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At 06:07 AM 9/10/2002 -0400, Capt JT wrote: >>In other words, just because you sat for 40 minutes at 3.0 >>without toxing today doesn't mean you can do it for 5 minutes >>tomorrow and not tox. >Without going into great detail, that's what I said, but then again only a >moron or someone being the subject of a test or in a controlled environment >would be doing 3.0 Hello JT, That's not what you said. Here's what you said: "Oxygen poisoning is determined by interactions between the oxygen dose and the relative susceptibilities of the exposed tissue." I'm not sure what you mean by "relative susceptibilities of the exposed tissue" but it seems like you're suggesting that different people (tissues?) have differing fixed susceptibilities to O2 tox. This has been clearly shown not to be the case. There is no such thing as a fixed susceptibility to O2 tox. All available evidence suggests that whether or not you tox at a given PO2 on any given exposure is random with the probability increasing with PO2. There is no such thing as a diver who is better able to tolerate elevated PO2 than another diver. "You must take into account PO2 and duration of the exposure. Each person can have different levels of exposure they can handle..." Again, you appear to be suggesting that some divers can handle a higher PO2 than other divers. This statement isn't supported by the evidence; quite the opposite, actually. "and some will say they have the correct answers on this subject, but the only answer they have is for themselves or the test subject when pushing the limits." You're again suggesting that some people have some magic PO2 beyond which they will tox. This is not so. I have dozens of studies on this, and they all agree. Some divers have toxed after a few minutes at 1.4 and others have sat around for 150 minutes at 3.0 without a problem. There is, so far, no way to predict tox. I feel compelled to jump in on this thread because I'm concerned that, whether intentionally or not, you're giving people the idea that if they've been diving high PO2 for a long time they are somehow more "immune" to O2 than others. It's important for people to understand that this is not so. All of us, those with 1000 dives and those with 10, are rolling dice each time we dive a PO2 approaching 1.6 even if we've done it and survived before; and the only way to reduce the risk is to reduce the PO2, more so for extreme dives. -Mike Rodriguez <mikey@mi*.ne*> http://www.mikey.net/scuba Pn(x) = (1/(2^n)n!)[d/dx]^n(x^2 - 1)^n -- Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'.
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