Indian sprinter Dutee Chand vowed Tuesday to fight any efforts to bar her from the sport, after new research showed runners born with high testosterone levels enjoy a "significant competitive advantage".
The 21-year-old was banned after being diagnosed in 2014 with hyperandrogenism -- a condition that causes high natural levels of the hormone in women.
She contested the ban and won a temporary reprieve from the Court of Arbitration for Sports (CAS) which allowed her to compete.
Without proof, the International Association of Athletics Federations (IAAF) regulations excluding women with hyperandrogenism from competition are set to lapse this year.
But the global body plans to submit the new research as evidence to back its case that they should remain in place.