Lower your testosterone or else – IAAF to DSD athletes

Kenya's Margaret Nyairera Wambui, Belarus' Maryna Arzamasava, Burundi's Francine Niyonsaba and South Africa's Caster Semenya compete in the Women's 800m Final during the athletics event at the Rio 2016 Olympic Games at the Olympic Stadium in Rio de Janeiro on August 20, 2016 [Courtesy]

Athletes with differences in sexual development (DSD) hoping to compete at the World Championships must submit to new rules curbing their levels of testosterone from Wednesday but Caster Semenya appears ready to resist the regulations.

Athletics chiefs had set a Wednesday deadline for DSD athletes to submit blood samples to their medical team with a testosterone level below five nanomoles per litre, which they must maintain over the next four-and-a-half months.