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Zeros in Accelerometer Files A Comparison Study of Ten Published Nonwear Algorithms

Journal of Sports Science 2014年第1期2卷 53-61页

作者： Stephanie Crevier-Couture tracie ann barnett Jennifer O'Loughlin Angelo Tremblay Marie-Eve Mathieu Department of Kinesiology University of Montreal Montreal H3C 3J7 Canada Department of Exercise Science Concordia University Montreal H4B 1R6 Canada CHU Sainte-Justine Research Center Montreal H3T 1C5 Canada Department of Social and Preventive medicine University of MontreaL Montreal H3C 3J7 Canada Department of Kinesiology Laval University Quebec city G I V OA6 Canada

Despite the increasing use of accelerometers, the handling of zero values in data files remains understudied. Using data from the QUALITY （QUebec Adipose and Lifestyle Investigation in Youth） cohort, output from 10 published nonwear algorithms were compared in 520 children aged 8-10 years who wore an Actigraph accelerometer for 7 days. These algorithms differed by： 1） the minimal duration of consecutive zeros required to be designated as nonwear （10-90 minutes）; 2） the presence and magnitude of an allowance period, and 3） the presence of a specific time frame. Significant differences were obtained between all but two algorithms, including： 1） wear time differences up to 117 minutes per day; 2） differences in counts per minutes as high as 80; and 3） differences in sedentary time up to two hours daily. Estimates of light and moderate-to-vigorous physical activity were less affected. This study suggests that the nonwear algorithm used can have a significant effect on estimates of wear duration, overall physical activity level and sedentary time in children. Until technological developments bring to zero nonwear time, specifying the nonwear algorithm used when publishing results is essential to ensure accurate comparison between studies.

关键词： Children physical activity monitoring data reduction.

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