Validation of Two Wrist-worn Devices for the Assessment of Energy Expenditure in Cardiac Patients.
- Conditions
- Coronary Artery DiseaseHeart Failure With Reduced Ejection Fraction
- Interventions
- Device: Fitbit Charge 2Device: Mio SliceDevice: Oxycon Mobile
- Registration Number
- NCT03951740
- Lead Sponsor
- Maxima Medical Center
- Brief Summary
Improving physical activity is a core component of secondary prevention and cardiac (tele)rehabilitation. Commercially available activity trackers are frequently used to monitor and promote physical activity in cardiac patients. However studies on the validity of these devices in cardiac patients are scarce. The aim of this study is to determine the accuracy and responsiveness of two wrist-worn activity trackers, Fitbit Charge 2 (FC2) and Mio Slice (MS), for the assessment of energy expenditure (EE) in cardiac patients.
- Detailed Description
Introduction
Improving physical activity is a core component of secondary prevention and cardiac (tele)rehabilitation. Commercially available activity trackers are frequently used to monitor and promote physical activity in cardiac patients. However studies on the validity of these devices in cardiac patients are scarce. The aim of this study is to determine the accuracy and responsiveness of two wrist-worn activity trackers, Fitbit Charge 2 (FC2) and Mio Slice (MS), for the assessment of energy expenditure (EE) in cardiac patients.
Methods
Eligible patients are recruited by their cardiologist in the outpatient cardiology clinic. If a patient is willing to participate, he/she visits the Máxima Medical Centre once, to perform the study measurements.
EE assessed by both activity trackers is compared with indirect calorimetry (Oxycon Mobile) during a laboratory activity protocol consisting of 14 low-to-moderate intensity activities. The duration of the activities varies between 1 to 5 minutes, while total duration of the protocol is 39 minutes (resting time excluded) Two groups are assessed: patients with stable coronary artery disease (CAD) and patients with heart failure with reduced ejection fraction (HFrEF).
Sample size calculation
To achieve 80% power to detect an intraclass correlation coefficient (ICC) of 0.75 (excellent agreement) under the alternative hypothesis that the ICC is 0.35 (poor agreement), a sample size of 19 subjects per study group (i.e. CAD and HFrEF) is calculated.
Statistical analysis
Accuracy of FC2 and MS will be assessed by calculating mean EE and mean differences in EE compared to the criterion measure (Oxycon Mobile). To identify if agreement is between reasonable limits one-sample T-tests will be performed using mean differences. In addition, Bland-Altman plots will be created to illustrate the level of agreement with mean bias and 95% upper and lower limits of agreement (LoA). Moreover ICC using two-way mixed models with absolute agreement will used. Responsiveness of FC2 and MS will be assessed by using a paired T-test during walking and cycling at different intensities. Significance level will be set at p\<0.05 for all analyses.
Recruitment & Eligibility
- Status
- COMPLETED
- Sex
- All
- Target Recruitment
- 39
Not provided
Not provided
Study & Design
- Study Type
- INTERVENTIONAL
- Study Design
- SINGLE_GROUP
- Arm && Interventions
Group Intervention Description Group of cardiac patients Mio Slice All patients completed the study wearing two wrist-worn activity trackers and the Oxycon mobile as reference method during a laboratory activity protocol. Group of cardiac patients Fitbit Charge 2 All patients completed the study wearing two wrist-worn activity trackers and the Oxycon mobile as reference method during a laboratory activity protocol. Group of cardiac patients Oxycon Mobile All patients completed the study wearing two wrist-worn activity trackers and the Oxycon mobile as reference method during a laboratory activity protocol.
- Primary Outcome Measures
Name Time Method Agreement During a laboratory protocol consisting of 14 low-to-moderate intensity activities (39 minutes in total, resting time excluded) Energy expenditure (measured in kcal) will be extracted from both activity trackers for each separate activity of the protocol as well as for the total protocol.
Breath-by-breath oxygen uptake (VO2) and carbon dioxide production (VCO2) will be measured during the entire length of the protocol using the Oxycon Mobile (reference method). By using the Weir equation, energy expenditure (kcal) will be calculated from VO2 and VCO2.
Agreement of energy expenditure measurement is assessed by using mean differences in energy expenditure measured by the activity trackers versus the Oxycon Mobile and by calculating an intra-class correlation coefficient.
- Secondary Outcome Measures
Name Time Method Responsiveness Cycling at three different intensities (3 minutes at each intensity) and treadmill walking at three different intensities (3 minutes at each intensity)) Responsiveness (i.e. ability to detect within-patients changes of energy expenditure measurement over time) of the activity trackers will be calculated by using a paired T-test during walking and cycling at different intensities.
Trial Locations
- Locations (1)
Máxima Medical Centre
🇳🇱Veldhoven, Noord-Brabant, Netherlands