The effect of biofeedback training on respiratory resistance of asthmatic children.

In a pilot study four children with severe asthma were trained to lower their respiratory resistance by means of biofeedback training techniques. Total respiratory resistance measured continuously by the forced oscillation method was used as the feedback signal. Each child demonstrated lowered respiratory resistance after most sessions. Results were comparable with the improvement seen after bronchodilator inhalation therapy. A nonasthmatic child demonstrated no significant changes of respiratory resistance after using the same techniques. Arguments are presented in support of the hypothesis that changes in total respiratory resistance were primarily due to changes in lower airway resistance. Lowering of airway resistance in asthmatic children by use of biofeedback appears possible; its promise calls for further clinical evaluation.