Caster Semenya said “no human can stop me from running” after winning the 800m at the Doha Diamond League meet amid speculation over her future.
It comes just two days after the South African, 28, lost a landmark case against athletics’ governing body.
Semenya challenged IAAF rules designed to limit testosterone levels in female runners but the Court of Arbitration for Sport (Cas) rejected her appeal.
“Actions speak louder than words,” Semenya told BBC Sport.
“When you are a great champion, you always deliver.
“It’s up to God, God has decided my life, God will end my life, God has decided my career, God will end my career. No man, or any other human, can stop me from running.”
Under the new IAAF rules Semenya – and other athletes with differences of sexual development (DSD) – must either take medication in order to compete in track events from 400m to the mile, or change to another distance.