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 this 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 has access to the hair papilla. During the remaining stages of the hair's life, there is no access to the hair papilla, and after physical removal of the hair shaft, 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, pushing the substance into the area of keratinization, or keratinization. Hair nutrition is provided blood vessels hair papilla. Hormones also reach it through the blood: androgens lengthen the phase active growth, which is why with hirsutism, vellus hair begins to lengthen and degenerate.

When cell division is reduced, the hair follicle shrinks - a transition period begins, or catagen stage. During this period, the hair papilla atrophies, so cells deprived of nutrition stop dividing, and the hair becomes telogen stage- this 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 anew.

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 of occurrence (anagen), mm
Body area	telogen	anagen	catagen	telogen	anagen	Number of follicles per 1 cm 2	Growth rate, microns per day	Depth of occurrence (anagen), mm
Scull	13	85	1-2	12-16	2-6 years	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 hips	80	20		24	16	60	210	2,5-4
Female breast	70	30				65	350	3-4,5

Knowing how many follicles are located in a given area of the body, how many are dormant, and how many are actively growing, helps estimate the time it will take to epilate that area, how often repeat procedures will need to be performed, and how many 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 serve as a guide only. Hormones can significantly influence the rate of growth and the entire 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 in the best case scenario, you can get rid of 30% of the hair in this area the first time. The telogen stage for armpit hair lasts 12 weeks, let's allow another 2 weeks for the hair to appear on the surface (the product of growth rate and depth) - 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). Unfortunately, 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

Hence the conclusion that removing hair from the sleep stage is pointless. However, this is not entirely true. If we are talking about electrolysis, then during thermolysis, the source of heat 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. That's all chemical methods slowing 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 will hair grow faster and why?
Where will hair need to be removed more often and why?
Where will the result come faster and why?

The correct answers in my opinion:

Hair on your face will grow faster, but the speed of growth 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 after a week or two, this hair will grow back and it will seem that the previously treated hair has grown back, but this is not the case. This explains the fact that the face is initially treated at least 2 times a month. After some time, hair growth will synchronize, and you will be able to go to treatments less often. On the legs, most of the hair is in the sleep stage, so after the first removal it will seem that the hair is “going away” perfectly, but in reality it is just sleeping.
On the face again. I am sure that you answered this question correctly. Although in reality facial hair has a very long anagen growth phase and a pause of several months between procedures is acceptable, no one wants to grow a bushy beard and goes more often.
Most likely, it’s 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 there’s no gradual degeneration vellus hair there won't be; 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 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 regrowth 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, ill.
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 our palms, lips and feet, is covered with hair. Initially, it may seem that their number is impossible to count. In fact, scientists have long conducted necessary research and calculations. Approximately 5 million hairs cover the entire skin. How many hairs does a person have on his head? What determines their growth, density, length?

Number and thickness of hair

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

on your head?

Hair growth is cyclical and lasts throughout a person's life. Trichologists have calculated that about 20 hairs grow from one follicle over 60 years. Over the entire period, they go through several stages, each lasting from 2 to 5 years: growth (anagen), dormancy (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 reasons. It is known that in the dark, hair practically does not grow. And in summer and spring they grow faster than in winter. The normal growth rate is 0.35 mm per day. Hair can grow approximately 10 mm in a month. As experts note, some people, due to various reasons hair can grow 1.5-2 cm in one month. Considering how much hair there is on a person’s head, it has been discovered that there are quite a few “dormant” follicles hidden in the skin. They can grow into strong, healthy hair. This is one of the active areas that specialists are working on to combat baldness.

