Latter I reckon. ie. at what stage of human history did Kenyan runners actually get the ability to compete on the world stage? They didn't just suddenly become great distance runners but they did quite rapidly get the opportunity to travel overseas and make money from being great distance runners.
That helps but EPO didn't turn donkeys into race horses. It just turned race horses into faster race horses.. that might die in the middle of the night.
Latter I reckon. ie. at what stage of human history did Kenyan runners actually get the ability to compete on the world stage? They didn't just suddenly become great distance runners but they did quite rapidly get the opportunity to travel overseas and make money from being great distance runners.