"Dear IAAF, we cannot trust you anymore," Harting said in the English-language video posted on YouTube. "We have to act now."
Harting, a three-time world champion who won Olympic gold in London in 2012, has been a vocal critic of the International Association of Athletics Federations.
He declined to be considered for the IAAF's "Athlete of the Year" award in 2014 because he did not want to appear alongside candidates who have served doping bans, including U.S. Sprinter Justin Gatlin.
The media reports examined the results of 12,000 blood tests involving 5,000 athletes from 2001 to 2012, and concluded that 800 were suspicious. The reports said that 146 medals, including 55 golds, in disciplines ranging from the 800 meters to the marathon at the Olympics and world championships were won by athletes who have recorded suspicious tests.
Harting's girlfriend, discus thrower Julia Fischer, holds up a handwritten message saying: "You broke my childhood dreams."
"You put money over athletes," says hammer thrower Kathrin Klaas, while 800-meter runner Robin Schembera adds: "I want to run against clean athletes, not monsters." Harting concludes with the message, "You betrayed my beliefs." The athletes say they demand "honesty, integrity, transparency."
They hold up signs with (hashtag) hitIAAF.
The doping reports were published ahead of this month's world championships in Beijing, which the IAAF said is "causing stress and confusion" for athletes.
The IAAF hit back at two scientists whose findings led to allegations this week of widespread doping in the sport, saying Saturday that their assertions are "seriously incorrect."
In a scathing statement, the IAAF said the two Australian anti-doping scientists, Michael Ashenden and Robin Parisotto, were wrong to claim that the governing body didn't act on suspicious blood profiles and "had no knowledge whatsoever of the actions taken by the IAAF.
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