Each time you practice you'll notice that apnea increases diuresis. But why? Let us explain why.
Put your body in terms of external pressure higher than atmospheric pressure triggers the reactions of adaptation including the gradual increase of blood in the pulmonary circulatory bed, which in turn causes a condition of "pulmonary hypertension".
Pulmonary hypertension is not tolerated by body that sets off a reaction to try to reverse this condition. The body during apnea is triggered to try to bring pressure to the optimum but it can not empty the lungs of blood that would otherwise collapse. Then involved other organs (kidney, heart) that secrete a hormone (peptide natridiuretico) that depletes the water of blood leading to the production of large amounts of urine.
This indirect route is activated in the kidneys of which is sequestered at a mineral in the blood is very rich: Sodium (Na +). Each sodium atom is sequestered by the kidneys that carries water to the necessity of maintaining a balance of dissolved salts. This will form a strange urine because it is a mixture of sodium and water very clear, clear and almost odorless.
The net effect is therefore to become dehydrated and go into the lack of Na +.
course this happens mostly under water, while in this area is negligible, but if we consider that often our outputs and spearfishing apnea lasting several hours, we realize the true extent of the phenomenon.
SO REMEMBER TO DRINK .... NOT WAIT TO HAVE thirsty
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