THE EFFECTS OF INSPIRATORY MUSCLE TRAINING IN PATIENTS WITH CYSTIC-FIBROSIS

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Abstract
This study evaluated whether inspiratory muscle training (IMT) could increase inspiratory muscle strength and endurance and exercise performance in 11 patients with cystic fibrosis (CF) with moderately severe airflow limitation. IMT consisted of breathing through an inspiratory resistance (IR) for 15 min twice daily for 4 wk, preceded or followed by a 4-wk control period. After IMT there was an increase in inspiratory muscle strength, as measured by maximal inspiratory mouth pressure at functional residual capacity, from 74 .+-. 18 cm H2O before training to 81 .+-. 12 cm H2O after training, mean .+-. 1 SD, P < 0.025, and in inspiratory muscle endurance as measured by the maximal IR tolerated for 10 min. Limitation of performance in the progressive exercise test was related to increased airflow limitation and, possibly, to poor nutrition. Mean exercise performance during progressive or submaximal exercise testing did not change after training. This form of IMT improved inspiratory muscle strength and endurance but had little effect on exercise performance in patients with CF.

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