From Akoni "@Lungfish:
The nitrogen build-up in beginning freedivers is too little to cause problems.
Purging is not for beginners and in my opinion it's the same as hyperventilating which should be avoided anyways!
Deepwater black-outs are really rare and not stuff for beginners.
The vacuum effect as you call it (never heard of that term) is described in the shallow water black-out section."
FYI, I learned from Martin Stepanek and Performance Freediving. They currently teach the breath-up method including purging and packing. Clearly their opinion on the topic is different than yours. If you are familiar with hypocapnia and understand purging, it isn't dangerous at all. It is an effective way of managing gases, if done after saturating....
Secondly, many of the attendees in our class, myself included did their FIRST freedive below 25meters. Heck, a girl in our class who had never freedived before did 88ft on her first try. So the deepwater blackout isn't necessarily something to be avoided in the blackout discussion....
Finally, the Vacuum Effect is not my term, it is from the PFi manual. Shallow water blackouts happen for a variety of reasons and can be caused by several different types of gas imbalances as well as the Vacuum Effect. There is more than one cause of shallow water black out.
The nitrogen build-up in beginning freedivers is too little to cause problems.
Purging is not for beginners and in my opinion it's the same as hyperventilating which should be avoided anyways!
Deepwater black-outs are really rare and not stuff for beginners.
The vacuum effect as you call it (never heard of that term) is described in the shallow water black-out section."
FYI, I learned from Martin Stepanek and Performance Freediving. They currently teach the breath-up method including purging and packing. Clearly their opinion on the topic is different than yours. If you are familiar with hypocapnia and understand purging, it isn't dangerous at all. It is an effective way of managing gases, if done after saturating....
Secondly, many of the attendees in our class, myself included did their FIRST freedive below 25meters. Heck, a girl in our class who had never freedived before did 88ft on her first try. So the deepwater blackout isn't necessarily something to be avoided in the blackout discussion....
Finally, the Vacuum Effect is not my term, it is from the PFi manual. Shallow water blackouts happen for a variety of reasons and can be caused by several different types of gas imbalances as well as the Vacuum Effect. There is more than one cause of shallow water black out.