Effect of Beet Juice Supplementation on Vascular and Inspiratory Muscle Function

Inclusion Criteria: * 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 * Males and females (females must be postmenopausal either natural or surgical) * Able to give consent Exclusion Criteria: * Unstable angina, recent myocardial infarction or heart failure 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 ongoing or recurrent illness * Individuals who 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) * 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