Circular breathing is easiest to accomplish on the didgeridoo. This is because of several reasons: optimal back-pressure (hits the sweet spot between lack of resistance on a flute and too much of it on an oboe, for example), loose embouchure (relaxed lips make it easier to puff up the cheeks) and single drone focus (no distracting fingerings required).
I also suspect the intense vibrations have a similar effect (probably stronger) to humming, which is known to dramatically (15-20x) increase the release of beneficial nitrous oxide in the nasal passages.
> I also suspect the intense vibrations have a similar effect…
My gut says that there are some interesting discoveries waiting around the intersections of frequency of vibration, individual resonant frequency, and duration
Possibly yes when it comes to air pressure, but the learning curve will be steeper. But not when it comes to the generated vibrations, and my bet is the latter are more important.
the study was conducted using a didgeridoo but the circular breathing seems to be the important mechanism. No studies have been conducted on other instruments that require or benefit from it.
I doubt many of them actually figured out how to circular breathe after one lesson. Source: have been playing sax for 20 years, tried learning it many times, still no good.
I also suspect the intense vibrations have a similar effect (probably stronger) to humming, which is known to dramatically (15-20x) increase the release of beneficial nitrous oxide in the nasal passages.