In order to ascertain the reliability of Fitbit devices and evaluate their effectiveness for monitoring the physical activity of cardiac patients, the researchers evaluated 48 patients and family members participating in community-based exercise programmes. The 48 participants wore the device over four days to monitor daily step counts and minutes of moderate to vigorous physical activity (MVPA). The researchers discovered that: "Fitbit-Flex is a valid and reliable device for activity monitoring specific to predicted attainment of physical activity guideline recommendations (i.e. step counts and minutes of MVPA). It is also useful for monitoring physical activity in cardiac patients and for comparison among individuals. However, caution must be taken when using Fitbit-Flex for research purposes as it slightly over-estimates step counts and MVPA. Nonetheless, Fitbit-Flex is capable of continuously monitoring free-living conditions and for providing valuable physical activity data for clinicians, individuals and researchers to track physical activity levels."
The article "Validation of Fitbit-Flex as a measure of free-living physical activity in a community-based phase III cardiac rehabilitation population" by Muaddi Alharbi, Adrian Bauman, Lis Neubeck and Robyn Gallagher, is published in the European Journal of Preventive Cardiology.
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European Journal of Preventive Cardiology is the world's leading preventive cardiology journal, playing a pivotal role in reducing the global burden of cardiovascular disease. It is the official publication of the European Association for Cardiovascular Prevention and Rehabilitation, an association of the European Society of Cardiology. The Journal embraces all the scientific, clinical and public health disciplines that address the causes and prevention of cardiovascular disease, as well as cardiovascular rehabilitation and exercise physiology.