Quote:
Originally Posted by amihov
I in my case it is different. I am not trying to avoid hyperventilation but just to control it. I have a sweet spot when my head starts to spin that means that i have just past that point. So in this case i wait 10 to 20 sec just so i get back on track and then i am ready for dive. I have notice that if i have past the sweet point i have problems whit swimming it feels like i am out of energy and i feel sleepy during the dive. The best thing is just to experiment in the pool when you have someone watching you.
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That's a relatively safe way to heaven's (or hell's) gates. Hyperventilation is the most favorite trick of beginners with no experience and with no theoretical background, because it's an easy way how to prolong the comfort part of the dive. It really works fine. Even way too much fine. So well that one day you may never come back up to the surface.
The problem with it is that hyperventilation in no way delays the hypoxia. In contrary: by hyperventilating you set the brain into an immediate hypoxia because the carotid arteries supltying the brain react on the low level of CO2 by a strong vasoconstriction, while letting the periphery blood vessels fully dilated, hence consuming the precious oxygen you'll need in a while.
And while during a normal breath-hold (without any hyperventilation), the increasing CO2 level triggers strong oxygen-saving diving response, after the hyperventilation, the body takes much longer time before it gets into that state (if it gets there at all).
So although after hyperventilation the breath-hold definitely feels easier, you are getting hypoxic much faster, and especially you get no warning signs about it. You may be lucky to survive dozens or even hundreds of such dives, but you are pre-programed to die soon if go on with this method. You better learn diving without hyperventilation and endure the discomfort - your performance will boost, while still keeping better security margin.
