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Roderick Farb wrote: I may be missing the boat here but what I interpreted the original post to mean is that because you are diving at high altitude where O2 is limited, if you make your dive on an oxygen rich mixture, then upon returning to the surface and discarding your dive gear, you might become more hypoxic upon breathing ambient air. The rationale I suppose is that underwater with the enriched oxygen your body acclimates to it. When you surface and breath ambient air that has considerably less O2, increased hypoxia might occur. Well, I think I understand what is being asked, but as Carl said my common sense tells me that it shouldn't be that dramatic of a change. I feel that this is wrong, but can't explain it. Does anyone have experience with this or even an explaination of how the dramatic change creates hypoxia? Hypoxia is the deficencey of O2. How would your body become deficent after saturating it in greater O2 concentrations, then returning to a significantly lower concentration,but yet high enough not to be hypoxic air. Does it have to do with the sudden change of ppO2 in the lungs or what? Aloha Tony
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