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To: deepreef@bi*.bi*.ha*.or* (Richard Pyle)
Subject: Re: CO2 buildup/vaisoconstriction
From: story@be*.es*.sg*.co* (David Story)
Cc: JMAHON@UH*.UH*.HA*.ED*
Cc: techdiver@opal.com
Date: Thu, 5 May 1994 16:21:44 -0800 (PDT)

Richard Pyle writes:
> 
:
> Has anyone else noticed whether they find narcosis most severe at the
> beginning of the dive vs. at the end of the dive?  Any correlations to
> descent patterns?

It is often noted (and I've noticed it myself) that speed of descent
affects narcosis levels.  Because the only non-mechanically-assisted
way to speed down to depth is to kick down -- head first -- we may be
on to something here.  

The control would be to test chamber dives done with different descent
rates, where the subjects are neither head-down nor exercising. 

Anyone have any info?  My personal anecdotes are that exercise
(increased CO2) and rapid descents (head-down -- is that it?)
definitely increase narcosis for me.

Cheers,

David Story                        	        Silicon Graphics, Inc.
story@sg*.co*					Mountain View, California

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