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Mark Welzel writes about discussing practical levels of ppO2. I will start things rolling. Mark does the bulk of his diving on cold water East Coast wrecks. Here in Great Lakes country, the situation is the same. The feeling here seems to be that 1.4 ata of Q2 at maximum operating depth is tops for anything but very brief exposures, and that 1.2 or 1.3 represents a more supportable level in cold water under moderate work stress. These figures are based on no emphirical evidence, just a shot in the dark extrapolation from data which generally speaking comes from testing in conditions that bear little resemblance to those we dive under. This is all hit and miss stuff. The recent accident in Wisconsin may have been caused by any number of things...assuming the poor bastard was used to being narced outta his tree, could the increased thermal stress have accelerated CNS clock loading for instance? I do not want to start playing armchair coroner, but do feel this is one point worth throwing out for debate...given that doing deep air dives seems to be in vogue again. Thoughts? Also, is anyone aware of studies either done or underway which look at the effects of diet, physical condition (not just aerobic conditioning), on CNS effects. And have tests been carried out to see if chronic O2 toxicity is controlled at all by loading subjects up on anti-oxidants? Regards ----------------------------------------------------------------------------- Internet: steve.lewis@pr*.or* (Steve Lewis) This message lovingly processed in beautiful Muskoka, Ontario, Canada by: PrimeTime BBS - (705)689-1757 -----------------------------------------------------------------------------
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