PURPOSE: The present study examined various accelerometer nonwear definitions and their impact on detection of sedentary time using different ActiGraph models, filters, and axes. METHODS: In total, 61 youth (34 children and 27 adolescents; aged 5-17 y) wore a 7164 and GT3X+ ActiGraph on a hip-worn belt during a 90-minute structured sedentary activity. Data from GT3X+ were downloaded using the Normal filter (N) and low-frequency extension (LFE), and vertical axis (V) and vector magnitude (VM) counts were examined. Nine nonwear definitions were applied to the 7164 model (V), GT3X+LFE (V and VM), and GT3X+N (V and VM), and sedentary estimates were computed. RESULTS: The GT3X+LFE-VM was most sensitive to movement and could accurately detect observed sedentary time with the shortest nonwear definition of 20 minutes of consecutive "0" counts for children and 40 minutes for adolescents. The GT3X+N-V was least sensitive to movement and required longer definitions to detect observed sedentary time (40 min for children and 90 min for adolescents). VM definitions were 10 minutes shorter than V definitions. LFE definitions were 40 minutes shorter than N definitions in adolescents. CONCLUSION: Different nonwear definitions are needed for children and adolescents and for different model-filter-axis types. Authors need to consider nonwear definitions when comparing prevalence rates of sedentary behavior across studies.
PURPOSE: The present study examined various accelerometer nonwear definitions and their impact on detection of sedentary time using different ActiGraph models, filters, and axes. METHODS: In total, 61 youth (34 children and 27 adolescents; aged 5-17 y) wore a 7164 and GT3X+ ActiGraph on a hip-worn belt during a 90-minute structured sedentary activity. Data from GT3X+ were downloaded using the Normal filter (N) and low-frequency extension (LFE), and vertical axis (V) and vector magnitude (VM) counts were examined. Nine nonwear definitions were applied to the 7164 model (V), GT3X+LFE (V and VM), and GT3X+N (V and VM), and sedentary estimates were computed. RESULTS: The GT3X+LFE-VM was most sensitive to movement and could accurately detect observed sedentary time with the shortest nonwear definition of 20 minutes of consecutive "0" counts for children and 40 minutes for adolescents. The GT3X+N-V was least sensitive to movement and required longer definitions to detect observed sedentary time (40 min for children and 90 min for adolescents). VM definitions were 10 minutes shorter than V definitions. LFE definitions were 40 minutes shorter than N definitions in adolescents. CONCLUSION: Different nonwear definitions are needed for children and adolescents and for different model-filter-axis types. Authors need to consider nonwear definitions when comparing prevalence rates of sedentary behavior across studies.
Authors: Delfien Van Dyck; Anthony Barnett; Ester Cerin; Terry L Conway; Irene Esteban-Cornejo; Erica Hinckson; Lukáš Rubín; Elaine Rush; Orna Baron-Epel; Kelli L Cain; Lars Breum Christiansen; Mohammed Zakiul Islam; Josef Mitáš; Javier Molina-García; Adewale Oyeyemi; Harish Ranjani; Rodrigo Reis; Maria Paula Santos; Cindy Sit; Anna Timperio; Wan Abdul Manan Wan Muda; James F Sallis Journal: Int J Behav Nutr Phys Act Date: 2022-07-14 Impact factor: 8.915
Authors: Michael Pratt; James F Sallis; Kelli L Cain; Terry L Conway; Amparo Palacios-Lopez; Alberto Zezza; Chad Spoon; Carrie M Geremia; Isis Gaddis; Akuffo Amankwah; Jed Friedman; Talip Kilic Journal: BMJ Open Sport Exerc Med Date: 2020-10-08
Authors: Alison Carver; Muhammad Akram; Anthony Barnett; Wendy Yajun Huang; Gemma Yang Gao; Robin R Mellecker; Ester Cerin Journal: Int J Behav Nutr Phys Act Date: 2021-01-19 Impact factor: 6.457
Authors: Kelli L Cain; Jo Salmon; Terry L Conway; Ester Cerin; Erica Hinckson; Josef Mitáš; Jasper Schipperijn; Lawrence D Frank; Ranjit Mohan Anjana; Anthony Barnett; Jan Dygrýn; Mohammed Zakiul Islam; Javier Molina-García; Mika Moran; Wan Abdul Manan Wan Muda; Adewale L Oyeyemi; Rodrigo Reis; Maria Paula Santos; Tanja Schmidt; Grant M Schofield; Anna Timperio; Delfien Van Dyck; James F Sallis Journal: BMJ Open Date: 2021-01-18 Impact factor: 2.692