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> >does one "show susceptibility" to O2 hits?  i think not this hit is
> >not 'predicted' but it may only point out what a wild card O2 toxicity
> >is on a dive as ambitious as this should he not have been on full-face
> >mask for the O2 deco?  one would think that only prudent
> 
> I wouldn't be so hasty to say that there is no such thing as
> susceptibility to O2 hits.  Physiologically, high PPs of O2 use up
> certain enzymes and make the body more susceptible to an O2 hit so I
> don't see why someone couldn't be (for some reason) deficient in some
> of these enzymes.  (please, anyone more knowledgable than me in this
> area, feel free to fill in more details here, I'd really like to know
> more *or* to find out what I can *read* to learn more!).

I think the point (correct me if I'm wrong, william), is not so much to
question that one can *have* a susceptability to O2 hits, but rather that
such a susceptability would be detectable (i.e., "show susceptability"). 
The only way I would know if I was susceptable is if I have a largeish
sample of close-calls at O2 exposures that most people don't have
difficulty with.  I think most of us have never really had any "close
calls" from a symptomatic standpoint with O2 toxicity, since the
convulsions are often a one-way ticket to another world.  I suppose with
access to a chamber one could do a series of high O2 exposures and look at
the conditions under which hits occurred.  These tests would have to be
repeated many times, because the thing you'd be after is whether or not
you have a high frequency of days where you convulse with a given
O2-exertion exposure.  The within-individual variation appears to be
large, and it seems that nobody really knows what the relative scales of
within-individual variation and between-individual variation are.  It's
possible that some folks are, in general, less likely to be nailed; but
this has to be teased appart from the fact that we all have "good days"
and "bad days" in terms of susceptability.

Oh, hell, I can't remember what my point was...sorry about that!

Aloha,
Rich

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