Quote:
Originally Posted by SEDATE
i know a person like featon who can hold is breath 1 min dry but in water 3:30 easly  . he can not hold his breath very long on land |
That's what is considered normal. Normally you achieve better times in water than dry, because already the facial immersion triggers bradycardia, and if you are trained well or have good predisposition, also the remaining effects of the Diving Reflex (DR) kick in, hence you consume much less oxygen.
At people achieving longer times dry than wet, on the other hand, it may be because they do it after a longer resting period (i.e morning after waking up), or maybe they even involuntary "cheat" letting small amounts of air penetrating through their nose, or simply do not try hard enough in water, or have quite weak and bad DR. And of course, as I mentioned abve, if they use to hyperventilate, it may mess with the DR and suppress so the advantage of wet apnea.
However, at those times you named, which are probably nowhere near the physiological limit of the person, it is also quite likely that psychics and personal preferences plays a siginifcant role, that may be more important than the actual oxygen consumption or CO2 / O2 levels.
