Validation of Two Wrist-worn Devices for the Assessment of Energy Expenditure in Cardiac Patients.

Energy expenditure (kcal) assessed by this activity tracker will be compared with indirect calorimetry (Oxycon Mobile) during a laboratory activity protocol. Two groups will be assessed: patients with stable coronary artery disease (CAD) and patients with heart failure with reduced ejection fraction (HFrEF).

Energy expenditure (kcal) assessed by this activity tracker will be compared with indirect calorimetry (Oxycon Mobile) during a laboratory activity protocol. Two groups will be assessed: patients with stable coronary artery disease (CAD) and patients with heart failure with reduced ejection fraction (HFrEF).

"The Oxycon Mobile will be used as the reference method/golden standard to calculate energy expenditure (kcal). This device (consisting of a face mask and gas analyzer unit) will be worn during the entire laboratory activity protocol.~Two groups will be assessed: patients with stable coronary artery disease (CAD) and patients with heart failure with reduced ejection fraction (HFrEF)."