25 times.

Does hair loss depend on frequent washing?

Sometimes we notice with horror that when washing our hair, a decent bunch of fallen hair is collected. And immediately there is a suspicion, or maybe this is due to frequent shampooing? Of course no.

During shampooing, no longer living hair falls out, but telogen ones. healthy hair shampooing does not hurt. Absolutely normal a daily loss of 50 to 100 hairs is considered. Frequent contact with a comb, shampoo, water - is not the cause of hair loss.

There is an opinion that bald men are loving, is it true?

Once, about a hundred years ago, Dr. James Hamelton, theoretically proved that in male baldness in early age involved male hormone testosterone, on which increased activity men.

Modern medicine has proven that baldness (alopecia) is not associated with the level of testosterone in the blood, but with the sensitivity of receptors in the hair follicles to a testosterone derivative - dehydrotestosterone.

And if the amount of testosterone in the blood is below the level established norm baldness can still develop. And the development of this process depends on the degree of sensitivity of hair follicle receptors to a testosterone derivative - dehydrotestosterone.

And the sensitivity of these receptors is determined by hereditary factors. It turns out that in early male pattern baldness, their androgenetic alopecia, it is not testosterone that is to blame, but heredity.

Does hair really get thicker from frequent haircuts?

There is a lot of talk about the fact that haircuts affect the density of hair. What is really going on? Hair grows from follicles, (hair follicles), and no matter how much nature has laid these bulbs on your head, no haircut will increase their number.

After a haircut, if the haircut is short, it seems that the hair has become thicker. This appearance of density. Indeed, during the haircut, the tip of the hair is flattened, thereby creating the appearance of increased volume at the ends of the hair.

Does frequent use of a hair dryer really lead to hair loss?

You have probably heard the opinion that frequent use hair dryer leads to increased loss hair. With frequent drying of hair in a hot mode, the hair is dried out, it is lost. outer beauty, shine, silkiness, they become brittle and split.

Proper use of a hair dryer cannot cause hair loss. First you need to dry your hair with a towel, and then use a hair dryer. Do not bring the hair dryer close to the head, the distance of 15-25 cm is considered optimal, it is better to guide the hair with your hand, and not with a comb, read: causes of hair loss.

Is hair loss hereditary?

With early hair loss in men, the cause of androgenetic alopecia is often heredity. Statistics say that only 15% of alopecia is transmitted through the paternal line, and in 70-75%, the predisposition to alopecia goes through the maternal line.

How long does the hair on the head live

How long will hair grow if not cut? At the beginning of the article, 3 stages of development and life of the hair are described. Hair cannot grow indefinitely, it all depends on the stage of hair development.

The lifespan of hair depends on many reasons, this and hereditary factors, the state of health of the body, a balanced diet and other factors.

Over the entire life of a person, the hair has time to "pass" about 25 full cycles growth and development. It is noted that the thickest and long hair in a person in young age from 15 to 18-19 years old.

After, each next life cycle of the hair becomes shorter, and the hair itself changes, it also becomes shorter and thinner.

The average duration of one hair growth cycle is approximately 5-7 years, although it has already been noted that they live up to 10 years (this depends on many reasons).

If you constantly wear a hat on your head, it increases hair loss.

If a cap or hat does not squeeze the head, if it is made of natural materials and does not interfere with the air exchange of the head, then headgear can be worn without fear for the health of the hair.

It is important that the headgear does not squeeze the head and does not disrupt the normal blood supply to the head.

Fitted hats protect the head and hair from impacts environment: from hypothermia and from overheating, which affects the preservation of healthy hair.

Can hair loss be cured?

Modern medicine currently offers effective methods and methods for the treatment of alopecia. It is important at the same time to establish correctly the cause of early hair loss, because very often the body with hair loss gives a signal of some internal disease.

Often, for hair restoration, the use of external preparations that promote hair restoration is sufficient. In some situations, it helps to take vitamins and minerals, the use of external cosmetics, .

Doctors say that even the most advanced cases are treatable. It just takes a more serious approach.

AT recent times a drug for hair restoration is being advertised more and more often. This is a mask for stimulating hair growth - Bliss hair, that revives the sleepy hair follicles, promotes hair restoration even with advanced alopecia, but not more than 10 years.

The medical indication for the treatment of alopecia is laser therapy or hair transplant. I read about this tool on the site, see if it might work for you: BLOG E. Foundling

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He will try to help you understand this issue so that you have time to take action or vice versa, you can calm down and make sure that everything is in order.

It will certainly not be a revelation to you that hair is losing everything except, of course, those who have nothing to lose. This is a complete process indicating that the renewal processes in yours are proceeding as expected. The human body is designed in such a way that skin are constantly updated, the old die off, and new ones arise in their place. The same applies to, which are part of the protective covers.

This is all understandable, but from this question, how much hair should fall out normally does not become less relevant. An unequivocal answer will certainly not satisfy you, because according to experts, the loss of 45 to 170 hairs per day can be considered the norm.

This information, most likely, confused you even more, so let's figure out what this figure depends on.

