Effect of Beet Juice Supplementation on Vascular and Inspiratory Muscle Function

Who May Qualify: - Adults with coronary artery disease (CAD) based on an angiogram \>50% stenosis in any major epicardial vessel or history of myocardial infarction or history of coronary revascularization. - Considered to have stable CAD on optimal medical therapy - 60 to 85 years of age - Men and women (women must be postmenopausal either natural or surgical) - Able to give consent Who Should NOT Join This Trial: - Ejection fraction \<50%, unstable angina, recent myocardial infarction within 6 months - Coronary revascularization, including percutaneous coronary intervention and coronary artery bypass graft or thoracic surgery within 6 months. - Stroke, obstructive pulmonary disease, hepatitis B, C, HIV, seizures, or other relevant on-going or recurrent illness - Individuals that have participated in respiratory training within the last 12 months or cardiac rehabilitation within the last 6 months - Uncontrolled hypertension - Use of tobacco products including smoking traditional or e-cigarettes - Use of hormone replacement therapy in women or men (e.g., estrogen, progesterone or testosterone) - Regular aerobic exercise training - Unwilling to stop using mouthwash at least 1 week before the start of the study and during study participation - Unwilling to remain weight stable during study participation Always talk to your doctor about whether this trial is right for you.