Well, technically taken, and letting aside whether it is good or bad, even a single purge breath is hyperventilation. 10 purges sounds already like a pretty serious hyperventilation even if it is followed by a few normal breaths. Now I am not telling you should not do it when in safe environment secured by experienced safety divers, because I know many freedivers do and the hyperventilation prolongs their comfort phase. But I believe it may be dangerous getting used to it, because you will then replicate the same or similar breath-up even when diving in less secure conditions. And I am letting completely aside the fact already mentioned above, that the hypocapnia messes up your diving response and in the end-effect it leads to a quicker oxygen stock depletion.
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