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Wilson Angerson wrote:
This 2 minute delay you're talking about is (I assume) the nominal 
time it takes for critical tissues (i.e. brain) to get reasonably close
to 
equilibrium with the breathing gas (it ties in with an accepted value 
for human cerebral blood flow of about 50 ml/100g/min). That's 
different from the time delay for the equilibrium *target*> 


  -   Wilson, I am the one who said that - it is from my experience
swtiching back and forth - 2 minutes. This is why the deep air guys
sometimes get away with a 450-500 footer, and sometimes they get delayed
and black out, and why they feel like they are blacking out as they
cross the 250 foot area on the way back up, and why on any ascent you
get that sensation in your eyes. - G
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