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The Olympic 800m champion
The Olympic 800m champion Caster Semenya could run up to seven seconds slower under new rules requiring her to lower her natural testosterone levels to race internationally, a prominent sports http://www.authenticnikeseahawkshop.com/12th-fan-jersey-for-sale-c-44.html scientist has predicted.

Under rules due to be announced on Thursday morning by the IAAF, the world athletics governing body, a separate female classification for an athlete with differences of sexual development (or DSDs) will be introduced. Such athletes, including Semenya, will have to reduce and then maintain their testosterone levels to no greater than 5nmol/L by 1 November if they want to compete in events ranging from 400 metres to a mile.

The International Association of Athletics Federations believes its new rules will “preserve fair and meaningful competition in the Oscar Lindberg Jersey female classification” because women Tre Boston Youth jersey athletes with high http://www.minnesotawildofficialonline.com/Adidas-Kyle-Quincey-Jersey testosterone have an advantage of up to 9% over women with normal levels of testosterone.
The move, which is sure to divide opinion, http://www.footballcowboysjerseys.com/brice-butler-jersey-for-sale-c-47.html was unanimously approved by the IAAF council last month. According to the world-renowned sports scientist Ross Tucker, the effect will be significant on athletes such as Semenya. “If this Womens Eddie Murray Jersey policy passes, then I would predict that Semenya will be five to seven seconds slower over 800 metres,” he wrote.
“The other really interesting thing is that, guided by the new IOC transgender policy that lowers the upper limit for testosterone to 5nmol/L, the IAAF are setting their limit at 5nmol/L. It used to be 10. That will slow the times of these athletes down even more than it did in the past.”
He told the Guardian: “History suggests Semenya will lose about four seconds to five seconds. Because in 2013 and 2014, when the IAAF were diligent about ensuring her compliance with the upper limit at that time (10nM), she was running 2:00. I don’t think she even qualified for the Commonwealth Games. Now, at 5nM, that effect will be even larger, I suspect. She will go from a 1:54 to 2:01-2:03, is my http://www.falconsauthenticofficialstore.com/adrian-clayborn-jersey_c-502.html estimate.”
Semenya burst on to the scene in 2009 when she won the world 800m title but was then required to take testosterone-suppressing medicine by the IAAF in order to compete. However, in July 2015 the court of arbitration for sport reversed that rule when it examined the Dutee Chand case – allowing inter-sex athletes to compete without taking testosterone-suppressing medication.
The decisive factor for the Cas panel in 2015 was whether testosterone above the 10nmol/L threshold set by the IAAF gave female athletes a competitive advantage over their fellow competitors. However research by the IAAF since then shows that in certain events testosterone does make an enormous difference. An IAAF report notes that “most females have low levels Carlos Ruiz Youth jersey of testosterone circulating naturally in their bodies (0.12 to 1.79 nmol/L in blood); while after puberty the normal male range is much higher (7.7 – 29.4 nmol/L). Absent a DSD or a tumour, no female would have serum levels of testosterone approaching 5 nmol/L, but individuals with DSDs can have very high levels of natural testosterone, extending into and even beyond the normal male range.”
The IAAF also makes it clear that science is on its side. In its report it writes: “There is a broad medical and scientific consensus that if these individuals are sensitive to androgens (ie, they have properly-functioning androgen receptors), such very high levels of natural testosterone .

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