by training the diaphragm and ribcage flexibility they often manage to have the maximal capacity otherwise unseen and persons of similar body physiology.
I use a lung trainer cautiously, but daily. any studies on Lung trainers effects on the lungs?
It may be true that at untrained person, brain can start being hypoxic within a few minutes, but the reason we train static apnea is to learn the organism switching to a saving mode quickly and hence prolonging so the time until you get hypoxic. One important part of this mechanism is called mammalian diving reflex and it involves vasoconstriction, blood-shift, change of heart-rate and metabolism, mobilization of hemoglobin cells, and other effects. Top freedivers are usually able to trigger quite strong diving reflex and quite early after starting the breath-hold.
I let cool water into my suit in the beginning of my dives for this reason. the water here is 29C and 100ft vis all year except after rain storm events for 7 days. By then the current takes all the turbidity out to sea.
this section on vasoconstriction/mamalian refelx, and packing was all nicely covered in the copy of Freediving by David Sipperly and Terry Maas, Physiology I, Page 25-38. I refer to it repeatedly. hence my newbie decision to unhastily limit my submarine moments either killing fish to eat them, or photographing them, to not much more than a minute till I get a cressi EDY computer to more accurately gage time, and track my diving habits. I am sure you will want to RAIL me over diving without a Computer, but I assure you it can be done safely keeping in mind Ama divers have done this for many years, so did all of the early pioneers of Freediving, such as Wally Potts, Prodanovich, and many others unknown to the modern world. their knowledge had to be preserved orally rather than textually such as this forum, which I am greatful for.
perhaps my question got mired in a miss understanding of approximate Hypoxic state and the variability among individuals, for supressing hypoxia, my appologies.
As for my question, personally, I was curious, about the opinions of many in the apnea medical community. I expected some of the response to be clynical, and perhaps a bit Curt in lieu of my lacking terminology, and complete understanding of hypoxia; plese excuse me, I dont even come close to that state spearfishing, and I qualified my question as a non competitive diver.
what I did expect was some professional curtesy in answering what is perhaps, not just mine, but a common misconception regarding hypoxia outside of competition. I am sure each time someone blacks out, there are twelve compeditors formulating theories on what led up to the Hypoxia, and even then, maby one of them is close to determining what really caused it.
They further increase the volume of air by so-called packing, when they pressure the air inside lungs by "gulping" some additional mouth-fills of air.
I have a buddy I hunt with who does this for 2min bottom times at 25M while waiting for fish. (3 min total time) dont get me wrong, it is nice, but I think it is a bit risky. he has been spearing since he was 9, I have only started 7 months ago (big admition about my initial questoin, and my perception), but I follow as a humble student and respect what he tells me. I hold my own close to 20M for less than a minute, and dont push longer without a timer and some more experience. I have easily blown a comfortable TLC of 6000CC on a spirometer. So that makes me normal for a healthy adult, nothing special, but it can be improved slightly with some practice, and exercise.
thanks, for the reply, your answer was revealing on many levels about compeditive freedivers from Europe.
I hope you can manage to relax when you compete next or it will disrupt your MAX, and if you are a practising PHD then I am sure you know how important relaxation is to freediving and surgery, as well as responding to posts.
TBGSUB.
"I get it now, Black out first, then brain damage occurs; so as long as I dont black out, I can explain vasoconstriction, and mammalian reflex to newbies without flipping though my little book again."