Exercise Magnetic Resonance Imaging in Patients With Obesity Associated Heart Failure

This study is using exercise MRI (cardiac MRI performed while the patient pedals a stationary bicycle) to better understand how the heart functions under stress in people with obesity-related heart failure with preserved ejection fraction (HFpEF), where the heart pumps normally but doesn't relax properly. **You may be eligible if...** - You are over 18 years old with signs and symptoms of heart failure - Your heart's pumping function (left ventricular ejection fraction) is 40% or above - Your heart failure score (HFA-PEFF) suggests preserved ejection fraction heart failure - You are in normal heart rhythm (sinus rhythm) - You are able to ride a bicycle for the exercise test - You are willing to sign informed consent **You may NOT be eligible if...** - You weigh more than 140 kg - You have atrial fibrillation or significant arrhythmias during testing - You have MRI contraindications (e.g., implanted devices, severe claustrophobia) - You have had a recent heart attack, heart procedure, or untreated severe coronary artery disease (within 3 months) - You have moderate to severe valve disease or complex congenital heart disease Talk to your doctor to see if this trial is right for you.