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A Method for Quantifying Upper Limb Performance in Daily Life Using Accelerometers
07:24

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Published on: April 21, 2017

Accelerometer-determined steps per day in US adults.

Catrine Tudor-Locke1, William D Johnson, Peter T Katzmarzyk

  • 1Pennington Biomedical Research Center, Baton Rouge, LA 70808, USA. Tudor-Locke@pbrc.edu

Medicine and Science in Sports and Exercise
|June 12, 2009
PubMed
Summary
This summary is machine-generated.

US adults average nearly 10,000 daily steps, but censoring inactivity suggests closer to 6,500. This study provides population-specific step data using accelerometers.

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Area of Science:

  • Physical activity epidemiology
  • Wearable sensor technology

Background:

  • The 2005-2006 National Health and Nutrition Examination Survey (NHANES) provided accelerometer-derived step data.
  • ActiGraph AM-7164 accelerometers have lower sensitivity thresholds than pedometers, potentially inflating step counts.

Purpose of the Study:

  • To determine population- and sex-specific daily step counts using accelerometer data.
  • To analyze step data with and without censoring low-intensity activity.

Main Methods:

  • Analysis of 3744 participants aged 20+ years with at least 10 hours of valid monitoring data.
  • Calculation of mean steps per day, both uncensored and censored at <500 activity counts per minute.

Main Results:

  • US adults averaged 9676 +/- 107 uncensored steps per day.
  • Censored steps indicated an average of 6540 +/- 106 steps per day.

Conclusions:

  • Nationally representative data suggest US adults take approximately 10,000 uncensored steps daily.
  • The <500 activity counts per minute threshold is a valuable method for censoring inactivity in accelerometer data until a better conversion factor is established.