(CNN) -- Cyclist Floyd Landis has acknowledged using performance-enhancing drugs for most of his career after disputing for years a positive doping test result that led to his suspension from the sport, two news organizations reported on Thursday.
Landis also sent e-mails saying that other cyclists have used performance-enhancing drugs, including Lance Armstrong, the American seven-time Tour de France winner, one of the news outlets reported.
Armstrong has repeatedly denied taking such drugs. He told reporters on Thursday: "We have nothing to hide. We have nothing to run from," and said Landis has been threatening him and others for years.
ESPN.com reported that Landis said in an interview that he consistently used the red blood cell booster erythropoietin, commonly known as EPO, along with testosterone and the human growth hormone and that he received frequent blood transfusions.
He also used female hormones and, once, insulin, ESPN.com reported. He is coming forward now because years of deceit have taken a toll on him, the site quoted him as saying.
Pat McQuaid, president of the International Cycling Union, told CNN on Thursday he was "very annoyed and very angry" after hearing of Landis' revelations.
"It just seems to be one last roll of the dice from a very desperate man," McQuaid said.
Landis sent e-mails to cycling and anti-doping officials recently that implicate dozens of other athletes in such activities, ESPN.com and The Wall Street Journal reported.
The Wall Street Journal reported it had seen three of the e-mails, dated between April 30 and May 6, and that officials with USA Cycling and the International Cycling Union were copied on them. >>>
