Objectives: Identify the effects of inspiratory muscle training (IMT) on walking capacity, strength and inspiratory muscle endurance, activities of daily living, and quality of life poststroke.
Design: Double-blind randomized trial.
Setting: The Sarah Network of Rehabilitation Hospitals.
Subjects: Adult poststroke inpatients with inspiratory muscle weakness.
Interventions: The Experimental Group (EG) ( = 23) underwent IMT for 30 minutes/day, five times/week over six weeks. The Control Group (CG) ( = 27) performed sham IMT. Both groups underwent standard rehabilitation.
Main Measures: Primary outcome was post-intervention six-minute walking test (6MWT) distance. We also measured maximal inspiratory pressure (MIP), maximal expiratory pressure (MEP), inspiratory muscle endurance, activities of daily living (functional independence measure - FIM), and quality of life at baseline and post-intervention. Three months after intervention, we measured MIP, walking capacity and quality of life.
Results: Baseline characteristics were similar, with mean age 53 ± 11 years and FIM 74 ± 10p. Both groups similarly increased the walking capacity at six weeks (63 vs 67 m, = 0.803). Compared to the CG, the EG increased the inspiratory endurance (22 vs 7 cmHO, = 0.034) but there was no variation in MEP (14 vs 5 cmHO, = 0.102), MIP (27 vs 19 cmHO, = 0.164), FIM (6 vs 6, = 0.966) or quality of life (0 vs 0.19, = 0.493). Gains in both groups were sustained at three months.
Conclusion: Adding IMT to a rehabilitation program improves inspiratory muscle endurance, but does not further improve MIP, 6-MWT distance, activities of daily living or quality of life of individuals after stroke beyond rehabilitation alone.Registered in Clinical Trials, NCT03171272.
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