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dc.creatorKim, Youngdeok
dc.creatorLochbaum, Marc
dc.date.accessioned2021-06-10T16:21:47Z
dc.date.available2021-06-10T16:21:47Z
dc.date.issued2018
dc.identifier.citationKim Y, Lochbaum M. Comparison of Polar Active Watch and Waist- and Wrist-Worn ActiGraph Accelerometers for Measuring Children’s Physical Activity Levels during Unstructured Afterschool Programs. International Journal of Environmental Research and Public Health. 2018; 15(10):2268. https://doi.org/10.3390/ijerph15102268en_US
dc.identifier.urihttps://doi.org/10.3390/ijerph15102268
dc.identifier.urihttps://hdl.handle.net/2346/86982
dc.descriptionErratum published on 3 February 2019, see Int. J. Environ. Res. Public Health 2019, 16(3), 446.en_US
dc.description.abstractBackground: The purpose of this study was to examine the convergent validity of the Polar Active Watch (PAW), a consumer-grade wrist-worn activity monitor, against waist- and wrist-worn research-grade monitors, the ActiGraph GT3X+/GT9X accelerometers, in children. Methods: Fifty-one children (18 boys; mean age = 10.30 ± 0.91 years) wore the three monitors (PAW, GT3X+, and GT9X) during an 80-min afterschool program across five school days. Time spent in sedentary, light-intensity (LPA), and moderate- and vigorous-intensity physical activity (MVPA) were estimated from each monitor. The correlation, mixed model, mean absolute percentage error, equivalence testing, and Bland-Altman analyses were used to examine the comparability of PA estimates of the PAW with GT3X+/GT9X accelerometers. Results: Moderate to strong correlations for sedentary and MVPA minutes, and weak correlation for LPA were observed between the PAW and GT3X+/GT9X accelerometers. Significant mean differences were found, where the PAW tended to overestimate time in sedentary and MVPA and underestimate LPA minutes, compared to the GT3X+/GT9X accelerometers. However, a non-significant mean difference in MVPA minutes was observed when using an adjusted MET threshold (≥4 METs) for the PAW, compared to the GT3X+ accelerometer. Conclusions: The PAW showed moderate convergent validity for sedentary and MVPA minutes against the GT3X+/GT9X accelerometers. However, caution is needed in the direct comparison between the monitors due to relatively large mean differences and within-group variability.en_US
dc.language.isoengen_US
dc.subjectAccelerometeren_US
dc.subjectValidityen_US
dc.subjectYouthen_US
dc.subjectHealthen_US
dc.titleComparison of Polar Active Watch and Waist- and Wrist-Worn ActiGraph Accelerometers for Measuring Children’s Physical Activity Levels during Unstructured Afterschool Programsen_US
dc.typeArticleen_US


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