Effect of respiratory exercises on asthma. The Pink City lung exerciser

In this controlled clinical trial 12 patients with mild asthma in the form of nocturnal precipitation were studied over a two-week period. Yoga breathing exercises using a Pink City lung exerciser alone or with hot, humid air or placebo were compared. Five of the 12 asthmatics showed highly significant increases in peak expiratory flow rate with the lung exerciser alone, while 8 of the 12 showed highly significant increases with exercise using hot, humid air. The frequency of nocturnal wheezing also declined. It appears that slow breathing along and in combination with hot, humid air has a nonspecific bronchoprotective or bronchorelaxing effect.