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AAS have been used by men and women in many different kinds of professional sports to attain a competitive edge or to assist in recovery from injury.These sports include bodybuilding, weightlifting, shot put and other track and field, cycling, baseball, wrestling, mixed martial arts, boxing, football, and cricket.are steroidal androgens that include natural androgens like testosterone as well as synthetic androgens that are structurally related and have similar effects to testosterone.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 the vocal cords and body hair."Among 12- to 17-year-old boys, use of steroids and similar drugs jumped 25 percent from 1999 to 2000, with 20 percent saying they use them for looks rather than sports, a study by insurer Blue Cross Blue Shield found."(Eisenhauer) Another study found that non-medical use of AAS among college students was at or less than 1%.According to a recent survey, 78.4% of steroid users were noncompetitive bodybuilders and non-athletes, while about 13% reported unsafe injection practices such as reusing needles, sharing needles, and sharing multidose vials, Another 2007 study found that 74% of non-medical AAS users had post-secondary degrees and more had completed college and fewer had failed to complete high school than is expected from the general populace.The most commonly used AAS in medicine are testosterone and its various esters (but most commonly testosterone undecanoate, testosterone enanthate, testosterone cypionate, and testosterone propionate), Others also available and used commonly but to a lesser extent include methyltestosterone, oxandrolone, mesterolone, and oxymetholone, as well as drostanolone propionate, metenolone (methylandrostenolone), and fluoxymesterone.

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A number of severe side effects can occur if adolescents use AAS.These derivatives are hydrolyzed to release free testosterone at the site of injection; absorption rate (and thus injection schedule) varies among different esters, but medical injections are normally done anywhere between semi-weekly to once every 12 weeks.A more frequent schedule may be desirable in order to maintain a more constant level of hormone in the system.Conditions pertaining to hormonal imbalances such as gynecomastia and testicular size reduction may also be caused by AAS.[citation needed] Ergogenic uses for AAS in sports, racing, and bodybuilding as performance-enhancing drugs are controversial because of their adverse effects and the potential to gain unfair advantage in physical competitions.Their use is referred to as doping and banned by most major sporting bodies.The word anabolic, referring to anabolism, comes from the Greek ἀναβολή anabole, "that which is thrown up, mound." They are one of three types of sex hormone agonists, the others being estrogens like estradiol and progestogens like progesterone.