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it seems to me that if you want to say that oprah or the hoard running marathons are slowing down the sport you really should look only at the top times. how are those changing? are the top marathon runners the US is sending to international competitions getting better or worse? i would imagine if you go from 250 fairly elite, good runners to thousands of runners of all skill levels the average time will decrease. the article just keeps talking about the average american time -- is this any american who runs a marathon or just the top group for whom the marathon is an actual competition? perhaps the trend down still holds, perhaps not, but just make sure you are comparing apples with apples, not potatoes.