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a calibration protocol for population-specific accelerometer cut-points in children儿童对特定人群加速度计校准协议分割点
A Calibration Protocol for Population-Specific Accelerometer Cut-Points in Children 1 2 3,4 5 Kelly A. Mackintosh *, Stuart J. Fairclough , Gareth Stratton , Nicola D. Ridgers 1 Faculty of Education, Community and Leisure, Liverpool John Moores University, Liverpool, United Kingdom, 2 Research Institute for Sport and Exercise Sciences, Liverpool John Moores University, Liverpool, United Kingdom, 3 College of Human and Health Sciences, Swansea University, Swansea, Wales, United Kingdom, 4 School of Sports Science, Exercise and Health, The University of Western Australia, Perth, Australia, 5 Centre for Physical Activity and Nutrition Research, Deakin University, Victoria, Australia Abstract Purpose: To test a field-based protocol using intermittent activities representative of children’s physical activity behaviours, to generate behaviourally valid, population-specific accelerometer cut-points for sedentary behaviour, moderate, and vigorous physical activity. Methods: Twenty-eight children (46% boys) aged 10–11 years wore a hip-mounted uniaxial GT1M ActiGraph and engaged in 6 activities representative of children’s play. A validated direct observation protocol was used as the criterion measure of physical activity. Receiver Operating Characteristics (ROC) curve analyses were conducted with four semi-structured activities to determine the accelerometer cut-points. To examine classification differences, cut-points were cross-validated with free-play and DVD viewing activities. Results: Cut-points of #372, .2160 and .4806 countsNmin21 representing sedentary, moderate and vigorous intensity thresholds, respectively, provided t
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