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Measuring physical activity during US Army Basic Combat Training: a comparison of 3 methods.

Jan E Redmond1, Bruce S Cohen, Kathleen Simpson

  • 1US Army Institute for Environmental Medicine, Natick, MA.

U.S. Army Medical Department Journal
|October 23, 2013
PubMed
Summary

Measuring physical activity (PA) in US Army Basic Combat Training (BCT) requires multiple tools. ActiGraph accelerometers best capture PA intensity, while PAtracker and logs excel at body position and PA type for Soldier readiness.

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Area of Science:

  • Military Science
  • Exercise Physiology
  • Biomedical Engineering

Background:

  • Understanding physical activity (PA) demands in US Army Basic Combat Training (BCT) is crucial for Soldier readiness and resilience.
  • This study evaluated agreement among three distinct PA measurement instruments within the BCT setting.

Purpose of the Study:

  • To determine the agreement between ActiGraph accelerometers, PAtracker, and daily PA logs for measuring physical activity during BCT.
  • To assess the reliability of different instruments in capturing various aspects of physical exertion, including intensity, body position, and activity type.

Main Methods:

  • Twenty-four recruits per company (11 companies) wore ActiGraph accelerometers and completed PA logs over 8 weeks of BCT.
  • PAtracker, a direct observation tool, recorded PA for one recruit per company.
  • Data analyzed included PA intensity, body positions, and external loads; correlations and Bland-Altman methods assessed instrument agreement.

Main Results:

  • Weak correlations were observed between ActiGraph and PAtracker for PA intensity (r=-0.052 to 0.302).
  • Weak positive correlations were found between PAtracker and PA logs for body position and PA type (r=0.033 to 0.268).
  • Significant disagreement was found between instruments for most PA intensity, body position, and type measures, with agreement only for sitting and walking.

Conclusions:

  • ActiGraph accelerometers are most effective for measuring PA intensity during BCT.
  • PAtracker and daily PA logs are better suited for capturing body position and PA type in the BCT environment.
  • Utilizing multiple PA measurement instruments is essential for a comprehensive characterization of the physical demands encountered during BCT.