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Comparison of Polar Active Watch and Waist- and Wrist-Worn ActiGraph Accelerometers for Measuring Children’s Physical Activity Levels during Unstructured Afterschool Programs

Author

Listed:
  • Youngdeok Kim

    (Department of Kinesiology and Sport Management, Texas Tech University, Lubbock, TX 79409, USA)

  • Marc Lochbaum

    (Department of Kinesiology and Sport Management, Texas Tech University, Lubbock, TX 79409, USA
    The Academy of Education, Vytautas Magnus University, Kaunas LT-44248, Lithuania)

Abstract

Background : 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.

Suggested Citation

  • Youngdeok Kim & Marc Lochbaum, 2018. "Comparison of Polar Active Watch and Waist- and Wrist-Worn ActiGraph Accelerometers for Measuring Children’s Physical Activity Levels during Unstructured Afterschool Programs," IJERPH, MDPI, vol. 15(10), pages 1-17, October.
    • Handle: RePEc:gam:jijerp:v:15:y:2018:i:10:p:2268-:d:175980
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    Cited by:

    1. Marc Lochbaum & Jonathan Kenyon & Youngdeok Kim, 2021. "Physical Activity Levels of 1053 Omani 4th Grade Children: The Importance of Gender and Sport Team Participation in Achieving 60 Minutes of Daily Moderate-to-Vigorous Physical Activity," IJERPH, MDPI, vol. 18(16), pages 1-11, August.

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