Patients with a history of Spontaneous Coronary Artery Dissection and/or Fibromuscular Dysplasia will undergo three exercise tests.

Subjects will undergo three exercise tests, each separated by at least 48 hours:

• Symptom-limited cardiopulmonary exercise test (CPET): Patients will cycle upright starting at 0W (3 min) before the workload is increased by 10-35W·min-1 in a ramp fashion (like cycling up a progressively steeper hill) until volitional exhaustion for the determination of V̇O2peak and Wpeak
• Two-stage submaximal constant power exercise test: Following a 5-minute warm-up (10-20 W), participants will cycle in the moderate intensity domain for 25 minutes followed by 25 minutes in the heavy intensity domain.
• Six different resistance exercises of varying intensities: Participants will perform three sets of six different resistance exercises: chest press; lateral raises; abdominal crunches; planks; leg press; weighted lunges

Systemic blood pressure will be measured at rest, at peak exercise, and for 5 minutes of recovery after exercise via finger photoplethysmography and reported as mmHg

The Dartmouth COOP Functional Assessment Charts are a set of patient-reported, pictorial tools used to measure physical, mental, and social functioning. The tool includes 9 questions that are rated on scores from 1-5, with higher scores indicating worse function.

The Duke Activity Status Index (DASI) is a self-administered questionnaire that measures a patient's functional capacity. It consists of 12 yes/no questions. Scores range from 0 to 58.2, with higher scores indicating better exercise capacity.

The International Physical Activity Questionnaire Short Form (IPAQ-SF) is a 7-item self-reported questionnaire where subjects report time spent being physically active in the last 7 days reported hours per day or minutes per day.

Perceived exertion (breathlessness and leg fatigue) will be obtained using the Borg 0-10 scale.

Blood lactate concentration [La-]b will be measured via analysis of a pinprick point-of-care lactate test (via the earlobe) at rest, during exercise, and at peak exercise.