Breathing Exercises for Asthma : Evidence and Practice

Mimicking Pranayama yoga in clinicaltrials of breathing techniques Slow breathing retraining exercises using Pink Citylung exerciser (Pink City represents Jaipur India) mouthpiece attached to a disc with a selection ofapertures of 2-5 mm, any one of which can beselected, through which all inspired and expired airmust pass apertures carry a one-way valve which halves thecross-sectional area of the aperture during expiration,imposing a 1:2 ratio on the duration of inspiration andexpiration Smaller aperture slower respiratory rate