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Hi Mike, >> on diver safety. A sedentary person with a poor VO2 max (ability to >> transfer O2 throughout body) will have a safe single dive inside the limits >> of no stop diving, but should this same person do multiple dives, their >> ability to offgas will not keep pace with the model predictions. > >Now my understanding of deco theory mostly stops after the math, >and even then mostly only simple Haldanean, but when I see a statement >like this last one, I ask myself "if they offgas slowly, wouldn't they >also have ONgassed slowly as well?". Yes, they in-gas slower, but in-gassing and out-gassing work on different gradients. All the the tables are generated assuming equal ingassing for all divers, and in fact only calculating off-gass times for the various tissue groups. As you can see from repetitive dive tables, off-gassing does not keep pace with in-gassing, and in fact should be modified for an individual's gas exchange potential. This is why the obese, low VO2 max diver might be safer on a 60 for 60, but after a surface interval of an hour the gradients driving both the low VO2 max and high VO2 max divers have changed dramatically, now favoring the high VO2 max diver. .... Regards, Dan And if so, isn't likely >to turn into some kind of a proportional problem (ie. its all >a wash?). The only "hole" I see in this is that perhaps the model >should then include a "slower" tissue where it normally wouldn't >and would need to take into account the offgassing there. Maybe >I just answered my own question, but.... > >Just curious. Corrections, references welcome. Flames to /dev/null. > >Mike >-- >Mike Zimmerman < zimmmt@au*.al*.co* > Alcatel Network Sytems, Ral, NC >*My opinions, not Alcatel's* [\] NC Diving: http://www.vnet.com/scuba/ >A is A. Man who say it cannot be done should not interrupt man doing it. >-- >Send mail for the `techdiver' mailing list to `techdiver@terra.net'. >Send subscription/archive requests to `techdiver-request@terra.net'. > > Dan Volker SOUTH FLORIDA DIVE JOURNAL http://www.florida.net/scuba/dive 407-683-3592
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