High Intensity Interval Training Versus Continuous Training on Ventricular Remodeling in Chronic Heart Failure Patients

This study aimed to study the effect of training programs with high intensity interval training (HIIT) versus moderate continuous training(MCT) on ventricular remodeling, endothelial function, and quality of life in chronic heart failure patients. Forty male patients with chronic heart failure secondary to ischemic heart disease were selected from outpatient heart failure clinic at National Heart Institute. Their mean age was 54.0 +/- 2.72 years old and ejection fraction <40%. They were randomized to either moderate continuous training (50-70% of peak heart rate) or high intensity interval training (90-95% of peak heart rate), for 40 min 3 times per week for 12 weeks. 2D echocardiography for assessment of left ventricular systolic dysfunction, and brachial artery flow-mediated dilation (BAFMD) and quality of life (SF-36, Minnesota living with HF questionnaire (MLHFQ)) Before and after training program were collected .the statistical analysis revealed that ejection fraction increased more with HIIT program than MCT program (30.41% versus 15.01%., P<0.0001), LVEDD and LVESD improved significantly in both groups with no significant difference between groups, Improvement in BAFMD was greater with high intensity interval training (P<0.0001). (MLHFQ) improved significantly in both groups. It was concluded that high intensity interval training is superior to moderate continues training for improving systolic function and endothelial function in chronic heart failure patients.