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The presence of these ubiquitous steroids in a wide range of animals suggest that sex hormones have an ancient evolutionary history. This also made it obvious that additional modifications on the synthesized testosterone could be made, i.e., esterification and alkylation. These independent partial syntheses of testosterone from a cholesterol base earned both Butenandt and Ruzicka the joint 1939 Nobel Prize in Chemistry. The chemical synthesis of testosterone from cholesterol was achieved in August that year by Butenandt and Hanisch. They named the hormone testosterone, from the stems of testicle and sterol, and the suffix of ketone. Suffering the ridicule of his colleagues, he abandoned his work on the mechanisms and effects of androgens in human beings. In measurements of testosterone in blood samples, different assay techniques can yield different results.
5α-Reductase is highly expressed in the male reproductive organs (including the prostate gland, seminal vesicles, and epididymides), skin, hair follicles, and brain and aromatase is highly expressed in adipose tissue, bone, and the brain. Approximately 5 to 7% of testosterone is converted by 5α-reductase into 5α-DHT, with circulating levels of 5α-DHT about 10% of those of testosterone, and approximately 0.3% of testosterone is converted into estradiol by aromatase. In the hepatic 17-ketosteroid pathway of testosterone metabolism, testosterone is converted in the liver by 5α-reductase and 5β-reductase into 5α-DHT and the inactive 5β-DHT, respectively. An additional 40% of testosterone is metabolized in equal proportions into the 17-ketosteroids androsterone and etiocholanolone via the combined actions of 5α- and 5β-reductases, 3α-hydroxysteroid dehydrogenase, and 17β-HSD, in that order. Finally, increasing levels of testosterone through a negative feedback loop act on the hypothalamus and pituitary to inhibit the release of GnRH and FSH/LH, respectively. In addition, the amount of testosterone produced by existing Leydig cells is under the control of LH, which regulates the expression of 17β-hydroxysteroid dehydrogenase. The male generative glands also contain Sertoli cells, which require testosterone for spermatogenesis.
Training and special exercises cannot completely deprive the body of soft outlines and make the muscles more bulging. For an athlete who is fond of such types of physical culture as bodybuilding, powerlifting, power sports, it is important to have a beautiful figure with relief muscles. The specific duration of action is variable and is determined by the individual characteristics of the athlete's body. Its interaction with androgen receptors is extremely small. These are just two of the many actions exerted on the athlete's body. Testosterone is under development in a low-dose intranasal formulation for the treatment of anorgasmia in women.
Total levels of testosterone in the body have been reported as 264 to 916 ng/dL (nanograms per deciliter) in non-obese European and American men age 19 to 39 years, while mean testosterone levels in adult men have been reported as 630 ng/dL. When testosterone levels are low, gonadotropin-releasing hormone (GnRH) is released by the hypothalamus, which in turn stimulates the pituitary gland to release FSH and LH. Like other steroid hormones, testosterone is derived from cholesterol (Figure 1). Specific proteins include sex hormone-binding globulin (SHBG), which binds testosterone, dihydrotestosterone, estradiol, and other sex steroids. The same research found fathers (outside competitive environments) had the lowest testosterone levels compared to other males. Physical presence may be required for women who are in relationships for the testosterone–partner interaction, where same-city partnered women have lower testosterone levels than long-distance partnered women. Falling in love has been linked with decreases in men's testosterone levels while mixed changes are reported for women's testosterone levels.
Rats who were given anabolic steroids that increase testosterone were also more physically aggressive to provocation as a result of "threat sensitivity". Moreover, the conversion of testosterone to estradiol regulates male aggression in sparrows during breeding season. A few studies indicate that the testosterone derivative estradiol might play an important role in male aggression. One study found that administering testosterone increased verbal aggression in some participants.
Conflicting results have been obtained concerning the importance of testosterone in maintaining cardiovascular health. It has been theorized that brain masculinization is occurring since no significant changes have been identified in other parts of the body. The levels remain in a pubertal range for a few months, but usually reach the barely detectable levels of childhood by 4–7 months of age.
One such family of pharmacological steroids is the synthetic alkyl esters of testosterone, androgens with great hormonal potency. This is because abusing Testosterone esters will eventually cause the body to stop producing natural Testosterone, thus causing the levels to decrease naturally. Testosterone Phenylpropionate metabolizes into DHT, which is the most prevalent form of androgenic hormone in the body. It is important that this steroid be used in combination with other compounds, such as testosterone enanthate or cypionate.
In humans, testosterone appears more to promote status-seeking and social dominance than simply increasing physical aggression. Thus the link between testosterone and aggression and violence is due to these being rewarded with social status. This could explain why some studies find a link between testosterone and pro-social behaviour, if pro-social behaviour is rewarded with social status. One study proposed that natural selection may have caused men to be more sensitive to situations in which their status is challenged, and that testosterone is the key factor that causes these situations to spark into aggression. Studies have found higher pre-natal testosterone or lower digit ratio to be correlated with higher aggression. Testosterone and other androgens have evolved to motivate men to pursue competition, even when doing so leads to risk. Studies conducted have found direct correlation between testosterone and dominance, especially among the most violent criminals in prison who had the highest testosterone.
The reasons cited were limited efficacy (about one additional sexually satisfying event per month), concerns about safety and potential adverse effects with long-term therapy, and concerns about inappropriate off-label use. In 2003, the FDA rejected Intrinsa, a 300 μg/day testosterone patch for the treatment of sexual dysfunction in postmenopausal women. For this reason, and due to the unknown health effects and safety of testosterone therapy, its use may be inappropriate. Although testosterone has been found to be effective at improving sexual function in postmenopausal women, the doses employed have been supraphysiological. Testosterone therapy is effective in the short-term for the treatment of hypoactive sexual desire disorder (HSDD) in women. The FDA has required that labels on testosterone include warnings about increased risk of heart attacks and stroke. The United States Food and Drug Administration (FDA) stated in 2015 that neither the benefits nor the safety of testosterone supplement have been established for low testosterone levels due to aging.
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