Anabolt steroid - Wikipedia, den frie encyklopædi

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Larry; De Groot, Leslie J. The AAS, whether of endogenous or exogenous origin, are subject to extensive hepatic biotransformation by a variety of enzymatic pathways. For androgens as natural hormones, see Androgen. United States Food and Drug Administration. Changes in endogenous testosterone levels may also contribute to differences in myotrophic—androgenic ratio between testosterone and synthetic AAS. Most steroid users are not athletes.

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British Journal of Pharmacology. In response to the success of Russian weightlifters, the U. Medical use of testicle extract began in the late 19th century while its effects on strength were still being studied. Known possible side effects of AAS include: They are anabolic and increase protein within cells , especially in skeletal muscles , and also have varying degrees of androgenic and virilizing effects, including induction of the development and maintenance of masculine secondary sexual characteristics such as the growth of facial and body hair. The new steroid was approved for use in the U. AAS were synthesized in the s, and are now used therapeutically in medicine to stimulate muscle growth and appetite , induce male puberty and treat chronic wasting conditions, such as cancer and AIDS.

The VP weight is an indicator of the androgenic effect, while the LA weight is an indicator of the anabolic effect. Two or more batches of rats are castrated and given no treatment and respectively some AAS of interest. Animal studies also found that fat mass was reduced, but most studies in humans failed to elucidate significant fat mass decrements. The effects on lean body mass have been shown to be dose-dependent.

Both muscle hypertrophy and the formation of new muscle fibers have been observed. The hydration of lean mass remains unaffected by AAS use, although small increments of blood volume cannot be ruled out.

The upper region of the body thorax, neck, shoulders, and upper arm seems to be more susceptible for AAS than other body regions because of predominance of ARs in the upper body.

After drug withdrawal, the effects fade away slowly, but may persist for more than 6—12 weeks after cessation of AAS use. Overall, the exercise where the most significant improvements were observed is the bench press. The measurement of the dissociation between anabolic and androgenic effects among AAS is based largely on a simple although arguably unsophisticated and outdated model involving rat tissue bioassays.

The intracellular metabolism theory explains how and why remarkable dissociation between anabolic and androgenic effects can occur despite the fact that these effects are mediated through the same signaling receptor, and of course why dissociation is invariably incomplete.

An animal study found that two different kinds of androgen response elements could differentially respond to testosterone and DHT upon activation of the AR. Changes in endogenous testosterone levels may also contribute to differences in myotrophic—androgenic ratio between testosterone and synthetic AAS. Testosterone can be metabolized by aromatase into estradiol , and many other AAS can be metabolized into their corresponding estrogenic metabolites as well.

The major effect of estrogenicity is gynecomastia woman-like breasts. AAS are androstane or estrane steroids. As well as others such as 1-dehydrogenation e. The most commonly employed human physiological specimen for detecting AAS usage is urine, although both blood and hair have been investigated for this purpose.

The AAS, whether of endogenous or exogenous origin, are subject to extensive hepatic biotransformation by a variety of enzymatic pathways. The primary urinary metabolites may be detectable for up to 30 days after the last use, depending on the specific agent, dose and route of administration.

A number of the drugs have common metabolic pathways, and their excretion profiles may overlap those of the endogenous steroids, making interpretation of testing results a very significant challenge to the analytical chemist. Methods for detection of the substances or their excretion products in urine specimens usually involve gas chromatography—mass spectrometry or liquid chromatography-mass spectrometry.

The use of gonadal steroids pre-dates their identification and isolation. Medical use of testicle extract began in the late 19th century while its effects on strength were still being studied. In the s, it was already known that the testes contain a more powerful androgen than androstenone , and three groups of scientists, funded by competing pharmaceutical companies in the Netherlands, Germany, and Switzerland, raced to isolate it.

The chemical synthesis of testosterone was achieved in August that year, when Butenandt and G. Wettstein, announced a patent application in a paper "On the Artificial Preparation of the Testicular Hormone Testosterone Androstenoneol. Clinical trials on humans, involving either oral doses of methyltestosterone or injections of testosterone propionate , began as early as Kennedy was administered steroids both before and during his presidency.

