The purpose of this research is to study postmenopausal female masters athletes to see if they will show greater myocardial stiffness and reduced exercise capacity than premenopausal females and similarly aged male masters athletes.

Inclusion Criteria:

• Longstanding history of competitive endurance athletic performance defined as >15 years of continuous athletic training for at least 7 hours per week and ongoing engagement in competitive events.

Exclusion Criteria:

• A current or prior diagnosis of cardiovascular disease as defined by the presence of structural heart disease, heart failure, symptomatic coronary artery disease, more than moderate valve disease or prior valve surgery,
• Current or recent pregnancy within 1 year
• Positive pregnancy test (study visit 1)
• Concurrent or use within 1 year of oral contraceptives or hormone replacement therapy,
• Unable to undergo a cMRI (Please refer standard clinical contraindications for MRI)

Masters athletes (40-70 yrs of age) with a longstanding history of competitive endurance athletic performance defined as >15 years of continuous athletic training for at least 7 hours per week, and ongoing engagement in competitive events, will be recruited from Mayo registry and from the local athletic community via brochures within the Dan Abraham Healthy Living Center and the Mayo Clinic Classifieds.