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False conclusion - you need to add these words "if they stay at it for three days before their dive" - not real life, Mike, unless you want to carry a chanmber, get smoked up in the chamber on air for three days, then do your dive, and then it is only , as you pooint out, subjective, and as I keep harping over and over , that subjectivity is based on the impaired brain, and that is why we think of it the way we do. Mike if this were not true, NOBODY woud ever drive a car drunk - they would decide not to do so. Michael J. Black wrote: > > --- PVanscoik@ao*.co* wrote: > > Dr. Black, > > i would love to see some real data - repeat hyperbaric chamber dives > > on the same cohort & test scores. are we debating facts or opinions? > > Peter, > > Here's some real data, albeit a small study, from the Journal of > Undersea and Hyperbaric Medicine 1995 Mar;22(1):41-9 Dissociation of > the Behavioral and Subjective Components of Nitrogen Narcosis and Diver > Adaptation, by Hamilton K, Laliberte MF, Fowler B (DCIEM): Abstract: > > We investigated adaptation to nitrogen narcosis by compressing 11 highly > experienced divers in a hyperbaric chamber to the equivalent of 54.6 > meters of seawater once a day for 5 consecutive days. The behavioral > component of narcosis was assessed with a serial choice-reaction time > (RT) task, and the subjective component with a global magnitude estimate. > Supplementary magnitude estimates were obtained with adjectives describing > work effectiveness and body sensations. The results showed that there > was no adaptation on the RT task, although learning was evident. In > contrast, the global estimate dissociated from RT and showed clear adap- > tation by Day 3. The work effectiveness adjectives followed RT and did > not show adaptation. Some body sensation adjectives showed clear > adaptation, but others did not. These results lead to the conclusion > that the anecdotal reports of adaptation by divers can probably be > attributed to the subjective rather than the behavioral component of > narcosis. Dissociation of these components suggests mediation by different > brain mechanisms, and it is speculated that the gamma-aminobutyric acidA/ > benzodiazepine receptor complex, which has been implicated in both the > anesthetic and anxiolytic properties of agents such as nitrous oxide, > may be involved. (end) > > In other words, there is some degree of adaptation to nitrogen narcosis. > Divers think they're better after repeated exposures but that's about it. > > _________________________________________________________ > Do You Yahoo!? > Get your free @yahoo.com address at http://mail.yahoo.com > -- > Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. > Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'. -- Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'.
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