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Date: Sat, 15 Jun 1996 16:14:06 -0700 (PDT)
From: "Peter N.R. Heseltine" <heseltin@hs*.us*.ed*>
To: HeyyDude@ao*.co*
cc: David Doolette <ddoolett@me*.ad*.ed*.au*>,
caccioly@co*.ri*.co*.br*, deepreef@bi*.bi*.ha*.or*,
techdiver@terra.net
Subject: CNS Clock Values

HeyyDude,

For just a moment there, I thought you were going to riff on O2 toxicity..

but...seriously folks, what evidence is there that the CNS clock "resets"
rapidly at the surface as you indicate? I know the *theory* is that you
consume O2 and are offgassed rapidly - but what if the effect is
one of O2 on membrane stability? (Which seems more plausible). I don't
know how you would measure that effect on cumulative dives, except
empirically. Also the O2 clock assumes an equal increase of risk for each
minute passed at a given pPO2 - risk analysis curves rarely look like that
and the Navy model for CNS O2 toxicity (ref in the lists - it's Underwater
Scuba Magazine - April issue) has a curve not a line. So??

Peter Heseltine

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