headache when force dynamic apnea.

[davizinhr]

When training in the swimmingpool yesterday I force the last apnea and then I got a headache, after that I leave the training. But today when I try to force a little the dynamic apnea, the headache came again

any Idea?, I have read that this could be because of hypoxia, alpinists suffer this when they are over 2500mts.

any solution to avoid it (and I mean not to leave before hypoxia :-D), today I was with only one diafragmatic contraction.

thanks in advance and sorry for my english

[azapa]

you could need to drink more water. dehydration in a pool is very easy. try those ISO drinks like gatorade if you don't like water (my problem). headaches are not too normal. It is more normal to start feeling a little hot (flushed) on a longer pool dynamic.

[salibandy]

If it make you feel better, I sometimes get headaches after an intensive session of underwater hockey. I too think it's the lack of oxygen.

I used to always feel flushed toward the end of my apnea, but nowadays its all gone.

[sanso]

Originally Posted by davizinhr

... avoid it (and I mean not to leave before hypoxia :-D),...

Uh, I think the point with freedive training is to dive without reaching a state of hypoxia. If You suffer from hypoxia, You've overdone it and should adjust Your training.
Did Your buddy notice that You had very blue lips that day?

[trux]

Actually, the headache at freediving is usually caused by CO2 excess, not really by hypoxia. CO2 in high levels is toxic, and headache is one of the symptoms of it. That told, it does not mean you are reaching any CO2 levels dangerous to your life or health. You will probably get used to it sooner or later, to certain degree. You can also try making longer recoveries between breath-holds - ventilate well after the performance to evacuate CO2 and other waste products, but avoid hyperventilating before the next one! Good but not excessive hydratation as pointed out above by others, is important of course too.