New IAAF testosterone rules could slow Caster Semenya by up to seven seconds

• IAAF set to introduce new limits for female athletes
• Sports scientist: ‘She will go from a 1:54 to 2:01-2:03’ in 800mThe Olympic 800m champion Caster Semenya could run up to seven seconds slower under new rules requiring her to lower her natural testosterone levels to race internationally, a prominent sports scientist has predicted.Under rules due to be announced on Thursday morning by the IAAF, the world athletics governing body, a separate female classification for an