Originally Posted by Tyburn
They believe that it depends on weather your body can mimick successfully ...
It's "whether." You regularly use "weather" in a conditional statement. "Weather" is meteorological. Welcome to my peeve.
The other reason athletes might do poorly at high elevation is the lowered gravity field. They may not be accustomed to aging so quickly, as time passes faster in a lower-gravity frame of reference. Since higher elevations are further from Earth's center of gravity, the gravity is lessened up here and we all age a little faster than you low-lying ones (um, Morlocks?). Anyway, we're accustomed to the excess speed at which we age way up here.
(Yes, I'm being goofy; don't anyone freak out.)