Making an effort to be more intentional in breathing more slowly (5 to 8 breaths a minute) and deeply can be very helpful. Pursed lip breathing is a final technique that allows individuals to slow down their exhalation. This too can have very beneficial effects on the way your body uses oxygen and consequently can enhance cues for safety and relaxation.
Source: www.tmj4.com/brand-spotlight/windrose-recovery/what-story-is-your-body-telling-you