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From: <kirvine@sa*.ne*>=20 > Let's run through a sample dive.... This thread has been, by far, the best information exchange on techdiver = I've seen in years. If anyone doesn't understand the significance of these = conversations they really need to take up golf. Thanks George, Jarrod, = Rich, Art, David, et. al. for the input. =09 > 4) the oxygen does not have to be hit too [hard]. I like 12-13 minute > stints with 6-8 minutes off. The reasons are that it takes almost no > time to saturate with oxygen at any ppo2 once the immediate offgassing > slows - a few minutes - and the damage starts to accrue after about > 16-20 minutes in our experience, depending of course on the dosages > already taken on the way up to this point. The swelling of the lung > tissue picks up after a few minutes, and the gas transfer process is > severely hampered. Vasoconstriction gets worse, and you are pissing in > the wind honking on the oxygen. You need to break to back gas, or in > this case , just move up and get out. This paragraph caused me to re-read a paper I had "Treatment of Migraine = Headaches with Hyperbaric Oxygen" (Youngblood, et. al.) This study assesed = the effectiveness of exposing migraine sufferers to a PPO2 of 1.5. The = study showed that 84% obtained at least partial relief with a mean time of = 14 minutes exposure. If the vasoconstriction caused by the high PPO2 is = indeed the cause of the relief then Georges statement, " I like 12-13 = minute stints with 6-8 minutes off." Hits the nail on the head as far as = optimizing gas exchange during the high PPO2 but resets(?) about the time = of vasoconstriction onset. George, do you (or anyone else) have any = information that supports the 6-8 min reset or does it just work? Chris Elmore College of Liberal Arts Univ. of SC (803) 777-1534 office (803) 348-3055 mobile Please use this address for all email: chris@sc*.ed* -- Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'.
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