title: Efficacy and tolerability of yoga breathing in patients with chronic obstructive pulmonary disease: a pilot study.
abstract: OBJECTIVE
  Yoga-derived breathing has been reported to improve gas exchange in patients with chronic heart failure and in participants exposed to high-altitude hypoxia. We investigated the tolerability and effect of yoga breathing on ventilatory pattern and oxygenation in patients with chronic obstructive pulmonary disease (COPD).
  
  
  METHODS
  Patients with COPD (N = 11, 3 women) without previous yoga practice and taking only short-acting beta2-adrenergic blocking drugs were enrolled. Ventilatory pattern and oxygen saturation were monitored by means of inductive plethysmography during 30-minute spontaneous breathing at rest (sb) and during a 30-minute yoga lesson (y). During the yoga lesson, the patients were requested to mobilize in sequence the diaphragm, lower chest, and upper chest adopting a slower and deeper breathing. We evaluated oxygen saturation (SaO2%), tidal volume (VT), minute ventilation (E), respiratory rate (i>f), inspiratory time, total breath time, fractional inspiratory time, an index of thoracoabdominal coordination, and an index of rapid shallow breathing. Changes in dyspnea during the yoga lesson were assessed with the Borg scale.
  
  
  RESULTS
  During the yoga lesson, data showed the adoption of a deeper and slower breathing pattern (VTsb L 0.54[0.04], VTy L 0.74[0.08], P = .01; i>fsb 20.8[1.3], i>fy 13.8[0.2], P = .001) and a significant improvement in SaO2% with no change in E (SaO2%sb 91.5%[1.13], SaO2%y 93.5%[0.99], P = .02; Esb L/min 11.2[1.1], Ey L/min 10.2[0.9]). All the participants reported to be comfortable during the yoga lesson, with no increase in dyspnea index.
  
  
  CONCLUSIONS
  We conclude that short-term training in yoga is well tolerated and induces favorable respiratory changes in patients with COPD.
authors.affiliation: Sports Biomedical Studies Centre, University of Ferrara, Ferrara, Italy. analisa.cogo@unife.it
authors.forename: Luca
authors.initials: L
authors.lastname: Pomidori
authors.forename: Federica
authors.initials: F
authors.lastname: Campigotto
authors.forename: Tara Man
authors.initials: TM
authors.lastname: Amatya
authors.forename: Luciano
authors.initials: L
authors.lastname: Bernardi
authors.forename: Annalisa
authors.initials: A
authors.lastname: Cogo
mesh_terms: D000368:Aged; D001945:Breathing Exercises; D005260:Female; D006801:Humans; D008297:Male; D010100:Oxygen / Q000097:blood; D010865:Pilot Projects; D010991:Plethysmography; D029424:Pulmonary Disease, Chronic Obstructive / Q000097:blood / Q000503:physiopathology / Q000534:rehabilitation*; D012129:Respiratory Function Tests; D015013:Yoga
chemical_list: D010100:Oxygen