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Mobile Apps to Quantify Aspects of Physical Activity: a Systematic Review on its Reliability and Validity

  • Mobile & Wireless Health
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Abstract

The purpose of this study was to systematically review and evaluate the evidence on the accuracy (validity) and consistency (reliability) of mobile apps used to quantify physical activity. Systematic literature searches were conducted in Pubmed, Science Direct, Web of Science, Physiotherapy Evidence Database (PEDro), Academic Search Complete and IEEE Xplore. Studies were included if they reported on the validity and/or reliability of a mobile application aiming primarily at measuring physical activity in humans with or without pathology. The reference lists of included articles were also screened for reports not identified through electronic searches. The methodological quality of included studies was assessed by 2 independent reviewers and data extracted by one reviewer and checked for accuracy by a second reviewer. A total of 25 articles were included in this review, of which 18 refer to validity and 7 to both validity and reliability. Mean percentage difference was used as an indicator of validity and varied between 0.1% and 79.3%. Intraclass Correlation Coefficients varied between 0.02 and 0.99 indicating poor to excellent reliability. There is conflicting and insufficient evidence on the validity and reliability, respectively, of apps for measuring physical activity. Nevertheless, velocity and the place where the smartphone is carried seem to have an impact on validity.

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Correspondence to Anabela G. Silva.

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This work was funded by SmartWalk – Smart Cities for Active Seniors, reference number SAICT-POL/24293/2016. All authors declare no conflicts of interest.

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Silva, A.G., Simões, P., Queirós, A. et al. Mobile Apps to Quantify Aspects of Physical Activity: a Systematic Review on its Reliability and Validity. J Med Syst 44, 51 (2020). https://doi.org/10.1007/s10916-019-1506-z

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