Semenya loses court challenge against IAAF testosterone rules

South African runner Caster Semenya on Wednesday lost her court challenge against IAAF rules forcing female athletes to regulate their testosterone levels, but judges voiced concern with the application of the "discriminatory" regulations.

Semenya, a double Olympic champion, was fighting measures imposed by the International Association of Athletics Federations (IAAF) that compel "hyperandrogenic" athletes -- or those with "differences of sexual development" (DSD) -- to lower their testosterone levels if they wish to compete as women.

A three judge panel at the Court of Arbitration for Sport said it had "some serious concerns as to the future practical application of these DSD regulations."
The IAAF has countered that DSD athletes with male levels of testosterone "get the same increases in bone and muscle size and strength and increases in haemoglobin that a male gets when they go through puberty."