Quote:
Originally Posted by Dewit2it
I found an underwater model advocating the use of pure O2 for breath hold dives. She says she can increase her hold times from 3 min on air to 6 min on O2. I hope someone stops and explains to her O2 toxicity.
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Well, it depends in what depth she makes the modeling. Such shots are usually made in just few meters of water, so the risk of serious poisoning may be negligible unless it takes many dives and long time underwater in total. A more serious risk than oxygen poisoning in this case is rather CO2 acidosis - by prolonging the breath-holds she produces more CO2. But seeing she makes no extreme long dives, and assuming she ventilates between the dives long enough, the risk is probably also manageable.
So, I'd tell that breathing pure oxygen is certainly not without risks, but in this very case it may be justifiable. She should just avoid doing it too often or for too long time (and of course too deep too) - pure oxygen and especially the free radicals it brings with, are rather aggressive to the organism. Besides the toxicity, it also damages tissue, and accelerates aging. I bet that if you mention it to her, as a model depending on her look, she will be certainly much more scared by the aging than the poisoning
