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Abstract
Cardiac autonomic dysfunction is associated with risk of cardiovascular mortality in patients with congestive heart failure. Analysis of heart rate variability (HRV) is an important, widely used method for assessing cardiac autonomic regulation. To find out whether the diaphragmatic training could induce change on heart rate variability in patients with congestive heart failure. Thirty male patients with congestive heart failure, their age ranged from 45 to 60 years, were assigned into two groups equal in number. First group (study): including 15 patients participated in a supervised diaphragmatic training program using inspiratory muscle trainer (IMT), 60 minutes, 3 sessions /week for 12 weeks in addition to their medical treatment. Second group (control) including 15 patients received their medical treatment only. Heart rate and heart rate variability were measured pre and post study using EGG. Statistical analysis revealed a significant improvement of heart rate mean difference for study group (6.66± 2.94) compared to control group (2.60 ± 3.29) and significant improvement(increase) in HRV (15.71 ± 1.06) in study group compared to control group (13.18 ± 0.87). Parasympathetically modulated HRV of the patients in study group increased significantly (17.94%: P > 0.01) compared to control group. Diaphragmatic training using IMT could increase autonomic modulation of cardiac function in patients with congestive heart failure