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> 	The absolute production of CO2 is metabolism related - since
> this is not depth related, the amount of CO2 remains the smae regards of
> depth (since you are breathing out, the ppCO2 in you lungs at 40m, 80m
> or 0m is the same).

This line of reasoning has always seemed correct and logincal to
me but it is not my experience.  At depths of 100' and deeper,
I feel that I am in total control of my breathing.  I can slow
down my breathing to rates at which I get headaches from high
levels of CO2 in my blood, perhaps 1 - 1 1/2 breaths per min.
My understanding is that these headaches are caused by dialation 
of blood vessels in the head from high ppCO2 in the blood. 
(Am I wrong?)  These headaches  disappear soon after increasing 
my breathing rate.  This slow breathing is done without any 
feelings of discomfort and feels natural and relaxing.  It does 
require some level of awareness of my breathing but this is
always true when I dive.   Is this unusual?


Philp Weissman

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