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Not a QP but I don’t think you will gain much if anything from this device. A healthy person not suffering from a breathing disorder has roughly twice the lung capacity to handle the gas exchange needed for an endurance type event(ironman, marathon ect.). The limiting factor in the system is gas exchange; getting oxygen in and carbon dioxide out. It’s a matter of cardiac out put rather than lung capacity.
When you are redlined and your lungs feel like you cant get enough air, its not because of lung capacity. It is because you cant exchange the carbon dioxide for the oxygen in your lungs fast enough.
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