It also hits your HRV. My Garmin watch (Fenix 5X) has a deep breathing timer (relax timer). It will definitely increase my HRV when I do it (lowering the watches real time stress score, which is measuring HRV). So it is physiological and psychological.
https://www.google.com/amp/s/www.psychologytoday.com/us/blog...
It also hits your HRV. My Garmin watch (Fenix 5X) has a deep breathing timer (relax timer). It will definitely increase my HRV when I do it (lowering the watches real time stress score, which is measuring HRV). So it is physiological and psychological.