Copyright © 1998 by the European Society of Cardiology.
A randomized controlled trial of inspiratory muscle training in stable chronic heart failure
a Department of Respiratory, University Hospital, Nottingham, U.K.
b Department of Cardiovascular Medicine, University Hospital, Nottingham, U.K.
accepted February 25, 1998
Aims To assess whether a domiciliary programme of specific inspiratory muscle training in stable chronic heart failure results in improvements in exercise tolerance or quality of life.
Methods and results We conducted a randomized controlled trial of 8 weeks of inspiratory muscle training in 18 patients with stable chronic heart failure, using the Threshold\Rtrainer. Patients were randomized either to a training group inspiring for 30min daily at 30% of maximum inspiratory mouth pressure, or to a control group of ‘sham’ training at 15% of maximum inspiratory mouth pressure. Sixteen of the 18 patients completed the study. Maximum inspiratory mouth pressure improved significantly in the training group compared with controls, by a mean (SD) of 25·4 (11·2) cmH2O (P=0·04). There were, however, no significant improvements in treadmill exercise time, corridor walk test time or quality of life scores in the trained group compared with controls.
Conclusion Despite achieving a significant increase in inspiratory muscle strength, this trial of simple domiciliary inspiratory muscle training using threshold loading at 30% of maximum inspiratory mouth pressure did not result in significant improvements in exercise tolerance or quality of life in patients with chronic heart failure.
Key Words: Chronic heart failure • inspiratory muscle training • threshold loading
f1 Correspondence: W. J. M. Kinnear, University Hospital, Nottingham NG7 2UH, U.K.
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