Physiology of long pranayamic breathing: neural respiratory elements may provide a mechanism that explains how slow deep breathing shifts the autonomic nervous system.
Jerath R, Edry JW, Barnes VA, Jerath V.
Med Hypotheses. 2006;67(3):566-71. doi: 10.1016/j.mehy.2006.02.042. Epub 2006 Apr 18.
Effects of A Brief Resonance Frequency Breathing Exercise on Heart Rate Variability and Inhibitory Control in the Context of Generalised Anxiety Disorder.
Spalding DM, Ejoor T, Zhao X, Bomarsi D, Ciliberti M, Ottaviani C, Valášek M, Hirsch C, Critchley HD, Meeten F.