Emma Seppälä recently published her findings about the impact of Yoga breathing on PTSD. In this interview she discusses these and reports that the benefits are long term and permanent and they seem to be better than conventional methods and other relaxing techniques. She theorizes that relaxation achieved due to these breathing techniques provides the space for the mind-body to receive and process the traumatic memories and hence provides a pathway to recovery and restoration.
Related: Warriors Find Peace Through Yoga