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Scott,

Thanks for popping your head in every now and then on these discussions,
no matter how much it seems you're talking to a brick wall.  :-)

I have one question for you (well, I have many, but I'll limit it to one
for now :-).

One thing that hasn't been brought up in this discussion so far is the
vasoconstriction caused by staying on high PO2 mixtures (regardless of
whether it's 80/20, 100%, etc).  I was under the impression that a large
reason for the breaks (and a large reason for the fact that they don't
have to be subtracted from the deco) is that the high PO2's cause
vasoconstriction, which in turns reduces efficacy of offgassing.  By
going off the high PO2 for a while you encourage vasodilation and thus
increase the efficiency of the offgassing.  

Is this correct?

Thanks,
Dave

Scott Hunsucker wrote:
> I will be very short for now, I have too much to do.  Once you come off of
> O2 your tissues/blood levels will still be higher than normal for some
> time.  You continue to reap benefits of decoing on O2 after you have come
> off of it.  Just because you stop and switch to a break gas, which
> subsequently should have the lowest O2 possible, and thereby have the
> highest He, for that depth.  This drops the PO2 and reduces the CNS load,
> both necessary steps.  Decompression is a function of time/depth/gas, not
> just one factor.  Since you are still offgassing N2 at an accelerated rate,
> from the O2, it is not necessary to stop the decompression timer until you
> go back on O2.  It all works together, gas, time, depth, physiology, to
> decompress correctly.  95% of people doing deco are doing more than
> necessary and thereby increasing the tissue/cellular damage that can come
> from it.  But, that is their choice and they do not have to follow anything
> unless they choose.
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