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Related Experiment Videos

Commercially available pedometers: considerations for accurate step counting.

Edward L Melanson1, Joan R Knoll, Melanie L Bell

  • 1Center for Human Nutrition, University of Colorado Health Sciences Center, Denver, CO 80262, USA. Ed.melanson@uchsc.edu

Preventive Medicine
|July 1, 2004
PubMed
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Pedometers are less accurate at slower walking speeds, with accuracy decreasing with age and higher body mass index (BMI). Piezoelectric pedometers are more accurate than spring-levered models at low speeds.

Area of Science:

  • Biomechanics
  • Human Movement Analysis
  • Wearable Technology

Background:

  • Commercially available pedometers often undercount steps, particularly at slower walking speeds.
  • Factors such as age, obesity, and walking speed influence pedometer accuracy.
  • This study compares piezoelectric and spring-levered pedometer accuracy at slow speeds.

Purpose of the Study:

  • To examine how age, obesity, and self-selected walking speed affect pedometer accuracy.
  • To compare the accuracy of piezoelectric versus spring-levered pedometers at slow walking speeds.

Main Methods:

  • Study 1 involved 259 subjects walking on a treadmill at self-selected speeds, using spring-levered pedometers.
  • Study 2 involved 32 subjects walking at slow speeds (1.0-2.6 MPH) using both spring-levered and piezoelectric pedometers.

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Main Results:

  • Pedometer accuracy decreased with increasing age, weight, and BMI.
  • Accuracy was <71% below 2.0 MPH, 74-91% between 2.0-3.0 MPH, and 96% above 3.0 MPH.
  • Piezoelectric pedometers showed superior accuracy (>97%) compared to spring-levered pedometers (52-95%) at speeds between 1.8-2.0 MPH.

Conclusions:

  • Pedometer accuracy declines significantly at walking speeds below 3.0 MPH.
  • For individuals with slower natural walking speeds, such as the elderly, piezoelectric pedometers are recommended due to their higher sensitivity and accuracy.