"I find it very motivating that the world governing body is committed to making the sport of Athletics as clean as possible."
The IAAF said the re-testing was part of its "strategic anti-doping policy", using up-to-date analytical techniques to re-analyse samples taken in 2005.
"The IAAF's message to cheaters is increasingly clear that, with constant advancements being made in doping detection, there is no place to hide.
"This re-testing is just the latest example of the IAAF's firm resolve to expose cheating in our sport," IAAF president Lamine Diack said in a statement.
"The IAAF will continue to do everything in its power to ensure the credibility of competition, and where the rules have been broken, will systematically uncover the cheats."
Disciplinary procedures are underway for the disgraced athletes, and the IAAF would not make any further comment until they were completed, said the statement.
- nzherald.co.nz and APNZ