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On Mon, 17 Jun 1996, TOM MOUNT wrote: > On the CNS clock, each time you take an air break it does some degree of > resetting the CNS clock (also the pulmonary clock) The exact amount is not > known but it is from experience both from diives and from chamber work an > extensive amount. I just wanted to clarify that I DO believe in the value of short low-PO2 breaks after long exposures to high PO2. I don't know if it actually helps, but I do know that chamber operators have consistently seen the advantages of the breaks. However, I don't think it's fair to directly compare experiences of chamber operators to the diving we do, as chambers generally run PO2's of close to 3 atm. As I said, the CNS% clock value does seem to come into play, but only at PO2's that none of us should be breathing. The PO2:probability to convulsion curve is not linear. The most recent evidence I know of is that at PO2's on the order of 1.4, convulsions are random (=unpredictable; not correlated to any sort of "clock"). I do the low PO2 breaks, but not because I belive in the CNS% clock at PO2 values of 1.4 atm or less. Aloha, Rich Richard Pyle deepreef@bi*.bi*.ha*.or* ******************************************************************* "WHATEVER happens to you when you willingly go underwater is COMPLETELY and ENTIRELY your own responsibility! If you cannot accept this responsibility, stay out of the water!" *******************************************************************
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