Elizabeth H. Dineen, D.O.

Dr. Elizabeth H. Dineen is a sports cardiologist and noninvasive cardiologist at Mayo Clinic in Jacksonville, Florida, specializing in the cardiovascular care of athletes and active individuals throughout Florida, the Southeastern United States and beyond. Her clinical expertise focuses on sports cardiology, athlete heart health, and exercise physiology, helping patients to safely optimize their performance while reducing cardiovascular risk.

Dr. Dineen provides comprehensive care for athletes at all levels – from competitive athletes to tactical athletes, such as military, law enforcement, and first responders – as well as highly active individuals seeking expert cardiovascular evaluation and performance guidance.

Dr. Dineen’s practice centers on advanced evaluation, risk assessment and performance optimization, including:

• Preparticipation cardiovascular screening for athletes, ensuring safe clearance for sports participation.
• Risk stratification for exercise participation in the setting of known cardiac conditions, such as coronary artery disease, arrhythmia, and structural heart disease.
• Athlete return-to-play evaluation, with individualized recommendations based on clinical findings.
• Cardiorespiratory fitness counseling, including incorporation of VO2 max and other cardiopulmonary exercise testing (CPET) metrics into overall treatment plan, working closely with exercise scientist colleagues to develop a collaborative plan.
• Sports cardiology consultations for endurance athletes, masters athletes, and tactical professionals.

She has particular expertise in differentiating physiologic "athlete's heart" adaptations from underlying cardiac disease, a critical distinction in the care of high-performance individuals.

Dr. Dineen incorporates leading-edge diagnostic tools to guide personalized care plans, including:

• Echocardiography and stress echocardiography.
• Cardiopulmonary exercise testing (CPET) for performance and risk evaluation.
• Electrocardiography and advanced imaging for comprehensive cardiac assessment.

Her approach combines precision diagnostics with actionable insights to help athletes safely improve performance and long-term heart health.

Dr. Dineen serves as a regional referral expert for sports cardiology in Florida and the Southeast, caring for athletes traveling from across the region and beyond for specialized cardiovascular evaluation.

She is a recognized leader in sports cardiology at both the national and international levels. She serves on national leadership councils in sports cardiology for both the American College of Cardiology (ACC) and the American Heart Association (AHA), was selected to serve on the writing group for the ACC/AHA Scientific Statement, Clinical Considerations for Competitive Sports Participation for Athletes With Cardiovascular Abnormalities, has contributed to a European Society of Cardiology (ESC) consensus document, and has been an invited speaker at the European Association of Preventive Cardiology (EAPC) Sports Cardiology Conference. These leadership and scholarly contributions reflect her commitment to advancing evidence-based cardiovascular care for athletes worldwide.

Dr. Dineen's work bridges performance medicine and preventive cardiology, helping athletes and active individuals safely optimize performance while supporting lifelong heart health.

"Athletes require a highly individualized approach," says Dr. Dineen. "My goal is to understand each patient's physiology, performance goals, and risk profile to provide safe, evidence-based guidance that supports both peak performance and lifelong heart health."

Outside of medicine, Dr. Dineen enjoys distance running and organizing running groups, reading, hanging out with her family, exploring Jacksonville and supporting local sports teams.