Caster Semenya's appeal against testosterone regulations rejected

Challenges made by Caster Semenya and Athletics South Africa to IAAF regulations restricting testosterone levels in women runners in selected events have been dismissed, the Court of Arbitration for Sport has announced.

Caster Semenya has lost her legal battle with athletics’ world governing body the IAAF over its regulations restricting testosterone levels in women runners in selected events, the Court of Arbitration for Sport has announced.

Caster Semenya burst on to the global stage by winning gold at the 2009 World Champioships in Berlin (John Giles/PA).