Accuracy of Mobile Phone Pedometer Technology
Dr Glenn Boyce MBBS1, Dr Gayan Padmasekara MBBS2,Dr Martin Blum FRACS1
1Dept. Orthopaedics, Albury Wodonga Health, Albury, Australia, 2Dept. Orthopaedics, Bendigo Health, Bendigo, Australia
Corresponding Author: boyce_glenn@hotmail.com
Journal MTM 1:2:16-22, 2012
http://dx.doi.org/10.7309/jmtm.13
Background: Moderate to high intensity activity is an important component in weight loss. The ability to use free technology to monitor activity would provide a useful clinical tool.
Methods: Three popular pedometer mobile applications (“iSteps Lite”, “Pedometer Lite” and “Lyr Free”) were compared to a conventional pedometer. Outcome measures included step recording, speed estimate, distance recorded over a fixed distance and steps recorded during car travel.
Results: All devices show inaccuracy in step count and speed estimate at varying intensities of activity. For measurement of 100 steps at medium intensity activity, the range of recorded step counts detected at medium sensitivity was 69.3 to 101.3. Valid and reliable results for step count were seen with the control pedometer and with one program at moderate sensitivity settings for moderate and high intensity activity. The most accurate distance recorded and estimate of speed over a fixed distance was from a program with Global Positioning System (GPS) functionality.
Conclusion: It is possible to determine a step count as accurate as a control pedometer with careful selection of program and calibration. When exercising over a distance, a program with GPS functionality leads to the most accurate determination of speed estimate and distance recorded.
Key words: Pedometer, Accuracy, Mobile Phone, Weight Loss, Technology, Software