Olympic 800-metres champion Caster Semenya has had an appeal dismissed by the Court of Arbitration for Sport (CAS) to halt the introduction of regulations to limit testosterone in female athletes with differences in sexual development (DSDs). CAS ruled on Wednesday that the International Association of Athletics Federations (IAAF) regulations are needed to ensure fair competition between athletes who compete in events ranging from 400-metres to a mile, previously calling the hearing one of the most important ever to appear before the court. It means that Semenya and other affected athletes hoping to compete at the World Championships in Doha in September would have to start taking medication to lower their testosterone level to below the required five (5) nmol/L within one week. It is a special concession made by the IAAF due to the length of time it has taken CAS to reach a verdict. However, in future athletes will be required to have reduced their blood testosterone level to below...

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