I concur with Eric's opinion.Every ventilation other than normal breathing IS hypervetilation.I've felt this myself many times when trying to breath deep and very slow but eventualy i start to feel "needles nad pins" in my extremities(obvious sign of hyperventilation).Now i just breath normaly(like when i'm sleeping).Only when breathing like that I know that i start the dive with normal level of co2.Since i started breathing like this i haven't had an LMC or a blackout and regularly feel burning in my legs and hands at the end of the dive as a sign of the diving reflex kicking in.
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Alex
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