Why didn't marathon record times advance during early EPO era?



Interesting that the marathon records for both men and women show no
"blip" at the onset of the EPO era (which I take to have started
around 1990, shortly after it became commercially available):

http://www.marathonguide.com/history/records/

In contrast, the men's cycling hour record, to pick one arbitrary
measure, shot up during the mid-90s, as did lots of other measures of
top-level pro cyclists' performance. Any theories out there about the
absence of a similar phenomenon in marathon running? (I'm a bit
surprised to have not encountered any discussions about this on the
web--maybe I missed them in the archives?)--Shayana Kadidal
 

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