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Physical activity characterization: does one site fit all?

Cain C T Clark1,2,3,4, Glauber C Nobre5, John F T Fernandes3

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The best location for a wrist-worn accelerometer to accurately measure physical activity depends on the specific research goals. No single site is universally optimal for classifying all activities.

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Area of Science:

  • Biomechanics
  • Kinesiology
  • Wearable Technology

Background:

  • Wrist-worn accelerometers are increasingly used for physical activity assessment.
  • The accuracy of wrist placement compared to other body sites remains largely unexplored.

Purpose of the Study:

  • To review the relative accuracy of different accelerometer placement sites.
  • To evaluate the impact of analytical techniques on physical activity classification.

Main Methods:

  • Systematic literature search of Web of Science, PubMed, and Google Scholar.
  • Inclusion of English-language studies published up to December 2017.
  • Focus on studies using a single accelerometer to characterize physical activity and report accuracy.

Main Results:

  • 19 studies met the eligibility criteria after screening 118 articles.
  • Variability in accelerometer site and analytical technique accuracy was observed.

Conclusions:

  • The optimal accelerometer site and analytical technique are context-dependent.
  • Site selection should be guided by research design and the specific activities being measured.