Several studies have demonstrated that adjuvant therapies as exercise and breathing training are effective in improving cardiac autonomic control (CAC) in patients with affective spectrum disorders. However, the effects of Sudarshan Kriya Yoga (SKY) on autonomic function in this population is unknown. To test the hypothesis that SKY training improves CAC, cardiorespiratory coupling and adaptive response of sympatho-vagal balance to orthostatic changes were evaluated in patients with anxiety and/or depression disorders.