Yoga-Based Group Intervention for Inpatients with Schizophrenia Spectrum Disorders-Feasibility, Acceptability, and Preliminary Outcomes of a Rater-Blinded Randomized Controlled Trial.

Background and hypothesis: The efficacy of yoga as an adjunctive treatment for schizophrenia spectrum disorders (SSD) has garnered interest. While yoga may positively influence various symptom domains, further investigation is needed due to the limited number, quality, and generalizability of studies. This study assessed the feasibility and acceptability (primary outcome) of a yoga-based group intervention (YoGI) developed in a participatory approach and explored its preliminary effectiveness.

Study design: In addition to the primary outcomes, this preregistered randomized controlled trial examined rater-blinded general psychopathology, positive- and negative symptoms, and self-rated depression, anxiety, stress, body mindfulness, mindfulness, psychological flexibility, cognition, social functioning, quality of life, and medication regime at baseline and postintervention as secondary outcomes.

Study results: Fifty inpatients with SSD received either TAU (n = 25) or YoGI + TAU (n = 25) for four weeks. Outcomes showed 95% protocol adherence of YoGI, feasibility, and retention rates of 91% and 94%, respectively, and a dropout rate of 6%. ANCOVA revealed significant between-group postintervention improvements for YoGI + TAU in positive symptoms, depression, cognitive fusion, and a mindfulness subscale. Medium-to-large pre- to postintervention effects were found for body mindfulness, positive, negative, and general psychopathology, cognitive fusion, depression, anxiety, stress, quality of life, and attention in YoGI + TAU, while within-group changes were consistently smaller in TAU. No severe adverse events were reported.

Conclusions: This trial supports the feasibility and acceptability of YoGI for inpatients with SSD and provides preliminary evidence of YoGI's benefits beyond TAU. Further robust, multicentric RCTs are warranted to deepen our understanding of YoGI's therapeutic potential and inform clinical interventions for SSD.