Mailing List Archive Mailing List Archive
At 10:39 AM 9/20/95, Richard Pyle wrote: >> > Rich and Jason - since it takes about two >> > minutes for the narcosis to develop, if you >> > decend faster, you will be two minutes past the >> > greater level of narcosis faster, thus shortening >> >> I've never heard this: where does this 2 minutes guideline come from? >> I've read a bunch on this topic but never seen this mentioned. > >I've also read a bunch and I've never seen it either. I can offer a reference from M&G's 'Mixed Gas Diving' pp. 113-115, "Causes of Narcosis'. The reference isn't footnoted so maybe it's not the hard facts that you'd like, but it does refer to the Meyer-Overton Hypothesis, which says that the 'effects are largely dependent on the concentration of the substance in the lipid factor of the responsible nervous tissue'. If the nitrogen uptake rate of the tissue was lower than the rate of increase in ppN2, (which we more or less believe to be true if we believe deco tables) it follows that the effects would lag behind the facts (so to speak). When you get there, your tissue continues to take on higher concentrations of N2 at their maximum rate of uptake, which might also explain the 'frog effect'. If you increase ppN2 at a rate slower than the tissue can take on gas, maybe it hits you a little softer. Scott.
Navigate by Author:
[Previous]
[Next]
[Author Search Index]
Navigate by Subject:
[Previous]
[Next]
[Subject Search Index]
[Send Reply] [Send Message with New Topic]
[Search Selection] [Mailing List Home] [Home]