The Court of Arbitration for Sport has dismissed an appeal by Olympics 800 metres champion Caster Semenya against the introduction of regulations to restrict testosterone levels in female athletes.
The court ruled that regulations were needed for athletes with differences in sexual development to ensure fair competition.
The rules cover events ranging from 400m to a mile.
The case is likely to have wide-reaching consequences, not just for the future of athletics, but all women’s sport, and has split opinion around the globe.
But while dismissing the appeal, Court of Arbitration for Sport also voiced concerns about the application of the new International Association of Athletics Federations regulations.
The rules mean Semenya and others with DSD hoping to compete at the Doha World Championships in September would have to start taking medication to lower their testosterone levels within one week.
Semenya has said she does not wish to undergo medical intervention to change who she is and how she was born, and wants to compete naturally.
