Randomised clinical non-inferiority trial of breathing-based meditation and cognitive processing therapy for symptoms of post-traumatic stress disorder in military veterans.

The short version

This parallel-group, randomised non-inferiority trial with 85 military veterans explored whether Sudarshan Kriya Yoga (SKY) -- a structured program of breathing exercises (pranayama) and meditation -- works as well as cognitive processing therapy (CPT), a standard trauma-focused psychotherapy, for reducing post-traumatic stress disorder (PTSD) symptoms. PTSD is a condition that can develop after a traumatic event, involving re-experiencing, avoidance, and heightened arousal. A non-inferiority design tests whether a new approach is not meaningfully worse than an established one, rather than whether it is better, which is appropriate when the existing treatment is already known to be effective. Veterans (88% men, average age 57) with elevated PTSD symptom scores were randomly assigned to SKY (n=41) or CPT (n=44) at a Veterans Affairs outpatient clinic. SKY was taught in small groups over a five-day intensive workshop plus ten weekly sessions (25 hours total), combining five distinct breathing techniques with meditation. CPT consisted of twelve individual sessions over six weeks (12 hours), focused on shifting trauma-related thinking patterns. Symptom severity was measured with the PTSD Checklist-Civilian Version (PCL-C), alongside depression (Beck Depression Inventory-II) and mood (Positive and Negative Affect Schedule). Both treatments reduced PTSD symptoms by the end of six weeks (CPT: -6.8 points, effect size d=0.58; SKY: -5.6 points, d=0.41), and the small gap between them (-1.2 points, 95% CI -5.7 to 3.3) fell safely within the study's 10-point margin for calling SKY "not meaningfully worse" -- a pattern that held at 1 month and 1 year. SKY also matched CPT on depression and mood scores through the 1-month mark, though CPT pulled ahead on both by 1 year. Dropout was similar overall (SKY 27% vs CPT 34%), and among veterans who attended at least one session, fewer left SKY (9%) than CPT (29%). Two adverse events occurred in the CPT group (treatment-related distress; a hospital admission for suicidal ideation); none were reported in the SKY group. The authors describe these results as preliminary support for SKY as a non-trauma-focused option for veterans with PTSD symptoms, comparable in the short term to an established first-line therapy. They note SKY involved roughly twice the contact time of CPT, the trial ran at a single site with a moderate sample of 85 participants, and CPT's own effect size was smaller here than in some earlier veteran studies. The authors state that SKY warrants further clinical and research attention.

Key findings

• In this 85-veteran randomised trial, a structured breathing and meditation program called Sudarshan Kriya Yoga (SKY) reduced PTSD symptom scores about as much as cognitive processing therapy (CPT), a standard trauma-focused talk therapy, immediately after six weeks of treatment and at one-month and one-year follow-ups.
• SKY involved a five-day workshop plus ten weekly group sessions (25 hours total), teaching five different breathing techniques, while CPT involved twelve individual sessions (12 hours) focused on changing trauma-related thoughts.
• SKY matched CPT's benefits for depression and mood through one month, but CPT showed larger improvements in these areas by the one-year mark.
• Dropout rates were similar overall between the two treatments, and fewer veterans who attended at least one SKY session left the study early compared with those who attended at least one CPT session.
• Two participants in the CPT group experienced adverse events during the study (treatment-related distress and a hospitalization for suicidal thoughts), while no adverse events were reported among SKY participants.

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