It is significant for the discussion that Kenya’s recent performance improvements have coincided with global time improvements, the leaders aren’t trailblazing outliers but have carried the world with them. See the all time progression lists in the marathon, or consider Euro-American NRs alongside Kipyegon’s summer exploits for example. This isn’t East Germany’s regime or Ma’s army.
Alternative explanations include widespread global juicing, clubbing, more disciplined training regimes, shoe technology, race organisation and so on. There’s just no evidence situating collective Kenyan results vis a vis other countries as especial and therefore obviously linked to PEDs. It may even be deduced that Kenyan sport is cleaner now than in the past when the country was more dominant.
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Again, I say this as someone who sees the evidence that there is intense even if not systematic doping over there. I agree that it matters that lower tier athletes are doping in this back alley way; especially for the threat to their health.
I think a sociological analysis for this spike in individualised doping is possible - capitalist individualist entrepreneurialism - is persuasive. Greater prize money in a much more open and competitive East Africa that is at once vastly richer but much more intensely unequal makes it so PED salespeople are meeting more agreeable clients who know from others that PEDs work.