Overview

this study aims to investigate the effect of low vs high volume- high intensity interval training on functional capacity and quality of life in chronic heart failure patients

Eligibility

Inclusion Criteria:

1. Chronic stable heart failure patient with reduced ejection fraction (EF \<40)
2. Age Above 18 years old
3. Both males and females
4. The ability to provide informed consent

Exclusion Criteria:

1. Based on the Scientific Statement from the American Heart Association: contraindications for exercise Testing and Training. (Fletcher et al., 2013)
   1. Acute myocardial infarction (MI), within 2 days
   2. Ongoing unstable angina
   3. Uncontrolled cardiac tachy or brady arrhythmia with hemodynamic compromise
   4. Active endocarditis
   5. Symptomatic severe aortic stenosis
   6. Decompensated heart failure
   7. Acute pulmonary embolism, pulmonary infarction, or deep vein thrombosis
   8. Acute myocarditis or pericarditis
   9. Acute aortic dissection
   10. Physical disability that precludes safe and adequate testing or training
   11. Known obstructive left main coronary artery stenosis
   12. Hypertrophic obstructive cardiomyopathy with severe resting gradient
   13. Recent stroke or transient ischemic attack
   14. Mental impairment with limited ability to cooperate
   15. Resting hypertension with systolic or diastolic blood pressures \>200/110 mmHg
   16. Uncorrected medical conditions, such as significant anemia, important electrolyte imbalance, and hyperthyroidism
2. Acute decompensated heart failure NYHA class IV