Per Zirbel’s statement below, his A sample from the USA Professional TT Championships tested positive for exogenous DHEA. Zirbel then riding for the BISSELL team, finished second to claim the silver medal at the US Pro on August 29, 2009. He went on to represent the US at the World Championships where he set the fourth fastest time in the ITT.
While he awaits the results of the B sample, Zirbel released the following statement:
“I want to inform the cycling community that an ‘A’ sample of mine from a urine test conducted by USADA on Aug. 29, 2009 after the US Pro TT has tested positive for exogenous DHEA. I have not yet received notification from USADA on the findings of the ‘B’ sample, but I expect to receive word any day now. The US Pro TT was a major objective of mine this season, but I would never compromise my integrity for any bike race. At this point, I don’t know how this happened but regardless of the outcome of my ‘B’ sample I intend to find out with the help of a few accomplished scientists and doctors who have selflessly helped me since I first was notified of the ‘A’ findings. With that in mind, I refuse to speculate about how this happened until we have solid scientific evidence. I hate that this situation could and will probably bring more negative attention to our sport, but I am confident that we will find answers and I will be cleared of any wrongdoing. In the meantime, I ask for your understanding and respect while I fight for my career and reputation during this personal matter. ”
DHEA or Dehydroepiandrosterone is an endogenous steroid. Read more on wikipedia