Moderate hypercapnia leads to activation of the enzymatic reactions, which in its turn leads to producing a great amount of energy (ATP). As a result a cell is more capable of retrieving oxygen from the blood. As well as that regular trainings on “Samozdrav” improve the blood supply and nutrition of the brain, stimulate the development of the collaterals (bypass vessels). As a result this kind of influence “Samozdrav” prevents the main causes of the migraine.