Observational, Non-Interventional Study Supporting Validation of VO2Max Estimation Methods Using Results in Patients Receiving Standard of Care Cardiopulmonary Exercise Tests (CPET)

Inclusion Criteria: 1. Willing and able to comply with protocol procedures and available for the duration of the study. 2. Willing to sign and date informed consent document for study participation. 3. Participant is undergoing the Cardiopulmonary Exercise Test (CPET) as Standard of Care Exclusion Criteria: 1. Participant is pregnant, lactating or ≤30 days post-partum. 2. Participant has limited or no intrinsic sinus node function (i.e. chronic atrial pacing). • If participant has an indwelling cardiac device and programming cannot be sufficiently ascertained to assure sinus node competence and lack of atrial pacing, the patient should be excluded. 3. Barostim (™) or similar noncardiac electrical pulse generating device in situ. 4. Complex congenital heart disease (even repaired or palliated) with the following exception: • Biventricular physiology without severe valvar dysfunction (e.g. free pulmonary insufficiency) at the discretion of the investigator. 5. Any history of allergy to adhesive 6. Any cognitive or physical limitations that, in the opinion of the investigator, limits the participant's ability to fully follow study procedures and/or reach a respiratory exchange ratio of 1.0.