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To: TechDiver@opal.com (Tech Diver)
Subject: Minimum allowable ppO2
From: chris@ot*.hs*.sc*.ed* (Chris Elmore)
Date: Sat, 24 Sep 1994 12:10:46 -0400 (EDT)

I just wanted to add some details and maybe a clarification regarding 
the ppO2 found at inhabited Andean altitudes. Non-aclimatized (that's
us) people start to exhibit hypoxic symptoms as low as 7,000 ft.
(ppO2= .16) and exhibit dramatic imparement by about 15,000 ft.
(ppO2= .12) although individuals vary quite a bit. On the other hand,
some Andean natives live above 15,000 ft and will work as high as
20,000-22,000 ft.(ppO2= .96-.98). This info comes from "Going Higher"
by Charles Houston MD and USAF manual "Physiological Training"
	The key here is aclimatized Vs non-aclimatized. High altitude
illness symptoms run the gamut from headaches to waking up dead. The 
Andean natives *may* have genetic differences allowing greater
tolerance for hypoxic conditions.

==============================================================================
Chris Elmore				 University of South Carolina
chris@ot*.hs*.sc*.ed*	   Humanities and Social Sciences Laboratory
(803)-777-7840 		  		     Columbia, S.C. 29208

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