The phenomenon of respiratory sinus arrhythmia is well known. But, I don't know (I am an engineer) the exact receptors, feedback mechanisms, cerebral control centres, etc. involved in this process. Also, experiments have shown that varieties of controlled deep breathing (pranayama) bring down the blood pressure (I have experienced this personally also, having become free of my hypertensive medications for the past 3 years, after having been dependent on them earlier for over 9 years. I want to understand the complete physiological mechanism. I shall be grateful to anyone, who can point me to relevant books, journal papers, review papers, etc.

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