Validating Fitbit Zip for monitoring physical activity of children in school: a cross-sectional study

BMC Public Health
Kerli MoosesMerike Kull

Abstract

Modern activity trackers, including the Fitbit Zip, enable the measurement of both the step count as well as physical activity (PA) intensities. However, there is a need for field-based validation studies in a variety of populations before using trackers for research. Therefore, the purpose of the current study was to investigate the validity of Fitbit Zip step count, moderate to vigorous physical activity (MVPA) and sedentary minutes, in different school segments in 3rd grade students. Third grade students (N = 147, aged 9-10 years) wore a Fitbit Zip and an ActiGraph GT3x-BT accelerometer simultaneously on a belt for five days during school hours. The number of steps, minutes of MVPA and sedentary time during class time, physical education lessons and recess were extracted from both devices using time filters, based on the information from school time tables obtained from class teachers. The validity of the Fitbit Zip in different school segments was assessed using Bland-Altman analysis and Spearman's correlation. There was a strong correlation in the number of steps in all in-school segments between the two devices (r = 0.85-0.96, P < 0.001). The Fitbit Zip overestimated the number of steps in all segments, with the greatest ...Continue Reading

References

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Citations

Jan 5, 2021·European Journal of Pediatrics·Philip LambrechtseJohannes N van den Anker
Apr 4, 2021·International Journal of Environmental Research and Public Health·Ryan Donald BurnsWonwoo Byun
Nov 19, 2021·Nursing Open·Sun-Mi ChaeHee Sun Kang

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Software Mentioned

SQL
Fitbit Zip
ActiGraph
Fitbit
ActiLife
Qure Data Management Platform

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