Effectiveness of mind-body exercises in chronic respiratory diseases: an overview of systematic reviews with meta-analyses.

Purpose: To gather evidence on the effectiveness and safety of qigong, tai chi, and yoga to modulate symptoms associated with chronic respiratory diseases.
Methods: A search of systematic reviews was conducted in CINHAL, Embase, PubMed, PsycINFO, SPORTDiscus, and the Cochrane Library from inception to November 2022. Systematic reviews with meta-analyses investigating physical and psychological measures were eligible. The methodological quality of systematic reviews (AMSTAR-2), the spin of information in abstracts, and the overlap of primary studies were explored.
Results: Twenty-seven systematic reviews involving 37 000 participants, 146 studies, and 150 meta-analyses were included. Reviews investigated asthma ( n  = 4) and chronic obstructive pulmonary disease (COPD) ( n  = 23). Most reviews discussed their findings without considering the risk of bias of primary studies. The overlap ranged between slight (5%) and very high (35%). Yoga was better than control interventions to improve symptoms related with asthma. In adults with COPD, qigong improved dyspnoea, exercise endurance, lung function, and quality of life, while tai chi and yoga increased exercise endurance.
Conclusions: The impact of yoga on symptoms associated with asthma varied depending on the lung function parameter and the control group. Qigong, tai chi, and yoga could be effective to improve COPD-related symptoms, especially exercise endurance.