A little chest hair can be very sexy but a lot of it makes you look like a woolly mammoth! ha2.... and i feel chest hair makes u more stinky!
"At the start of pubery.
Usually ages 12-15 in males, it grows.
Actually, men don't stop developing their body hair
until they are in their 30s,
so it's fairly common to be smooth-chested
for a long time and then in adulthood
find you have a hairier chest
than you did as a teenager" Wiki answer
Vellus hair is already present in the area in childhood, the term chest hair is generally restricted to the terminal hair that develops as an effect of rising levels of androgens (primarily testosterone and its derivatives) due to puberty. Different from the head hair, it is therefore a secondary sexual characteristic. In contrast to women the body of men tends to be covered far more with terminal hair, particularly on the chest, the abdomen and the face.
The development of chest hair begins normally during late puberty, usually between the ages of 16-19. It can also start later, between the age of 20 and 30, so that many men in their twenties have not yet reached their full chest hair development. The growth continues subsequently. In older adult years androgens cause thickening of the hair.
"It has to do with the way testosteron is converted to DHT. There is a genetic prediposition to body hair distribution, but the penetrance is variable. Also, varying hormonal levels in men can lead to changes in hair distribution; which also explains the variation you may observe." yahoo answer
The individual occurrence and characteristics of chest hair depend on the genetic disposition, the hormonal status and the age of the person. The genes primarily determine the amount, patterns and thickness of chest hair. Some men are very hairy, while others have no chest hair at all. Each pattern of hair growth is normal. The areas where terminal hair may grow are the periareolar areas (nipples), the centre and sides of the chest and the clavicle (collarbone).
The direction of growth of hair can make for interesting patterns, akin to depictions of mathematical vector fields. Typical males will exhibit a node on the upper sternum, the hair above which points up and the hair below which points down. Some individuals (of say the pattern in diagram 3) have spirals on their upper pectoral regions (several inches from the nipple towards the neck) which run clockwise on the left breast and counter-clockwise on the right.
Considering an individual occurrence of chest hair as abnormal does not implicitly depend on medical indications but primarily on cultural and social attitudes. An excessive growth of terminal hair on the body of men and women is called hypertrichosis. This medical term has to be distinguished from hirsutism that just affects women. These women can develop terminal hair on the chest following the male pattern as a symptom of an endocrine disease.
There have been occasional studies documenting patterns of chest hair in men and occurrence of these patterns. A study of 1100 men aged 17 to 71 defined and documented ten patterns of chest hair in Caucasoid men. In this study 6 percent of the men were found to have no chest hair. The largest group, 56 percent, displayed pattern four as shown in the accompanying figure. The remaining 38 percent of the men displayed a lesser quantity of chest hair. Seven percent displayed pattern one, 13 percent displayed pattern two and 18 percent displayed various other patterns.
The same study documented the chest hair patterns of 60 African-American men aged 20-40. For these men 22 percent were found to have no chest hair. The largest group, 37 percent displayed pattern four and the remaining 41 percent had a lesser quantity of chest hair. Eight percent displayed pattern one, 12 percent pattern two and 11 percent displayed various other patterns.
"A man's hair pattern follows the men on his Mother's side. So, look at your Mom's Dad or brothers. Chances are, your hair will be similar to theirs. It's all in the genes" yahoo answer
Before puberty, the abdominal region of both males and females is covered with very fine vellus hair. In response to rising levels of androgens (mainly testosterone) during and after puberty, the skin of the abdomen begins to produce coarser, longer and more pigmented hair (terminal hair). This process affects primarily men. Initially hair grows in a vertical line from the pubic area up to the navel and from the thorax down to the navel. Although the development of abdominal hair normally begins during puberty, it may also start later, between the ages of 20 and 30. With some men, the abdominal hair will stay within a clearly defined vertical line, but in others, terminal hair will appear laterally as well as vertically, particularly in the area around the navel. This lateral spreading can continue into middle age. Abdominal hair (particularly the "treasure trail") often signifies young teen men stepping into adulthood, as it represents that their bodies are changing. The study noted below found that two in three young men have a (sagittal) "treasure trail" by the time they are seventeen, and nearly half have one by time they are fifteen.
Some women may develop a small line of hair from the pubic area up to the navel. According to the female sex image in some cultures this is seen as desirable, and in others it is seen as unattractive. Excessive abdominal hair on women, following the male pattern, is called hirsutism.
