Comparison of children’s free-living physical activity derived from wrist and hip raw accelerations during the segmented week |
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| Authors: | Robert J Noonan Lynne M Boddy Youngwon Kim Zoe R Knowles Stuart J Fairclough |
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| Institution: | 1. Physical Activity Exchange, Research Institute for Sport and Exercise Sciences, Liverpool John Moores University, Liverpool, UK;2. MRC Epidemiology Unit, University of Cambridge School of Clinical Medicine, Cambridge, UK;3. Department of Sport and Physical Activity, Edge Hill University, Ormskirk, UK;4. Department of Physical Education and Sport Sciences, University of Limerick, Limerick, Ireland |
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| Abstract: | This study assessed children’s physical activity (PA) levels derived from wrist-worn GENEActiv and hip-worn ActiGraph GT3X+ accelerometers and examined the comparability of PA levels between the two devices throughout the segmented week. One hundred and twenty-nine 9–10-year-old children (79 girls) wore a GENEActiv (GAwrist) and ActiGraph GT3X+ (AGhip) accelerometer on the left wrist and right hip, respectively, for 7 days. Mean minutes of light PA (LPA) and moderate-to-vigorous PA (MVPA) per weekday (whole-day, before-school, school and after-school) and weekend day (whole-day, morning and afternoon–evening) segments were calculated, and expressed as percentage of segment time. Repeated measures analysis of variance examined differences in LPA and MVPA between GAwrist and AGhip for each time segment. Bland–Altman plots assessed between-device agreement for LPA and MVPA for whole weekday and whole weekend day segments. Correlations between GAwrist and AGhip were weak for LPA (r = 0.18–0.28), but strong for MVPA (r = 0.80–0.86). LPA and MVPA levels during all weekday and weekend day segments were significantly higher for GAwrist than AGhip (p < 0.001). The largest inter-device percent difference of 26% was observed in LPA during the school day segment. Our data suggest that correction factors are needed to improve raw PA level comparability between GAwrist and AGhip. |
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| Keywords: | Physical activity children GENEActiv ActiGraph GT3X+ raw accelerations |
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