Testosterone is the hormone that puts hair on a man’s chest and face. It also puts muscles on a boy when he reaches puberty. When a boy reaches puberty, it is testosterone that drives his sexual urges. Testosterone is responsible for the increase of a man’s penis size when he reaches puberty. Testosterone makes the voice deep and promotes sperm production. As a man gets older, his testosterone levels decline. When a man is between the ages of 25 and 75, his testosterone level can decrease by 30 percent or one percent every year after age 30. Some people think it is one percent every year after age 40. This lowering of testosterone levels are a normal part of aging. Signs of lowering testosterone levels can be seen in some loss of height because of lower bone density. Other signs of shrinking testosterone include, libido reduction, less muscle mass, and increasing fat. Low T as it is called, affects between 4 to 5 million men in the United States.
The decline in testosterone in aging men is considered a symptom of late-onset hypothyroidism. It is also known as andropause. The reduction of testosterone is associated with the loss of diminished testicular production of testosterone that is a reduction hypothalamic secretion of gonadotropin-releasing hormone, produced by the pituitary gland. There are two forms of Male hypogonadism, primary and secondary. Primary is attributed to a problem in the testicles. Usually, primary male hypothalamic secretion happens when a man has cancer. His testosterone production is inhibited by chemotherapy. Secondary is when there is a problem in the pituitary gland, located in the the hypothalamus. Sometimes this can be congenital problems or tumors. It is the pituitary gland that signals the testes to produce testosterone. Usually, men who have secondary male hypothalamic secretion are over the age of 40 and are going through the normal aging process.
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The pituitary gland is very important to the body during the time of puberty. This pea-sized gland is called the master gland because it is responsible for puberty getting underway. During puberty, a gland that secretes gonadotropin-releasing hormone (GnRH). GnRH. These two hormones saturate the pituitary glands. Luteinising hormone (LH) and follicle stimulating hormone (FSH) is produced. LH stimulates Leydig cells in the testes to produce testosterone. In the male, this is what allows the testes to begin producing semen in the male. When the male reaches adulthood, gradually the need for the pituitary gland to send messages for high rates of testosterone is not needed, and so the levels decline, gradually. There is a negative feedback loop that runs the process. This, in conjunction with the testosterone, inhibits the extend and the regularity of the hypothalamic and anterior pituitary secretions. This effects the levels of the testosterone. There are some medical reports that claim aging has nothing to do with lower testosterone levels. Other reports disagree with the findings that aging is not a factor in low testosterone levels. According to a study, 19 to 39 percent of most men over the age of 30 suffer from low levels of testosterone. There are testosterone replacement therapies, however it is a good idea to consult your physician to see if they are safe.