For that to be true, you'd need to establish that blood oxygen levels differ significantly across altitude adapted individuals, and I don't believe that this is the case.
Also, when I first moved from Philadelphia to a village in New Mexico at 6000', I remember reading that I should plan on a 3 phase adapative process that would take as much as 9 months to complete. This makes me give less weight to things like the 2005 Marines study that Renshaw cites, which only continued for 90 days.
I should stress that I'm not doubting the statistics, just the proposed mechanism ("low oxygen air"). On the other hand, "varying ability to fully adapt to lower oxygen levels" seems more plausible.
Also, when I first moved from Philadelphia to a village in New Mexico at 6000', I remember reading that I should plan on a 3 phase adapative process that would take as much as 9 months to complete. This makes me give less weight to things like the 2005 Marines study that Renshaw cites, which only continued for 90 days.
I should stress that I'm not doubting the statistics, just the proposed mechanism ("low oxygen air"). On the other hand, "varying ability to fully adapt to lower oxygen levels" seems more plausible.