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Idea: Pressurizing lungs on ascent.

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Sorandril

Member
Jun 13, 2020
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Kind of like a hook breath. Anyone think this technique might reduce blackout risk?
 

Sorandril

Member
Jun 13, 2020
111
16
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The AMA apparently do some kind of whistle/hook breath on exhaling for this purpose.
 

Nathan Vinski

Well-Known Member
Apr 19, 2015
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The AMA apparently do some kind of whistle/hook breath on exhaling for this purpose.
In my experience, hooking only has a positive effect if you are on or just over the edge of LMC.

I would assume that an underwater hook would also only be beneficial if you are passed the hypoxic edge and starting to BO.

Now.. if you are started by to BO while still underwater it's probably too late for anything to save you. Maybe the underwater hook could keep you conscious for a second or so more but as pO2 drops from ascending and you relaxes the hook to take your first breath you'll blackout anyway..

Probably takes more energy than its worth.
 

Sorandril

Member
Jun 13, 2020
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So it’s twofold, the whistle... makes the other ama look at them to make sure they’re alright as well.... some article on them said it was a safety measure of theirs....
 

Nathan Vinski

Well-Known Member
Apr 19, 2015
279
179
83
25
So it’s twofold, the whistle... makes the other ama look at them to make sure they’re alright as well.... some article on them said it was a safety measure of theirs....
I thought you were talking about hooking while still underwater.. same kind of technique as bracing before a heavy squat or deadlift..

Hook BREATHING at the surface after a dive is basically a universal technique taught to nearly every beginner in every course..
 
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