With the popularity of the Wim Hof method and other breathing approaches, one has to remember Wilhelm Reich was working with breathing and hyperventilation in the context of psychotherapy many years ago. Long before Reich, shamans and other practitioners reached states of trance and ecstasy through hyperventilation, so this is nothing new. This article is the only one that I have found which debunks some of the "iffy" science around breathing and hyperventilation and at the same time examines its possible therapeutic benefits with regard to emotional expression and release.
https://reichandlowentherapy.org/Cā¦/Practices/breathing.html
Author: Michael Samsel