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Do you mean, what do you do about the CNS clock? The basic answer is "air" breaks, which on 250' dive is actually back-gas breaks. 5 mins every 20-30 minutes, and, this may be a little provocative, but there is no need to penalize (increase) your decompression time, and current thinking is they may actually improve deco. Doing this allows you to "Safely" exceed the CNS clock to a few hundred percent. I've heard that on some of the longer dives, the WKPP guys may be spending upwards of 50% of the time on air breaks towards the end of the oxygen exposure. One little side note, in that one big oxygen study (in _oxygen and the diver_??) almost all of the episodes were after coming OFF o2. Interesting stuff. At 09:59 PM 9/9/1999 -0400, dmackay@cg*.wa*.ca* wrote: >Hi George and to anyone who might have an answer, > >On my longer dive profiles which are typically 30 - 50 minutes @ 250', I >always >use a 16/50 mix with 50% & 100% for deco. At the end of these dives (or longer >duration) I have blown my CNS clock away. For a 50 minute exposure I have >a total >CNS clock of ~180%. This does not appear to cause me a problem as I have been >doing a couple of dives a week using profiles like this for a couple of >years now >and this has not proved a problem. The only time I think that I ran into >this as >a problem was about 4 years ago when I was diving a lot of deep air with >36 and >80 for deco (ok it was before I saw the light) on the last two dives I did >in a >two week period I couldn't breath by the time I hit my 20' stop. Symptoms >didn't >abate till I was on the surface for about 15 min. In anycase I don't do >that now. >I know this is small potatoes compared to what you and JJ do on a normal WKPP >dive. What do you do just ignore it? or what is your philosophy on this? > >Thanks, >Dan ---------------------------------- Kevin Connell <kevin@nw*.co*> NW Labor Systems, Inc http://www.nwls.com Who is John Galt? ---------------------------------- -- Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'.
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