Respiratory resistance feedback in the treatment of bronchial asthma in adults.

Two studies evaluated feedback of total respiratory resistance of the airways (TRR) as a treatment for adults with moderate to severe chronic bronchial asthma. Respiratory function tests and questionnaires were used to select the patients and to assess treatment effects. Study I provided eight biofeedback sessions in four weeks (each session containing four, 3-min training trials) plus three pre-treatment and three post-treatment sessions. Over the eight treatment sessions biofeedback failed to produce any significant improvements, although overall the nine patients showed lower mean initial TRR values at the three post-treatment sessions compared with the three pre-treatment sessions. Patients consistently showed improvement following bronchodilator administration at the end of every session. In study II, biofeedback was provided in one intensive session of 20, 2-min trials. While careful instruction about biofeedback was provided to subjects, and more post-treatment measures were included, no significant improvements were shown following biofeedback, but were shown following bronchodilator administration.

Relaxation therapy in asthma: a critical review.

This review discusses the relationship between the psychological and physiological factors responsible for airways in asthma and indicates the mechanisms by which psychological methods of treatment may influence airway caliber. The effects of mental and muscular relaxation therapy, systematic desensitization, and biofeedback-assisted relaxation are evaluated in children and adults with asthma. The methodology and results of studies are analyzed critically to present a balanced opinion of the subjective and objective effects of these methods of treatment. Muscular relaxation therapy alone appears to have no effect. Certain mental relaxation techniques, such as autogenic training and transcendental mediation, systematic desensitization, and biofeedback-assisted relaxation, can produce subjective improvement as well as clinically significant improvement in respiratory function and other objective parameters. As with any therapy the response is variable and is influenced by factors such as age and severity of asthma.