Accuracy of smartphone applications and wearable devices for tracking physical activity data.

By Meredith A Case, Holland A Burwick, K. Volpp, Mitesh S. Patel. Journal of the American Medical Association (JAMA), 2015

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Worldwide Impact of COVID-19 on Physical Activity: A Descriptive Study (2020, background): “Limitations of this study include sampling bias due to the reliance on smartphone and app ownership, measurement error from smartphone-measured step counts, variability in smartphone carry and use habits, no assessment of activity intensity, and inability to capture nonstepping exercise (5).”
Reliability and Validity of Commercially Available Wearable Devices for Measuring Steps, Energy Expenditure, and Heart Rate: Systematic Review (2020, background): “However, research has shown variation in step count among devices, and the applicability of these metrics may vary by device brand and device type [6].”
Systematic review of the validity and reliability of consumer-wearable activity trackers (2015, methodology): “(1)UP worn on the wrist [33, 35, 40, 42, 47, 48] and (2)UP24 worn on the wrist [30, 45].”
Measuring Engagement in eHealth and mHealth Behavior Change Interventions: Viewpoint of Methodologies (2018, background): “Therefore, communicating research findings about the validity of such measures [109,110]) and conducting pilot tests and validity studies of new measures may be necessary to”