South African Caster Semenya, dogged by gender accusations since shooting to fame in 2009, has played down efforts by track and field's governing body to change rules on naturally occurring testosterone in female athletes.
Semenya is back in the spotlight following a study funded by the IAAF and the World Anti-Doping Agency (WADA) that showed female athletes with naturally high levels of testosterone enjoy a competitive advantage of up to 4.5 percent over their rivals.