The South African challenged the IAAF's ruling to restrict levels of testosterone in female athletes

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).

The South African challenged the IAAF's ruling to restrict levels of testosterone in female athletes

The two-time Olympic 800m champion and Athletics South Africa had claimed the rules, which would force athletes with naturally occurring high levels of testosterone to take medication to lower them, were unlawful

As a female athlete, I thought high testosterone was a problem. Now I realise this is an outdated and indefensible position

Double Olympic 800m champion Caster Semenya has won her final race over the distance before controversial new IAAF testosterone regulations come into place.