I'd be interested in a device that can detect breathing type (diaphragmatic/costal) and warns me in time if any changes occur.
(with thirty years of practice in the Iyengar teachings, I consider myself a beginner-intermediate. I know enough not to go too far... When in doubt, let your natural breath return without interference (as said in the book))
I can't see any way this is possible. The amount you breathe out is dictated by how much your lung volume increased when you breathe in. If you breathe out for more total time than you breathe in, you are just spreading the same breath over a longer time by restricting outflow.
That you believed I suggested the laws of physics could be so easily dismissed is beyond me.
James Nestor, the author, has an amazing book on (not) breathing... actually about athletes who free-drive to unthinkable ocean depths with no gear.
It really is quite amazing the number of human limits free diving tests. Herbert Nitsch is able to dive over 350 feet deep essentially unaided, and has gone to over 830 feet in what they call a "no limits" attempt, in which weights and fins are allowed, and weight can be dropped to aid in the ascent, although he did suffer from nitrogen narcosis and needed to spend some time in a decompression chamber . He can hold his breath for over 9 minutes, whereas I can barely make it to 1 minute. The guy's lung capacity must be incredible.
> He still has balance and coordination problems on land, but does not experience these underwater. He continues to deep free-dive.
It's like the sea claimed him.
(Copy WSJ link, paste into bitly to shorten, then paste shortened url into outline.com)
"Discovered atomic bomb, didn't notice breathing."