BotanyBay said:
You talk about doping as if they choose which races to "dope for". Can you do a shot of EPO the night before an event and get an advantage? Sure. But most riders are on doping PROGRAMS. They do it to attain a higher level of fitness for a really long period of time.
Assume that if they're dopers, they're doping for much (if not most) of the season. The doping allows them to get a much higher overall fitness level.
I think you're both right and wrong. I agree that doping is generally carried out on a program, which the rider has to adhere to for most of the season. I rather doubt that in this era, riders pop something just for one race.
But being on a program does not equate to being at a competitive advantage in every race. For example, blood doping for most riders probably involves withdrawing blood periodically during the season, storing it for a few weeks, then re-infusing it. Immediately after withdrawal, a rider is not at an advantage; on the contrary, he is weaker than normal, though the use of EPO may minimize the time it takes for the lost red cells to be replaced.
Presumably, riders attempt to plan their season so that when they are not at an advantage, they aren't racing. If you have a withdrawal scheduled for a certain date, you probably won't race any time soon after that date. But this withdrawal/infusion schedule is hard to set up so that you will always be at your best. The idea is to transfuse for a small number of races that are of major importance. You might still enter other races without the benefit of a transfusion. Maybe in those circumstances you would take some EPO, but not necessarily. Depending on where you are in the transfusion/infusion cycle, the needs of passing passport tests, and other factors, it might not be practical to dope at all for certain races.
For example, immediately after a withdrawal of blood, the body boosts production of endogenous EPO to stimulate synthesis of red cells to replace the lost ones. You could further accelerate this process by taking synthetic EPO. but in doing so you run the risk of failing a passport test. Just by withdrawing blood, you significantly alter your mature cell/reticulocyte ratio, and taking EPO would further skew that.
I only know what I have heard others claim about this process, but my understanding is that if you're on a full program, everything is set up so you will be at your best at just a handful of critical times during the season. What you do the rest of the time has to be determined by the goal of getting ready for those dates, not by the need to do well in some secondary race that you have to enter, or want to enter.