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Caster Semenya, Testosterone and the History of Gender Segregation in Sports

South Africa's Caster Semenya looks on after running in the women's 1,500-meter race during the IAAF Diamond League athletics meeting Athletissima in Lausanne on July 5, 2018.
South Africa's Caster Semenya looks on after running in the women's 1,500-meter race during the IAAF Diamond League athletics meeting Athletissima in Lausanne on July 5, 2018.
(Image credit: ALAIN GROSCLAUDE/AFP/Getty Images)

A yearslong saga between a middle-distance runner and her sport's ruling body may be nearing something that resembles a conclusion.

In 2018, the International Association of Athletics Federations dictated that female runners with naturally occurring high testosterone levels and specific "differences of sex development" must lower their testosterone in order to compete in events ranging from 400 meters to one mile.

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Associate Professor of Kinesiology