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Journal of ObesityVolume 2012 2012, Article ID 460271, 9 pages

Research ArticleActivity Promotion Laboratory, Department of Kinesiology, East Carolina University, Greenville, NC 27858, USA

Received 31 May 2011; Revised 8 August 2011; Accepted 25 August 2011

Academic Editor: Patty Freedson

Copyright © 2012 Lucas J. Carr and Matthew T. Mahar. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Purpose. To examine the accuracy of intensity and inclinometer output of three physical activity monitors during various sedentary and light-intensity activities. Methods. Thirty-six participants wore three physical activity monitors ActiGraph GT1M, ActiGraph GT3X+, and StepWatch while completing sedentary lying, sitting watching television, sitting using computer, and standing still light walking 1.0 mph, pedaling 7.0 mph, pedaling 15.0 mph intensity activities under controlled settings. Accuracy for correctly categorizing intensity was assessed for each monitor and threshold. Accuracy of the GT3X+ inclinometer function GT3X+Incl for correctly identifying anatomical position was also assessed. Percentage agreement between direct observation and the monitor recorded time spent in sedentary behavior and light intensity was examined. Results. All monitors using all thresholds accurately identified over 80% of sedentary behaviors and 60% of light-intensity walking time based on intensity output. The StepWatch was the most accurate in detecting pedaling time but unable to detect pedal workload. The GT3X+Incl accurately identified anatomical position during 70% of all activities but demonstrated limitations in discriminating between activities of differing intensity. Conclusions. Our findings suggest that all three monitors accurately measure most sedentary and light-intensity activities although choice of monitors should be based on study-specific needs.





Autor: Lucas J. Carr and Matthew T. Mahar

Fuente: https://www.hindawi.com/



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