In this new review, the authors included 15 trials (n=1,048 participants), which evaluated the effects of at least 2 weeks of yoga for people with asthma of any duration and severity. There is moderate quality evidence that yoga can improve quality of life (mean difference 0.57 points on a 7-point scale; 95% confidence interval (CI) 0.37 to 0.77) and symptoms (standardised mean difference 0.37 standard deviation units, 95% CI 0.09 to 0.65) compared to usual care, no intervention or sham intervention. There is low quality evidence for a reduction in medication dosage (risk ratio 5.35; 95% CI 1.29 to 22.11). Lung function did not change – mean change from baseline forced expiratory volume in one second was 0.04 L (95% CI -0.10 to 0.19). There were no serious adverse events associated with yoga. More trials with large sample sizes and high methodological rigor are needed to firm conclusions about the effects of yoga in people with asthma.
Yang Z-Y et al. Yoga for asthma. Cochrane Database of Systematic Reviews 2016;Issue 4