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Old 03-28-2009, 08:24 AM   #35
jfjf
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Join Date: Oct 2003
Location: Palm Bch County
Posts: 11,256
Re: Three more blackouts!

Quote:
Originally Posted by Mullins View Post
Ray, breathing deeply to remove CO2 is exactly what causes divers to black out. Unfortunately, there is no way of 'safely' removing CO2. The more you remove, the more comfortable you will be and the earlier you will black out, which is a bad combination. The 4-5 breaths you're advocating WILL in fact reduce time to blackout. .
I don't understand this comment. Maybe I'm taking it out of context or you didn't choose your words carefully? Why would hyperventilation reduce "time to black out"? I thought hyperventilation would allow someone to more easily attain a breathhold duration that would cause a BO, but the effect would be that they would feel more comfortable due to the reduced CO2 levels for most, or all, of the breath hold?

I always thought that hyperventilation would not have a significant effect on maximum breathhold (that is, as long as you were willing to really suffer).
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