Daily loss rate

You can usually find information about what per day healthy person loses from 60 to 150 hairs. This is a fairly 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 they lose? The quantity may vary depending on the time of year. Norm, installed by specialists, ranges from 0.003% to 9%. The alarm should only be sounded if the loss is more than 9%. There is an easy way to check the condition of your hair: slightly pull the strands (preferably the ends) in the area of the temples and the back of the head. If there are more than 5 hairs on the palm of your hand, you should not hesitate to take serious treatment measures. This experiment should be carried out on clean, dry hair. The causes of loss can be both internal and external. The main internal ones are poor ecology, excessive use of styling products, cheap dyes and low-quality combs that damage the scalp. External reasons: taking medications, poor nutrition, violation hormonal levels. Do not forget that if everything is in order with your health, only hairs that have outlived the cycle are susceptible to loss. They have a white hair follicle. If it is black, consult a doctor immediately.

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

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

If you have little hair on your head or it is weakened and brittle, then doctors recommend:

Choose the right combing tool. Good brush improves blood circulation. It is highly not recommended to use plastic combs, especially for those with weak hair and sensitive skin.
Proper hair washing is very important for healthy hair. Use only soft water, lukewarm or cool.
Use hot rollers, curling irons, and straightening irons less.
Stick to the right one healthy eating. There is nothing worse for hair than diets, stress, and illness.
Take hair vitamins, learn to relax.

Take care of your hair and be beautiful!

Hair adorns a person’s head; it emphasizes a person’s individuality, his beauty, and his state of mind.

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

There are so many things our hair can’t stand, and haircuts, and dyeing, and curling, and straightening, and braiding, and extensions, and exposure to cosmetics... And with all this, we want our hair to grow well and not fall out.

There are many interesting questions and answers, facts about hair loss and 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 should fall out very rarely. Without going deeply into the structure of the hair, 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 hair:

Anagen – stage of intensive hair growth. The older a person is, the shorter this period becomes. During the anagen stage, the hair follicle grows, melanin cells are actively formed, which produce hair coloring 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 research by the German scientist Trotter.

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

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

Telogen - the resting stage of the hair, when the hair follicle is freed from the old hair and it falls out. When washing our 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.

During 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 we wash our hair, a sizable bunch of lost hair is collected. And a suspicion immediately arises: maybe this is due to frequent washing of your hair? Of course not.

When you wash your hair, it is no longer living hair that falls out, but telogen hair. Healthy hair Washing your hair doesn't hurt. Absolutely normal occurrence A daily loss of 50 to 100 hairs is considered. Frequent contact with a comb, shampoo, or water does not cause hair loss.

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

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

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

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

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

Does hair really get thicker with frequent haircuts?

There is a lot of talk about the fact that haircuts affect hair thickness. What's really going on? Hair grows from follicles (hair follicles), and how many of these follicles nature has placed 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. After all, during cutting, 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 yourself that frequent use hairdryer leads to increased hair loss hair. If you frequently dry your hair on a hot setting, your hair will become dry and it will be lost. external 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 hairdryer. Do not bring the hair dryer close to your head, a distance of 15-25 cm is considered optimal, it is better to guide your hair with your hand rather than with a comb, read: causes of hair loss.

Is baldness hereditary?

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

How long does the hair on your head last?

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

The lifespan of hair depends on many reasons, including hereditary factors, health status of the body, nutritional balance and other factors.

Over the course of a person’s entire life, hair manages to “go through” about 25 full cycles growth and development. It was noted that the thickest and long hair in a person at a young age from 15 to 18-19 years.

After each successive life cycle of the hair, it becomes shorter, and the hair itself changes, also becoming 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).

Constantly wearing a hat on your head will increase hair loss.

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

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

Custom-fitted hats protect your head and hair from the elements environment: from hypothermia and overheating, which affects the preservation of healthy hair.

Can baldness be cured?

Modern medicine now offers effective methods and methods for treating alopecia. It is important to correctly establish the cause of early hair loss, because very often the body gives a signal of some internal disease through hair loss.

Often, to restore hair, it is enough to use external preparations that promote hair restoration. In some situations, taking vitamins and minerals, using external cosmetics, .

Doctors say that even the most advanced cases are treatable. Only this requires a more serious approach.

