With thanks to @JackPedigo for originally posting the links.
"Evidence began to accrue that long-COVID patients were breathing shallowly through their mouths and into their upper chest. By contrast, a proper breath happens in the nose and goes deep into the diaphragm; it stimulates the vagus nerve along the way, helping regulate heart rate and the nervous system. Many of us breathe through our mouths, slightly compromising our respiration, but in patients with post-acute COVID syndrome, lung inflammation or another trigger appeared to have profoundly affected the process. In these cases, patients’ breathing “is just completely off,” McCarthy told me." Meghan O'Rourke
[dysautonomiainternational.org];
Some years ago I paid for Stig Severinsen