co2 poisoning

[pingshui]

I was wondering how big the danger of co2 poisoning is in freediving. I know for those, who breath pure oxygen before static, it can become very dangerous. But in a normal freediving session, with repeated diving for 3-4 hours or long co2 tables, how big are the chances for co2 poisoning?
When I play uwr for a long time or go diving for 3-4 hours, I get a strong headache. Could this be related to co2 and a first stage of co2 poisoning? How dangerous could this be for me, especially in the long term?

I would really be happy, if you could answer some of my questions.

 

[Rik]

Is it possible to experience any effects of carbondioxide when doing prolonged A tables?

Yes... absolutely. And you can experience narcosis. With that narcosis, you can do stupid things that might harm you. I am not sure if an A table could cause potential fatal cardiac arrhythmia's when you are still conscious.

I am not familiar with long-therm effects of the A table besides improving your results, nevertheless, it would make a nice study subject. Especially regarding the relationship between A table training and the breathing response to exercise.

 

[pingshui]

Thnaks for this answer. So I assume that my headache may come from c02 poisoning and just hope that it will not have long term effects :duh

 

[trux]

Yes, the headache definitely comes from the excess CO2, though I would not necessarily call it poisoning, but rather a physiological reaction, possibly related with the strongly vasodilatative effect of CO2 on the brain blood vessels. Eric Fattah recommends jalandhara bandha to suppress the headache. Read his posts for example here: http://forums.deeperblue.com/freedi...ues/53900-static-no-warm-up-5.html#post509976

 

[pingshui]

Thanks for the suggestion, I will try that for the tables. But during uwr and lake-diving this might be hard to do.But maybe it works as therapy afterwards as well.

 

[trux]

Yes, do it afterwards, not during the dive

 

[Simos]

Thanks for the suggestion, I will try that for the tables. But during uwr and lake-diving this might be hard to do.But maybe it works as therapy afterwards as well.

I don't see how it would work as therapy afterwards but then again I don't think I fully understand the mechanism involved. I wonder whether some aggressive hypeventilation after diving could work as therapy though - anyone got any thoughts/experience?

 

[trux]

I don't see how it would work as therapy afterwards but then again I don't think I fully understand the mechanism involved. I wonder whether some aggressive hypeventilation after diving could work as therapy though - anyone got any thoughts/experience?

The physilogical effects of jalandhara bandha are explained in the Physiological Handbook for Teachers of Yogasana:

Approximately 90% of headaches are of the "tension" variety, and involve a superpressurzation of the arteries of the brain due to vasodilation of the arterial walls (Subsectio 3.B. Headaches, page 37). In many cases the vasodilation can be released ...

Well, I can't copy and paste from the document (it is an image), and am lazy to type it all, but the chapter is rather long, so have a look at it. It is not only the mechanical position, the sana stimulates also several centers below the chin, activates the parasympathetic system, helps venous drainage though the neck, and regulates the vasodilation (caused by the high CO2)

 

[Simos]

The physilogical effects of jalandhara bandha are explained in the Physiological Handbook for Teachers of Yogasana:

Well, I can't copy and paste from the document (it is an image), and am lazy to type it all, but the chapter is rather long, so have a look at it. It is not only the mechanical position, the sana stimulates also several centers below the chin, activates the parasympathetic system, helps venous drainage though the neck, and regulates the vasodilation (caused by the high CO2)

Very interesting, thanks Trux - do you reckon hyperventilation could achieve the same effects (or rather reverse the effects)

 

[trux]

Probably not the very same effect, but should help too