Am. J. Respir. Crit. Care Med., Volume 160, Number 2, August 1999, 500-507

Cycle Ergometer and Inspiratory Muscle Training in Chronic Obstructive Pulmonary Disease

JANET L. LARSON, MARGARET K. COVEY, SCOTT E. WIRTZ, JEAN K. BERRY, CHARLES G. ALEX, W. EDWIN LANGBEIN, and LONNIE EDWARDS

University of Illinois at Chicago, Chicago, Illinois; Hines V. A. Hospital, Hines, Illinois; and Loyola University Stritch School of Medicine, Maywood, Illinois

In patients with chronic obstructive pulmonary disease (COPD) the intensity of aerobic training is limited by dyspnea. Improving strength of the inspiratory muscles could enhance aerobic exercise training by reducing exercise-related dyspnea. We examined effects of home-based inspiratory muscle training (IMT) and cycle ergometry training (CET) in 53 patients with moderate to severe COPD (FEV₁% pred, 50 ± 17 [mean ± SD]). Patients were randomly assigned to 4 mo of training in one of four groups: IMT, CET, CET + IMT, or health education (ED). Patients were encouraged to train to the limits of their dyspnea. Inspiratory muscle strength and endurance increased in IMT and CET + IMT groups compared with CET and ED groups (p < 0.01). Peak oxygen uptake increased and heart rate, minute ventilation, dyspnea, and leg fatigue decreased at submaximal work rates in the CET and CET + IMT groups compared with the IMT and ED groups (p < 0.01). There were no differences between the CET and CET + IMT groups. Home-based CET produced a physiological training effect and reduced exercise-related symptoms while IMT increased respiratory muscle strength and endurance. The combination of CET and IMT did not produce additional benefits in exercise performance and exercise-related symptoms. This is the first study to demonstrate a physiological training effect with home-based exercise training.

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