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(USA Today) -- Lance Armstrong apologized to the staff of Livestrong Monday prior to an afternoon interview taping with Oprah Winfrey.

The Associated Press says disgraced cyclist Lance Armstrong confessed toOprah Winfrey in a television interview taped Monday that he did useperformance-enhancing drugs.

Livestrong spokesman Katherine McLane said it was a "very sincere and heartfelt apology to the staff."

Livestong, a charity based in Austin, Texas, was founded by Armstrong to provide support to cancer survivors. It has been entangled in the controversy surrounding Armstrong's cycling career during the last few years. In October, Armstrong was forced to step down from the Livestrong board after the U.S. Anti-Doping Agency released a massive file of detailed doping evidence against him.

Armstrong, 41, has denied doping for years. The Oprah interview is scheduled to air Thursday.

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