The bones and the brain are two important tissues in humans where the primary effect of testosterone is by way of aromatization to estradiol. Both the free fraction and the one bound to albumin are available at the tissue level (their sum constitutes the bioavailable testosterone), while SHBG effectively and irreversibly inhibits the action of testosterone. At the tissue level, testosterone dissociates from albumin and quickly diffuses into the tissues. This binding plays an important role in regulating the transport, tissue delivery, bioactivity, and metabolism of testosterone. As a result, testosterone which is not bound to SHBG is called free testosterone. The part of the total hormone concentration that is not bound to its respective specific carrier protein is the free part.
Two of the immediate metabolites of testosterone, 5α-DHT and estradiol, are biologically important and can be formed both in the liver and in extrahepatic tissues. Certain cytochrome P450 enzymes such as CYP2C9 and CYP2C19 can also oxidize testosterone at the C17 position to form androstenedione. In addition to 6β- and 16β-hydroxytestosterone, 1β-, 2α/β-, 11β-, and 15β-hydroxytestosterone are also formed as minor metabolites.
TUEs for the use of testosterone can only be approved in special exceptional cases. It must be proven that there is a documented testosterone deficiency, originating from an organic cause. More information on the consequences of doping with anabolic androgenic steroids can also be found on GEMEINSAM GEGEN DOPING
However, the testosterone changes observed do not seem to be maintained as relationships develop over time. There has been speculation that these changes in testosterone result in the temporary reduction of differences in behavior between the sexes. Testosterone may be a treatment for postmenopausal women as long as they are effectively estrogenized.
The American sprinter Helen Stephens won the gold medal, and was subject to an impromptu genital examination by the Olympic committee, which judged her to be female. Due to high androgens in circulation, 5a-reductase deficiency in an XY athlete competing as a woman would provide a competitive advantage. Individuals with 5a-reductase deficiency lack the ability to convert testosterone to DHT (Houk et al, 2005). In 1985, the Spanish hurdler Maria Jose Martinez-Patino was blocked from competition at the World University Games due to AIS (Martinez-Patino, 2005). XY individuals with AIS have a defect in the androgen receptor, rendering them insensitive to their own testicular androgens (see Hiort and Zitzmann, 2004). Lacking the ability to generate cortisol or aldosterone, their precursors accumulate in the adrenal and are converted to androgens.
In 1950, sprinter Foekje Dillema was expelled 1950 from the Dutch national team and banned from international competition following a gynecologic exam. Typically, individuals with Turner's or Klinefelter's syndrome are hypogonadal, which is not a competitive advantage in sport. Individuals may have only one sex chromosome (Turner's syndrome), or sometimes three or four Klinefelter's syndrome (XXY) is the most common example; Bojesen and Gravholt (2007). DSD may include alterations in the complement of sex chromosomes, as well as defects in the production, metabolism or binding capacity of sex steroid hormones produced by the gonads. Accordingly, the distinction of male or female sex applies to all animals, but only humans can be said to have gender. Sex is a biologic definition that distinguishes male and female; gender is the sense of one's own self as a man or woman (see Wilson, 2000). DSD is often confused with "intersex", referring to conditions where the external genitalia do not conform to the standards of either male or female (Ritchie et al, 2008).

Gender: Female

Social links