Acute Responses to Exercise in Females and Males With Symptomatic Atrial Fibrillation

This study is looking at how exercise affects people who have atrial fibrillation (an irregular heartbeat) and experience symptoms from it. Researchers want to understand whether men and women with AFib respond differently to exercise, which could help design better treatment programs. **You may be eligible if...** - You have been diagnosed with paroxysmal or persistent atrial fibrillation (AFib that comes and goes, or is constant) - Your heart rate is controlled at rest (below 110 beats per minute) - You have experienced symptoms from your AFib in the past 4 weeks - You are 40 years of age or older - If you are female, you are post-menopausal - You can read and understand English or French **You may NOT be eligible if...** - You currently do regular structured exercise training - You have unstable angina (chest pain), uncontrolled diabetes, or severe heart valve problems - You have an implanted heart device such as a pacemaker or defibrillator - You do not have access to the internet or a compatible smartphone or tablet Talk to your doctor to see if this trial is right for you.