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>Now, offgassing rates are less tied to straight blood flow and gradient than >is the ingassing rate, so this higher nitrogen saturation in the ultra-fit >diver, is not necessarily offgassed at the same volume per minute ratio as >would be predicted by the tables or even by the accelerated exchange rates >seen on ingassing....While still more vascular, the fit diver has nitrogen >saturation in tissues which will only release at a given rate, not tied as >directly to fitness level. >so in the first 50 foot and 40 foot stops, it would be sensible to conclude >the fit diver should take longer stops than the unfit, maybe even adding a >60 foot stop not needed by the unfit diver----better gas exchange in the fit >diver should allow better offgassing (relative to the unfit diver) so that >somewhere in the shallower stops (30, 20 , 10) , the fit diver will catch up >and then become less nitrogen saturated than the unfit divers. I should have added here that the sedentary or particulary overweight and lower VO2 Max divers, while probably being just fine at the 50 foot and 40 foot stops (for the profile mentioned above), may be far safer in extending their 30, 20, and particularly their 10 foot stops, beyond the table predicted time periods for each stop depth. And this is an area (that is, persons in the low VO2 max and/or heavily overweight area) where individualized gas exchange correction could make many persons engaged in technical diving considerably safer. Dan Dan Volker SOUTH FLORIDA DIVE JOURNAL "The Internet magazine for Underwater Photography and mpeg Video" http://www.florida.net/scuba/dive 407-683-3592
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