This is a very good question, IMO.
We know from other sports that training at altitude will produce acclimation to many of the O2-related challenges, but I don't know that acclimation is ever complete nor how well it would transfer to apnea performance at altitude. In addition, reduced atmospheric pressure per se would alter some physiological parameters that affect freediving performance, but the question is, to what extent?.
Dive tables have been adjusted for altitude, so it should be possible to develop an algorithm for approximating the differences that apply to freediving, and thus produce a correction factor for altitude, but I don't know if one already exists.
OK, so I've mused on the details of your question without giving you any help at all . . . now it's time for someone with some real knowledge on the subject to weigh in (I'm heading for my physiology and sports medicine reference texts for some help here - maybe I'll be back later).
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cjb
former DB Mentor; now just here to keep an eye on sven
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