Caster Semenya loses appeal against World Athletics testosterone regulations

Caster Semenya has vowed to continue her campaign despite another setback (Martin Rickett/PA)

Caster Semenya has lost her appeal to the Swiss Supreme Court against the World Athletics regulations which restrict testosterone levels in female athletes.

The South African was challenging the regulations which mean she is not allowed to compete in events between 400 metres and a mile without taking testosterone-suppressing drugs. They were upheld last year by the Court of Arbitration for Sport.