IAAF hits back at Semenya to be classed as 'biological male' reports

The IAAF is to argue that Olympic women's 800m champion Caster Semenya should be classified as a "biological male" and forced to take testosterone suppressants if she is to compete in women's competition, according to reports.

Ahead of a landmark hearing at the Court of Arbitration (CAS) next week, The Times said that the IAAF will contest Semenya and other athletes with "differences of sexual development" (DSD) should only be able to compete with lower testosterone levels to ensure a level playing field.

However, the IAAF hit back at the "biological male" claims on Wednesday.

"The IAAF is not classifying any DSD athlete as male. To the contrary, we accept their legal sex without question, and permit them to compete in the female category," the IAAF said in a statement.

"However if a DSD athlete has testes and male levels of testosterone, they get the same increases in bone and muscle size and strength and increases in haemoglobin that a male gets when they go through puberty, which is what gives men such a performance advantage over women.

"Therefore, to preserve fair competition in the female category, it is necessary to require DSD athletes to reduce their testosterone down to female levels before they compete at international level."