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Scott Hunsucker wrote:

>     Reread the statement he made a little more carefully.  He said it "is
> offset enough to open up the vessels"  This should not be enough to
> completely "reverse" (return to complete normalcy) the constriction per se,

Ah, there's one of the problems.  When I said "reverse", I meant reverse
the trend, not return to complete normalcy.

>  I am sure there is a mild
> constricting effect at normal diving PO2s, but this is sufficiently offset
> by the ability of the oxygen to continue to diffuse in spite of the
> constriction, and should also be relieved (not reveresed) by breaks.

OK, so let me reiterate to see that I understand correctly.  It sounds
to me that yes, even with non-WKPP-style dives, that the breaks will
provide some relief to the constriction but that due to the O2's ability
to continue to diffuse it's not likely to be a big factor.  When you get
closer to the WKPP-style exposures, the difference becomes greater.

So I also take it from this that this phenomenon is not the primary
means by which offgassing efficiency is increased during gas breaks.  So
I assume that the other two reasons that Trey listed:  1) Lungs not
adding layers 2) Prevention/halt/reversal of asthma-like reaction, are
the primary reasons the offgassing improves.

If that's the case, could you elaborate on these reactions?  

>     Did this provide some clarification?

As always, yes.  Thank you!

-Dave
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