"Like many other sports‚ we choose to have two classifications for our competition – men’s events and women’s events.
"This means we need to be clear about the competition criteria for these two categories.
"Our evidence and data show that testosterone‚ either naturally produced or artificially inserted into the body‚ provides significant performance advantages in female athletes.
"The revised rules are not about cheating‚ no athlete with a DSD has cheated‚ they are about leveling the playing field to ensure fair and meaningful competition in the sport of athletics where success is determined by talent‚ dedication and hard work rather than other contributing factors.”
The IAAF's actions are seen by many as attempt to target South Africa’s double Olympic 800 metres champion Semanya.
Asked for a comment on these developments‚ Athletics South Africa president Aleck Skhosana said they were working on a statement that would be issued later on Thursday.