The development of muscle-building properties of testosterone was pursued in the s, in the Soviet Union and in Eastern Bloc countries such as East Germany, where steroid programs were used to enhance the performance of Olympic and other amateur weight lifters. In response to the success of Russian weightlifters, the U. The new steroid was approved for use in the U. It was most commonly administered to burn victims and the elderly.

The drug's off-label users were mostly bodybuilders and weight lifters. Although Ziegler prescribed only small doses to athletes, he soon discovered that those having abused Dianabol suffered from enlarged prostates and atrophied testes.

Three major ideas governed modifications of testosterone into a multitude of AAS: The legal status of AAS varies from country to country: Unlawful distribution or possession with intent to distribute AAS as a first offense is punished by up to ten years in prison.

Those guilty of buying or selling AAS in Canada can be imprisoned for up to 18 months. In Canada, researchers have concluded that steroid use among student athletes is extremely widespread. A study conducted in by the Canadian Centre for Drug-Free Sport found that nearly 83, Canadians between the ages of 11 and 18 use steroids. AAS are readily available without a prescription in some countries such as Mexico and Thailand. The history of the U. The same act also introduced more stringent controls with higher criminal penalties for offenses involving the illegal distribution of AAS and human growth hormone.

By the early s, after AAS were scheduled in the U. In the Controlled Substances Act, AAS are defined to be any drug or hormonal substance chemically and pharmacologically related to testosterone other than estrogens , progestins , and corticosteroids that promote muscle growth. The act was amended by the Anabolic Steroid Control Act of , which added prohormones to the list of controlled substances , with effect from January 20, In the United Kingdom, AAS are classified as class C drugs for their illegal abuse potential, which puts them in the same class as benzodiazepines.

Part 1 drugs are subject to full import and export controls with possession being an offence without an appropriate prescription. There is no restriction on the possession when it is part of a medicinal product.

Part 2 drugs require a Home Office licence for importation and export unless the substance is in the form of a medicinal product and is for self-administration by a person.

Many other countries have similar legislation prohibiting AAS in sports including Denmark, [] France, [] the Netherlands [] and Sweden. United States federal law enforcement officials have expressed concern about AAS use by police officers.

It's not that we set out to target cops, but when we're in the middle of an active investigation into steroids, there have been quite a few cases that have led back to police officers," says Lawrence Payne, a spokesman for the United States Drug Enforcement Administration.

Following the murder-suicide of Chris Benoit in , the Oversight and Government Reform Committee investigated steroid usage in the wrestling industry. The documents stated that 75 wrestlers—roughly 40 percent—had tested positive for drug use since , most commonly for steroids. AAS are frequently produced in pharmaceutical laboratories, but, in nations where stricter laws are present, they are also produced in small home-made underground laboratories, usually from raw substances imported from abroad.

As with most significant smuggling operations, organized crime is involved. In the late s, the worldwide trade in illicit AAS increased significantly, and authorities announced record captures on three continents.

In , Finnish authorities announced a record seizure of A year later, the DEA seized In the first three months of , Australian customs reported a record seizures of AAS shipments. Illegal AAS are sometimes sold at gyms and competitions, and through the mail, but may also be obtained through pharmacists, veterinarians, and physicians.

AAS, alone and in combination with progestogens , have been studied as potential male hormonal contraceptives. From Wikipedia, the free encyclopedia. This article is about androgens as medications. For androgens as natural hormones, see Androgen. Ergogenic use of anabolic steroids. Use of performance-enhancing drugs in sport.

Illegal trade in anabolic steroids. Pharmacy and Pharmacology portal. British Journal of Pharmacology. Houglum J, Harrelson GL, eds. Principles of Pharmacology for Athletic Trainers 2nd ed. Int J Sports Med. Mini Rev Med Chem. Anabolic-androgenic steroid therapy in the treatment of chronic diseases". Clinics in Endocrinology and Metabolism. Pharmacology Application in Athletic Training.