Various studies of Caucasian subjects have documented four general patterns of pubic and abdominal hair including:
Horizontal - Characterized by upper surface of pubic hair terminating in a horizontal line with no hair extending to the abdomen.
Sagittal - Resembles the first but with the addition of a narrow vertical band of hair extending from the pubic hair towards the navel, often slang called a 'Snail Trail'. (See Photograph)
Acuminate - Characterized by a tapered, inverted 'V' pattern extending upward from the pubic hair. Upper limit may end below the navel, at the navel, above the navel or near the chest. (Example shown in accompanying photograph.)
Disperse (or quadrangular) - Hair is distributed broadly over the abdomen without forming a discrete geometric pattern.
Richard Zickler performed a 1997 study (see citation below) of the above patterns and their occurrence in males and females, paying particular attention to the development of hair during puberty. in In Zickler's study the horizontal pattern was most common in females with an incidence of about 80 percent. This pattern occurred in 6% of males, including 55% of 13-15 year olds and 28% of 16 and 17 year olds. The sagittal pattern was found in 44% of males under 16,67% of males aged 16-17, 20% of males over 17, and 17% of females. The acuminate pattern occurred in about 55 percent of males and occasionally in females. The disperse pattern occurred in about 19 percent of the males studied.
=============
DHT: Dihydrotestosterone
a biologically active metabolite C19H30O2 of testosterone having similar androgenic activity, formed primarily in the prostate gland, testes, hair follicles, and adrenal glands by the enzyme 5α-reductase by means of reducing the 4,5 double-bond,
also commonly called androgenic hormones or testoids
DHT is produced by males in vivo and is responsible for the formation of male sex-specific characteristics. DHT is an important contributor to other characteristics generally attributed to males, including facial and body hair growth, and deepening of the voice. DHT may also play a crucial role in both sex drive and the growth of muscle tissue.[2] Unlike other androgens such as testosterone, DHT cannot be converted by the enzyme aromatase to estradiol[3]. It, therefore, is frequently used in research settings to distinguish between effects of testosterone caused by binding to the androgen receptor, and those caused by testosterone's conversion to estradiol and subsequent binding to estrogen receptors.
DHT is the primary contributing factor in male-pattern baldness. This is not the case for women; female-pattern baldness is characterized by increased rates of production of testosterone, but not of DHT.
"At the start of pubery.
Usually ages 12-15 in males, it grows.
Actually, men don't stop developing their body hair
until they are in their 30s,
so it's fairly common to be smooth-chested
for a long time and then in adulthood
find you have a hairier chest
than you did as a teenager" Wiki answer
Vellus hair is already present in the area in childhood, the term chest hair is generally restricted to the terminal hair that develops as an effect of rising levels of androgens (primarily testosterone and its derivatives) due to puberty. Different from the head hair, it is therefore a secondary sexual characteristic. In contrast to women the body of men tends to be covered far more with terminal hair, particularly on the chest, the abdomen and the face.
The development of chest hair begins normally during late puberty, usually between the ages of 16-19. It can also start later, between the age of 20 and 30, so that many men in their twenties have not yet reached their full chest hair development. The growth continues subsequently. In older adult years androgens cause thickening of the hair.
"It has to do with the way testosteron is converted to DHT. There is a genetic prediposition to body hair distribution, but the penetrance is variable. Also, varying hormonal levels in men can lead to changes in hair distribution; which also explains the variation you may observe." yahoo answer
The individual occurrence and characteristics of chest hair depend on the genetic disposition, the hormonal status and the age of the person. The genes primarily determine the amount, patterns and thickness of chest hair. Some men are very hairy, while others have no chest hair at all. Each pattern of hair growth is normal. The areas where terminal hair may grow are the periareolar areas (nipples), the centre and sides of the chest and the clavicle (collarbone).
The direction of growth of hair can make for interesting patterns, akin to depictions of mathematical vector fields. Typical males will exhibit a node on the upper sternum, the hair above which points up and the hair below which points down. Some individuals (of say the pattern in diagram 3) have spirals on their upper pectoral regions (several inches from the nipple towards the neck) which run clockwise on the left breast and counter-clockwise on the right.
Considering an individual occurrence of chest hair as abnormal does not implicitly depend on medical indications but primarily on cultural and social attitudes. An excessive growth of terminal hair on the body of men and women is called hypertrichosis. This medical term has to be distinguished from hirsutism that just affects women. These women can develop terminal hair on the chest following the male pattern as a symptom of an endocrine disease.
