What do the Ethiopian comparative studies show?
Researchers have directly compared runners training at Ethiopia's Guna Athletics Sport Club, at 3,100 meters, against those at the Ethiopian Youth Sport Academy in Addis Ababa, at 2,400 meters, tracking hematological markers and training characteristics between the two groups. The comparison reflects a broader pattern across Ethiopian training hubs, most of which sit between roughly 2,400 and 3,100 meters, giving athletes daily exposure that some coaches describe as effectively live-high, train-high, in contrast to the split-altitude model Levine and Stray-Gundersen studied in a lab setting. The two approaches, Kenya's more split model built around towns like Iten and Ethiopia's more continuous high-elevation exposure, have both produced world-record holders, which is itself a data point against any single mechanism being the whole explanation.
