Aerobic Training and Cardiopulmonary Responses In Heart Failure

Inclusion Criteria: * Age 18-75, * Diagnosed with compensated HF, * BMI 18-30 kg/m², * LVEF \< 0.4, * NYHA 2-3, * Clinical symptoms have been stable for at least 2 weeks, and the dose of angiotensin-converting enzyme inhibitor/angiotensin receptor antagonist/angiotensin receptor inhibitor, beta-blocker, aldosterone inhibitor, and other drugs has been stable for at least 2 weeks. Exclusion Criteria: * History of a heart implant device within the last 6 weeks or a heart implant device or heart transplant plan within the next 12 months, * Acute coronary syndrome within the last 6 weeks, severe valvular heart disease, congenital heart disease, severe hypertrophic obstructive cardiomyopathy, acute myocarditis/pericarditis, intracardiac thrombosis, primary pulmonary hypertension, * Uncontrolled hypertension (systolic blood pressure \>200 mmHg and/or diastolic blood pressure \>110 mmHg), * Severe arrhythmias such as ventricular tachycardia, frequent multisource premature ventricular beats, high atrioventricular block, and significant QT interval prolongation during exercise testing, * Progressive dyspnea or * Loss of exercise endurance at rest within the last 3-5 days under low-intensity exercise load (\<2 MET) who have suffered myocardial ischemia, * Patients with cognitive impairment.