There have been occasional studies documenting patterns of chest hair in men and occurrence of these patterns. A study of 1100 men aged 17 to 71 defined and documented ten patterns of chest hair in Caucasoid men. In this study 6 percent of the men were found to have no chest hair. The largest group, 56 percent, displayed pattern four as shown in the accompanying figure. The remaining 38 percent of the men displayed a lesser quantity of chest hair. Seven percent displayed pattern one, 13 percent displayed pattern two and 18 percent displayed various other patterns.
The same study documented the chest hair patterns of 60 African-American men aged 20-40. For these men 22 percent were found to have no chest hair. The largest group, 37 percent displayed pattern four and the remaining 41 percent had a lesser quantity of chest hair. Eight percent displayed pattern one, 12 percent pattern two and 11 percent displayed various other patterns.
"A man's hair pattern follows the men on his Mother's side. So, look at your Mom's Dad or brothers. Chances are, your hair will be similar to theirs. It's all in the genes" yahoo answer
Before puberty, the abdominal region of both males and females is covered with very fine vellus hair. In response to rising levels of androgens (mainly testosterone) during and after puberty, the skin of the abdomen begins to produce coarser, longer and more pigmented hair (terminal hair). This process affects primarily men. Initially hair grows in a vertical line from the pubic area up to the navel and from the thorax down to the navel. Although the development of abdominal hair normally begins during puberty, it may also start later, between the ages of 20 and 30. With some men, the abdominal hair will stay within a clearly defined vertical line, but in others, terminal hair will appear laterally as well as vertically, particularly in the area around the navel. This lateral spreading can continue into middle age. Abdominal hair (particularly the "treasure trail") often signifies young teen men stepping into adulthood, as it represents that their bodies are changing. The study noted below found that two in three young men have a (sagittal) "treasure trail" by the time they are seventeen, and nearly half have one by time they are fifteen.
Some women may develop a small line of hair from the pubic area up to the navel. According to the female sex image in some cultures this is seen as desirable, and in others it is seen as unattractive. Excessive abdominal hair on women, following the male pattern, is called hirsutism.
Various studies of Caucasian subjects have documented four general patterns of pubic and abdominal hair including:
Horizontal - Characterized by upper surface of pubic hair terminating in a horizontal line with no hair extending to the abdomen.
Sagittal - Resembles the first but with the addition of a narrow vertical band of hair extending from the pubic hair towards the navel, often slang called a 'Snail Trail'. (See Photograph)
Acuminate - Characterized by a tapered, inverted 'V' pattern extending upward from the pubic hair. Upper limit may end below the navel, at the navel, above the navel or near the chest. (Example shown in accompanying photograph.)
Disperse (or quadrangular) - Hair is distributed broadly over the abdomen without forming a discrete geometric pattern.
Richard Zickler performed a 1997 study (see citation below) of the above patterns and their occurrence in males and females, paying particular attention to the development of hair during puberty. in In Zickler's study the horizontal pattern was most common in females with an incidence of about 80 percent. This pattern occurred in 6% of males, including 55% of 13-15 year olds and 28% of 16 and 17 year olds. The sagittal pattern was found in 44% of males under 16,67% of males aged 16-17, 20% of males over 17, and 17% of females. The acuminate pattern occurred in about 55 percent of males and occasionally in females. The disperse pattern occurred in about 19 percent of the males studied.
=============
DHT: Dihydrotestosterone
a biologically active metabolite C19H30O2 of testosterone having similar androgenic activity, formed primarily in the prostate gland, testes, hair follicles, and adrenal glands by the enzyme 5α-reductase by means of reducing the 4,5 double-bond,
also commonly called androgenic hormones or testoids
DHT is produced by males in vivo and is responsible for the formation of male sex-specific characteristics. DHT is an important contributor to other characteristics generally attributed to males, including facial and body hair growth, and deepening of the voice. DHT may also play a crucial role in both sex drive and the growth of muscle tissue.[2] Unlike other androgens such as testosterone, DHT cannot be converted by the enzyme aromatase to estradiol[3]. It, therefore, is frequently used in research settings to distinguish between effects of testosterone caused by binding to the androgen receptor, and those caused by testosterone's conversion to estradiol and subsequent binding to estrogen receptors.
DHT is the primary contributing factor in male-pattern baldness. This is not the case for women; female-pattern baldness is characterized by increased rates of production of testosterone, but not of DHT.
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