Exercise Capacity According to Coronary Microvascular Dysfunction and Body Composition

Inclusion Criteria: * Age 20 to 80 * Typical/atypical chest pain or ischemic symptoms including dyspnea * No significant coronary artery stenosis (\>50% stenosis) in coronary angiography or computed tomography * Left ventricular ejection fraction ≥50% Exclusion Criteria: * More than moderate valvular heart disease * Congenital heart disease * Chronic renal failure (estimated glomerular filtration rate \<30 ml/min/1.73m2) or end-stage renal failure undergoing hemodialysis or peritoneal dialysis * Asthma, chronic obstructive pulmonary disease and primary pulmonary hypertension * Receiving anticancer drugs * Vasculitis associated with autoimmune diseases * Patients with difficulty in performing exercise load evaluation (treadmill, bicycle ergometer) * Atrial fibrillation * Atrioventricular block with more than second degrees, symptomatic bradycardia, cryo-node failure syndrome, Wolff-Parkinson-White (WPW) patients