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Rod Nairne Wrote
>    The 1991 NOAA tests had some interesting results. Apparently,  a 
convulsion
>occured on mixed gas after 40mins at a po2 of 1.6.  For pure oxygen, the 
lowest
>po2 to produce a convultion was 1.76 ata.
>
>One explanation is that mixed gas has a higher breathing resistance due to 
the
>greater depths in which it is used. However, there is probably more to it 
than
>that, and generally speaking high po2's are less likely to produce symptoms 
if
>you are breathing pure 02.
>...

Chances are when you are breathing O2 you are hanging/resting and with your 
bottom mix you would be doing work.  O2 toxicity is directly related to your 
level of activity.

Safe Dive, Ed.

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