Great article about how “muscle and gene memory” are created, how they function, and how their memory can stay active up to about ten years even after the fitness has faded one study claims, now if you add PEDs to the formula while training, the article argues that your muscle and gene memory are built while on PEDs, so year or two later you start training w/o PEDs then in theory you are activating the memories you built while on PEDs and hence advantage dopers who no longer dope (putting physical fitness aside).

I don’t have a problem believing the theory of building muscle and gene memory, as every spring it takes me about three to four rides to be able to ride eighty miles in about four hours without pain, whereas it may take an entire season for novice rider, so that part is kind of self-explanatory, it’s the second part that has me on the fence. Great read thou nonetheless, it makes you think.  

http://velonews.competitor.com/2014/02/training-center/an-analysis-of-the-long-term-effects-of-performance-enhancing-drugs_317590