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Mobile Device Accuracy for Step Counting Across Age Groups.

François Modave1, Yi Guo1, Jiang Bian1

  • 1University of Florida, Department of Health Outcomes and Policy, Gainesville, FL, United States.

JMIR Mhealth and Uhealth
|June 30, 2017
PubMed
Summary
This summary is machine-generated.

Wearable device accuracy for step counting varies by age, with some popular devices undercounting steps in older adults. This highlights potential issues for health interventions relying on activity trackers.

Keywords:
adultsdevicesmobilephysical activityweight reduction

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Area of Science:

  • Health Informatics
  • Biomedical Engineering
  • Human Movement Science

Background:

  • Physical activity recommendations are unmet by most Americans.
  • Wearable devices and smartphones are increasingly used for physical activity tracking in interventions.
  • Accuracy of wearable step counting and factors affecting it (age, BMI) require investigation.

Purpose of the Study:

  • To assess the step-counting accuracy of recent mobile devices.
  • To evaluate accuracy across three distinct age groups (18-39, 40-64, 65-84 years).

Main Methods:

  • 60 participants completed 1000-step walks on a treadmill.
  • Tested smartphones (waist) and wrist-based devices.
  • Devices were swapped between dominant/non-dominant sides and walks.
  • Age, BMI, and dominant hand were recorded.

Main Results:

  • Fitbit Surge significantly undercounted steps across all age groups.
  • Samsung Gear S2 undercounted steps in the 40-64 age group.
  • Nexus 6P undercounted steps in the 65-84 age group.

Conclusions:

  • Most tested mobile devices are accurate for young adults but may undercount steps in older individuals.
  • Age is a significant factor influencing step-counting accuracy in wearable devices.
  • Findings are crucial for clinical interventions utilizing activity trackers for weight management and other health goals.