Kenya's Olympic 800m bronze medal winner Margaret Nyairera Wambui, who has herself faced questions over her testosterone levels, on Thursday slammed an IAAF ruling against her rival Caster Semenya.

Semenya on Wednesday lost a court challenge against IAAF rules forcing women with elevated levels of testosterone to take suppressive treatment if they wish to compete as females in certain events. Wambui, who has often raced against the South African champion, has also faced questions over her testosterone levels, but unlike Semenya has not been forced to undergo tests for hyperandrogenism. "This life sometimes is so unfair", Wambui wrote on Twitter. "Everything that happens, happens with a reason Caster."