Clinical Guidelines for Prevention and Treatment. Royal College of Physicians. Anabolic Steroids and the Athlete, 2d ed. Do testosterone injections increase libido for elderly hypogonadal patients? Retrieved November 17, Retrieved December 5, Freter 30 July Perry's The Chemotherapy Source Book. J Womens Health Larchmt. Results from four national surveys".

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Journal of Sports Science and Medicine. Archived PDF from the original on 20 June A secret program of the German Democratic Republic government". Lay summary — ScienceDaily October 30, A Looming Public Health Concern?

Annals of Clinical Psychiatry. What the psychiatrist needs to know". Advances in Psychiatric Treatment. Br J Sports Med. Archived from the original on And Other Performance-enhancing Drugs. Am J Public Health.

Archived from the original on 10 July J Acquir Immune Defic Syndr. Retrieved 2 January Proceedings of the Society for Experimental Biology and Medicine. The New England Journal of Medicine. Penn Clinical Manual of Urology. Protective Effects of Tea on Human Health. Therefore, it is possible that a selective androgen response element sequence may play a role in differential T vs. Although both testosterone and dihydrotestosterone activate the same androgen receptor, differences in the sequence of androgen response elements are responsible for differential regulation of these hormones Int J Mol Sci.

Bilezikian; Dirk Vanderschueren 30 November The Effects of Gender on Skeletal Health. Brocklehurst's Textbook of Geriatric Medicine and Gerontology. Regulation of the secretion of GnRH, FSH, and LH occurs partially by the negative feedback of testosterone and estradiol at the level of the hypothalamo-pituitary. Estradiol has a much larger, inhibitory effect than testosterone, being fold more effective in suppressing LH secretion [57—61].

Androgens, estrogens and progestins exert a negative feedback effect on the secretion of GnRH and LH by their actions on the pituitary and the hypothalamus. Most of the negative feedback effect of androgens is caused by their estrogenic metabolites produced by aromatization. Rittmaster et al, ; Kumar et al, a; Hayes et al, There are known cases of doping in sports with trenbolone esters by professional athletes.

From Wikipedia, the free encyclopedia. Not to be confused with Trestolone. Elks 14 November The Dictionary of Drugs: Chemical Data, Structures and Bibliographies. Hall 6 December Concise Dictionary of Pharmacological Agents: British Journal of Pharmacology. A Feedlot Effluent Contaminant".

A potent anabolic steroid with reduced androgenic and estrogenic activity". The Journal of endocrinology. Advances in Environmental Biology. Topics in Human Reproductive Ecology. McKerns 13 March Reproductive Processes and Contraception. United States Food and Drug Administration.

Retrieved 17 June Androstanolone stanolone, dihydrotestosterone, DHT Androstanolone esters Bolazine capronate Drostanolone propionate dromostanolone propionate Epitiostanol Mepitiostane Mesterolone Metenolone acetate methenolone acetate Metenolone enanthate methenolone enanthate Stenbolone acetate Nortestosterone derivatives: Bolandiol dipropionate Nandrolone esters e.

Danazol Gestrinone Progestins e. D 2 receptor antagonists prolactin releasers e. Androvax androstenedione albumin Ovandrotone albumin Fecundin.

Iamges: anabole steroide wikipedia

anabole steroide wikipedia

D 2 receptor antagonists prolactin releasers e.

anabole steroide wikipedia

The same act also introduced more stringent controls with higher criminal penalties for offenses involving the illegal distribution of AAS and human growth hormone. Long-term steroid abusers may develop symptoms of dependence and withdrawal on discontinuation of AAS".

anabole steroide wikipedia

Androvax androstenedione albumin Ovandrotone albumin Fecundin. Eisenhauer L Nov 7, Archived PDF from the original on 20 June The mechanism of these ateroide reactions could not be explained by demographic, psychological, laboratory, or physiological anabole steroide wikipedia. United States federal law enforcement officials have expressed concern about AAS anabole steroide wikipedia by police officers. Perry's The Chemotherapy Source Book. A secret program of the German Democratic Republic government".