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Portable global positioning units to complement accelerometry-based physical activity monitors.

Daniel A Rodríguez1, Austin L Brown, Philip J Troped

  • 1Department of City and Regional Planning, University of North Carolina, Chapel Hill, NC 27599-3140, USA. danrod@email.unc.edu

Medicine and Science in Sports and Exercise
|November 19, 2005
PubMed
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Combining accelerometry and GPS provides precise physical activity location data. This approach helps understand how the environment influences activity, revealing links between neighborhood characteristics and where people engage in moderate to vigorous physical activity.

Area of Science:

  • Epidemiology
  • Geographic Information Systems (GIS)
  • Physical Activity Measurement

Background:

  • Accurate physical activity measurement is crucial for public health research.
  • Understanding the environmental context of physical activity is key to designing effective interventions.
  • Portable Global Positioning System (GPS) units offer potential for spatial tracking.

Purpose of the Study:

  • To evaluate the precision and reliability of portable GPS units for tracking movement.
  • To assess the feasibility of combining accelerometry with GPS data to pinpoint physical activity locations.
  • To explore the relationship between neighborhood characteristics and the location of physical activity.

Main Methods:

  • Assessed GPS unit validity and interunit reliability using geodetic points and Bland-Altman analysis.

Related Experiment Videos

  • Collected concurrent GPS and accelerometer data from 35 participants over 3 days in free-living conditions.
  • Classified moderate and vigorous physical activity (MVPA) bouts by location (inside/outside home neighborhood) and compared neighborhood attributes.

    • Main Results:

    • GPS units demonstrated sufficient precision (average distance to geodetic point: 3.02m) and reliability.
    • GPS data captured 67% of moderate and vigorous physical activity (MVPA) time, with 46% occurring within participants' home neighborhoods.
    • Individuals with most MVPA in their neighborhoods resided in areas with higher population density, housing density, street connectivity, and more parks.

    Conclusions:

    • Portable GPS units provide precise movement tracking suitable for complementing accelerometry.
    • Integrating activity monitor and locational data is a promising method for detailed physical activity analysis.
    • Examining the location of physical activity can elucidate the environment-activity relationship.