IN lately The drug for hair restoration is increasingly being advertised. This is a mask to stimulate hair growth - Bliss Hair, which revives the fallen 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 transplantation. I read about this product on the site, take a look, it might be suitable for you: BLOG E. Foundling

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He will try to help you understand this issue so that you can take action in time or, conversely, can calm down and make sure that everything is okay with you.

It will probably not be a revelation to you that hair loses everything, except, of course, for those who have nothing left to lose. This is absolutely a process indicating that the update processes in yours are proceeding as expected. The human body is designed in such a way that skin They are constantly renewed, old ones die off, and new ones appear in their place. The same applies to, which are part of the protective covers.

This is all clear, but this raises the question: how much hair should fall out normally?, does not become less relevant. A definite answer will probably not satisfy you, because according to experts, the loss of 45 to 170 hairs per day can be considered normal.

This information is likely to confuse you even more, so let's figure out what this figure depends on.

First of all, it is logical to know how many hairs are on your head generally there 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 point is that number of hairs varies depending on many factors. If you take the average European, then, with red hair, he most likely has about 70–80 thousand hairs. If he is dark-haired, then this number rises to 100 thousand. Brown shade add another 10 thousand to the owner and, finally, blondes take the lead, for whom the average normal amount 150 thousand hairs are considered.

It's also worth knowing that not all hair follicles function at the same time. Most of them (about 90%) continue to work honestly and produce hairs, while the rest are “on vacation” - sleeping or preparing to wake up. It is also estimated that approximately 15% of hair is in this stage at any one time, which is where you should start when answering the question of how much hair you personally should lose.

Let's assume that you are a brunette and take the normal number of hairs for you as 100,000 pieces. Let's calculate that 15% of this figure is equal to 15,000. This is exactly 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 the 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 has fallen out along with dead hair. Rest assured, the hair follicle - a cozy nest with a full supply of “food” for a new hair, remains in place. It's probably worth it pay attention to hair, fallen out without a bulb. If, upon closer examination, you see that it is thinning at the ends, then you are most likely dealing not with hair loss, but with hair fragility, and this is a slightly different problem.

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

Sometimes it may give the false impression that you have 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 see that the hair has thinned considerably. This happens if the hair has become thinner. This may also indicate that some hair follicles are “staying late on vacation.” This is quite possible and does not happen very rarely for a number of reasons.

If you notice something like this or the amount of hair falling out does not fit into the given framework, you should seek advice from 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 every day? Or which nail grows faster?

Facial hair

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

How much hair grows per day

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

Men's and women's hair: What's the difference?

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

Hair is light, hair is heavy

On average, one hair can withstand a weight of 100 to 200 grams. Therefore, in terms of strength, hair can be compared to 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 yet fully figured out why nail growth depends on the length of the fingers. However, it is known that the nails on the middle fingers grow faster than on the other fingers: the fastest growing nail is on the middle finger active hand. On the other hand, nails grow slowest on the little finger.

Hairy like a chimpanzee

The number of hairs per square centimeter of human skin is approximately the same as that of chimpanzees. Hairline a person’s hair is quite thick, but most of the hairs are too light and small to be noticeable to others.

Color and thickness

On average, a person has about 100 thousand hair follicles, and each grows about 20 individual hairs throughout life. However, hair thickness differs depending on color. So, people with blond hair about 146 thousand hair follicles, black-haired people have about 110 thousand, brown-haired people have 100 thousand, and the last place in the number of hair follicles is occupied by red-haired people - about 86 thousand follicles.

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

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

How long does hair last?

Lifespan human hair ranges from approximately 3 to 7 years. Although a person loses a lot of hair every day, the hair has quite long life unless they are injured. They can go through many haircuts and hairstyles and it will take many years before they fall out.
A person loses hundreds of hairs every day, but you only need to lose about half of your hair before anyone notices that you are going bald.

They are not afraid of either cold or heat

Human hair is virtually indestructible. Besides the fact that hair is highly flammable, it is practically invulnerable. Hair cannot be destroyed by cold, climate change, water or other forces of nature, and it is also resistant to many types of acids and chemicals.