Psychiatry · Medical Literature
Randomized Controlled Trial on the Effect of Yoga on Anxiety Severity, Quality of Life, and Biomarkers in Individuals with Anxiety Disorder.
Abstract
Anxiety disorders are highly prevalent mental health conditions characterized by physiological dysregulation that includes heightened stress responses, low-grade systemic inflammation, and metabolic imbalance, which together contribute to impaired quality of life. Although yoga-based interventions are increasingly used as complementary therapies, evidence isolating the effects of slow pranayama (yoga breathing) and savasana (corpse pose) on psychological outcomes and biochemical markers in anxiety disorders remains limited. This randomized controlled study evaluated the effects of slow pranayama and savasana, implemented as adjuncts to routine psychiatric care, on anxiety severity, quality of life, and selected biochemical markers in individuals with anxiety disorders. A total of 150 people diagnosed with anxiety disorders were allocated to either routine psychiatric care alone (control group) or routine care plus slow pranayama and savasana (intervention group) for 8 weeks. We assessed anxiety severity using the Hamilton Anxiety Rating Scale, quality of life using the World Health Organization Quality of Life-Brief questionnaire, and biochemical markers such as serum cortisol, brain-derived neurotrophic factor (BDNF), inflammatory markers, and metabolic parameters. Outcomes were analyzed using mixed-design analysis of covariance with Bonferroni correction, and correlational analyses were performed between psychometric, quality-of-life, and biochemical variables. Of the enrolled participants, 112 completed the study. Significant Group × Time interactions were observed for anxiety severity scores and the physical, psychological, and environmental domains of quality of life, with improvements noted only in the pranayama group. Serum cortisol levels decreased and BDNF levels increased significantly in the intervention group compared with controls. Inflammatory and metabolic parameters did not show statistically significant changes after correction, although favorable directional trends were observed. Anxiety severity and quality-of-life scores demonstrated significant correlations with cortisol, BDNF, and inflammatory and metabolic markers. Slow pranayama and savasana appear to be safe, feasible, and effective adjuncts to standard psychiatric care, improving anxiety severity and quality of life while favorably modulating stress-related physiological markers in people with anxiety disorders.
Clinical relevance
Anxiety disorders represent one of the most prevalent psychiatric conditions globally, yet pharmacological and psychotherapeutic options alone frequently leave residual symptom burden and impaired quality of life. This RCT addresses a specific evidence gap by isolating the effects of slow pranayama and savasana—as structured adjuncts to routine psychiatric care—on both psychometric outcomes and biochemical biomarkers in a diagnosed anxiety disorder population. Clinicians managing treatment-resistant or partially remitted anxiety should be aware of this emerging evidence supporting yoga-based breathing techniques as low-risk, scalable adjunctive interventions.
Key findings
1. Of 150 randomized participants with DSM-diagnosed anxiety disorders, 112 completed the 8-week trial, yielding a completion rate of approximately 74.7%; attrition should be considered when interpreting effect sizes. 2. Significant Group × Time interactions were observed for Hamilton Anxiety Rating Scale (HAM-A) scores, with clinically meaningful reductions in anxiety severity occurring exclusively in the slow pranayama and savasana intervention group, not in the routine psychiatric care control group. 3. Significant Group × Time interactions were also detected across three WHO Quality of Life-BREF domains—physical, psychological, and environmental—with improvements confined to the intervention group; the social domain was not reported as statistically significant. 4. Serum cortisol levels decreased significantly in the intervention group relative to controls following 8 weeks of slow pranayama and savasana (specific delta values and confidence intervals not reported in the abstract). 5. Brain-derived neurotrophic factor (BDNF) levels increased significantly in the intervention group compared with controls, suggesting a neuroplasticity-related mechanism of benefit. 6. Inflammatory and metabolic parameters showed directionally favorable trends in the intervention group but did not reach statistical significance after Bonferroni correction, indicating insufficient power or effect size for these secondary endpoints; correlational analyses confirmed associations between HAM-A scores, quality-of-life domains, cortisol, BDNF, and inflammatory/metabolic markers.
Practice implications
Psychiatrists and integrative medicine clinicians should consider prescribing structured slow pranayama and savasana practice as an adjunct—not a replacement—to established pharmacological or psychotherapeutic regimens for patients with anxiety disorders, given the 8-week protocol demonstrated improvements in both HAM-A scores and multiple quality-of-life domains with a favorable safety profile. Patient selection should prioritize those with residual anxiety symptoms on standard care, and the intervention should be supervised or protocol-guided given the study's structured implementation context. Biomarker monitoring (serum cortisol and BDNF) may serve as objective adjunctive tools to track physiological response, though clinicians should note that inflammatory and metabolic endpoints did not reach corrected significance and warrant evaluation in larger, adequately powered trials before routine clinical use.