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We break to the most hypoxic mix we can breathe all the way up at least
every twenty minutes, and in the oxygen phase we shorten that to as low
as 12 minutes with up to 8 minutes off. We do not interrupt the shcedule
for these "breaks". This routine spares the oxygen damage completely, as
measured by vital capacity tests that day and the next few days. 

Take a look back at what the usdct idiots did - they fried all of their
divers repeatedly due to ignorance of how to properly do this.

The "clock" concept" is somewhat arbitrary and based on empirical
evidence - the breaks have extended the time to tox in tests. More
important, however, is the Navy experience which says that tox risks
comes in multiday exposures, so keep that in mind.

Dan MacKay 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

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