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To: techdiver@opal.com
Subject: Re: bent sooner or later
From: shelps@ac*.ma*.ad*.ed*.au* (Prime Rat)
Date: Mon, 18 Apr 1994 12:11:17 +0930
>In my opinion getting bent is not inevitable and is extremely
>embarrassing. Too many diver I meet seem to think there is something
>machismo is screwing up and getting bent

Well, I think you are wrong.  Decompression tables are subject to a failure 
rate (Homer et al 1985).  A lot of time and effort is invested in making 
decompression schedules as safe as possible however, enough testing always 
shows a failure rate.  That is because these tables are simple mathematical 
models with some empirical fine tuning to try to reduce the bend rate to an 
acceptable level for the target audience (viz; a bend rate of 5% is OK for 
the Navy, they mostly have recompression facilities shipboard whereas I 
personally would use a table with a lower bend rate than that).  
Decompression illness is a complex process which is only inititiated by 
bubbles.  Every dive involves some venous bubble formation (Eckenhoff et al 
1990) therefore every dive has a liklihood of DCI.  Dive often enough and 
you are going to get bent.  Not your fault, just that the models used to 
create decompression schedules are simplistic.

Homer LD, Weathersby PK (1985) Statistical aspects of the design and testing 
of decompression tables.  Undersea Biomedical Research 12:239-249
Eckenhoff RG, Olstad CS, Carrod G (1990) Human dose-response relationship 
for decompression and endogenous bubble formation.  Journal of Applied 
Physiology 69:914-918

/Rat


~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
shelps@ac*.ma*.ad*.ed*.au*

Bring in the bottled lightning, a clean tumbler, and a corkscrew. 
	DICKENS, CHARLES 1812-1870
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