First of all, it is logical to know how many hairs on the head generally should be. The question is simple, however, the answer is again ambiguous. The average number, called by experts, is 100,000 hairs. Average doesn't mean right for you. The fact is that amount of hair varies depending on many factors. If we take the average European, then, with red hair, he most likely has about 70-80 thousand hairs in the norm. If he is brunette, then this number grows to 100 thousand. brown shade add another 10 thousand pieces to the owner and, finally, blondes lead, for whom the average normal amount 150 thousand hairs are considered.

It is also worth knowing that not all hair follicles function at the same time. Most of them (about 90%) continue to honestly work and produce hairs, while the rest are "on vacation" - sleeping or preparing to wake up. It is also estimated that approximately 15% of the hair is in the stage at the same time, hence it is worth proceeding when answering the question of how much hair should fall out for you personally.

Let's assume that you are a brunette and we will take as a basis the amount of hair that is normal for you in 100,000 pieces. Let's calculate that 15% of this figure is equal to 15,000. That is how much is in the process of falling out. On average, the duration of this stage lasts a little more than 3 months or 100 days. If we divide all hair loss by the number of days, we get 150. This will be your hair loss rate per day.

You should also not panic at the sight of a hair follicle that fell out along with dead hair. Be sure that the hair follicle - a cozy nest with a full supply of "food" for a new hair, remained in place. Rather worth it pay attention to hair, dropped out without a bulb. If, upon closer examination, you saw that it is thinning at the ends, then you are most likely not dealing with hair loss, but with brittle hair, and this is a slightly different problem.

The next burning question for most women is the question of whether how long hair lives and grows. This one is a little easier. Latest Research showed that, on average, the life of a hair lasts within six months. The growth rate depends on the season and even the day. It has been proven that hair is faster in the warm season, the same thing happens at night. If we take the average figure, then the hair grows by 0.3–0.5 mm per day, which gives us a maximum of one and a half centimeters per month.

Can sometimes give the false impression that you too much hair falling out. In this case, the number of hairs on the comb will be within the normal range, but one look in the mirror will allow you to make sure that the hair has thinned out a lot. This happens if the hair has become thinner. It may also be evidence that some hair follicles are “delayed on vacation”. This is quite possible and not so rare for a number of reasons.

If you notice something similar or the amount of hair falling out does not fit into the above framework, you should seek the advice of a specialist and start on time.

Alexandra Panyutina
Women's magazine JustLady

Beautiful hair and nails are everyone's dream. Do you know how much hair you lose daily? Or which nail grows faster?

facial hair

As a rule, facial hair grows faster than other parts of the body. If you have ever shaved your facial hair, then you know that stubble appears as early as five hours after shaving. Any average man, if he stopped shaving, could grow a beard over 9 meters long in his lifetime.

How much hair grows per day

Every day a person loses from 60 to 100 hairs. Hair loss is affected by many factors such as season, health, diet, age, and even pregnancy. For example, in the morning and evening, hair grows faster, and at night it grows very slowly or stops growing altogether.

Men's and female hair: what is the difference?

Diameter male hair more than women in one and a half times. But, despite this, men's hair is more brittle. The diameter of the hair also depends on the race and age of the person. Black people have the thickest hair - up to three times thicker than fair-skinned people.

Hair is light, hair is heavy

On average, one hair can support a weight of 100 to 200 grams. Therefore, the strength of the hair can be compared with aluminum wire. If you combine all the hair that grows on a person’s head into one bundle, then the fairy tale about Rapunzel will become quite real.

Don't break your pinky nail

Scientists have not fully figured out why the growth of nails depends on the length of the fingers. However, it is known that the nails on the middle fingers grow faster than on the rest: the fastest growing nail is on the middle finger active hand. On the other hand, the nails on the little finger grow the slowest.

Hairy like a chimpanzee

The number of hairs per square centimeter of human skin is about the same as that of a chimpanzee. hairline a person is thick enough, but most of the hairs are too light and small to be noticeable to others.

Color and density

On average, a person has about 100 thousand hair follicles, and about 20 individual hairs grow from each during a lifetime. However, the thickness of the hair differs depending on the color. So, people with blonde hair about 146 thousand hair follicles, in black-haired people - about 110 thousand, in brown-haired people 100 thousand, and redheads occupy the last place in terms of the number of hair follicles - about 86 thousand follicles.

Why do manicures have to be done more often than pedicures?

On average, fingernails and toenails grow by 2.5 millimeters per month. However, you have probably noticed that you cut your toenails less often than on your hands. This is because toenails grow four times slower than fingernails.

How long does hair live

Lifespan human hair is approximately 3 to 7 years. Although a person loses a lot of hair daily, the hair has quite long life unless injured. They can survive many haircuts, hairstyles and it will take more than one year before they fall out.
A person loses hundreds of hairs every day, but you need to lose about half of the hair before anyone notices that you are bald.

They are not afraid of cold or heat

Human hair is virtually indestructible. In addition to being highly flammable, hair is practically invulnerable. Hair cannot be destroyed by cold, climate change, water or other forces of nature, and is resistant to many types of acids and chemicals.