On 2/10 Michel Therrien wrote:
>>You should consider taking five minutes air-breaks every 20 or 25
minutes.<<

I wonder why this is being suggested.  Most people would say "to back the CNS
clock down," but I am not sure this is valid.  Current thinking, as I understand
it, is that the %CNS clock "decays" or resets at a half life (or better,
half-time) of 90 minutes.  In other words, if you were at 100 %, after 90
minutes you would be at 50% and after 180 minutes you would be at 25 % and so
on.  If you are decoing at 20 feet on pure O2, and are at, for example, 100% of
your CNS clock, five minutes will bring you down to something like 97.25%
(somebody check my math).  Relatively speaking, a spit in the ocean.  Yeah it
helps a little, but roughly 1.5 minutes after you go back on pure O2 you are
back at 100%.  So what's the point?  

I think a lot of people are fooling themselves with this "air-break" thing.
Coments from the peanut gallery?

Safe Diving,
Jess

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