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Inter-Device Agreement between Fitbit Flex 1 and 2 for Assessing Sedentary Behavior and Physical Activity

Author

Listed:
  • Sunku Kwon

    (Department of Health and Kinesiology, University of Utah, Salt Lake City, UT 84112, USA)

  • Ryan D. Burns

    (Department of Health and Kinesiology, University of Utah, Salt Lake City, UT 84112, USA)

  • Youngwon Kim

    (School of Public Health, Li Ka Shing Faculty of Medicine, The University of Hong Kong, Hong Kong
    MRC Epidemiology Unit, School of Clinical Medicine, University of Cambridge, Cambridge CB2 0SL, UK)

  • Yang Bai

    (Department of Health and Kinesiology, University of Utah, Salt Lake City, UT 84112, USA)

  • Wonwoo Byun

    (Department of Health and Kinesiology, University of Utah, Salt Lake City, UT 84112, USA)

Abstract

This study examined the inter-model agreement between the Fitbit Flex (FF) and FF2 in estimating sedentary behavior (SED) and physical activity (PA) during a free-living condition. 33 healthy adults wore the FF and FF2 on non-dominant wrist for 14 consecutive days. After excluding sleep and non-wear time, data from the FF and FF2 was converted to the time spent (min/day) in SED and PA using a proprietary algorithm. Pearson’s correlation was used to evaluate the association between the estimates from FF and FF2. Mean absolute percent errors (MAPE) were used to examine differences and measurement agreement in SED and PA estimates between FF and FF2. Bland-Altman (BA) plots were used to examine systematic bias between two devices. Equivalence testing was conducted to examine the equivalence between the FF and FF2. The FF2 had strong correlations with the FF in estimating SED and PA times. Compared to the FF, the FF2 yielded similar SED and PA estimates along with relatively low measurement discords and did not have significant systematic biases for SED and Moderate-to-vigorous PA estimates. Our findings suggest that researchers may choose FF2 as a measurement of SED and PA when FF is not available in the market during the longitudinal PA research.

Suggested Citation

  • Sunku Kwon & Ryan D. Burns & Youngwon Kim & Yang Bai & Wonwoo Byun, 2021. "Inter-Device Agreement between Fitbit Flex 1 and 2 for Assessing Sedentary Behavior and Physical Activity," IJERPH, MDPI, vol. 18(5), pages 1-11, March.
    • Handle: RePEc:gam:jijerp:v:18:y:2021:i:5:p:2716-:d:512701
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    References listed on IDEAS

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    1. Wonwoo Byun & Jung-Min Lee & Youngwon Kim & Timothy A. Brusseau, 2018. "Classification Accuracy of a Wearable Activity Tracker for Assessing Sedentary Behavior and Physical Activity in 3–5-Year-Old Children," IJERPH, MDPI, vol. 15(4), pages 1-8, March.
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