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Open AccessArticle

Classification Accuracy of a Wearable Activity Tracker for Assessing Sedentary Behavior and Physical Activity in 3–5-Year-Old Children

1
Department of Health, Kinesiology, and Recreation, University of Utah, Salt Lake City, UT 84112, USA
2
School of Physical Education, Kyung Hee University, Yongin 17104, Korea
3
Medical Research Council Epidemiology Unit, University of Cambridge School of Clinical Medicine, Cambridge CBD 0SP, UK
*
Author to whom correspondence should be addressed.
Int. J. Environ. Res. Public Health 2018, 15(4), 594; https://doi.org/10.3390/ijerph15040594
Received: 21 February 2018 / Revised: 19 March 2018 / Accepted: 23 March 2018 / Published: 26 March 2018
(This article belongs to the Special Issue Eating and Exercise in Children and Adolescents)
This study examined the accuracy of the Fitbit activity tracker (FF) for quantifying sedentary behavior (SB) and varying intensities of physical activity (PA) in 3–5-year-old children. Twenty-eight healthy preschool-aged children (Girls: 46%, Mean age: 4.8 ± 1.0 years) wore the FF and were directly observed while performing a set of various unstructured and structured free-living activities from sedentary to vigorous intensity. The classification accuracy of the FF for measuring SB, light PA (LPA), moderate-to-vigorous PA (MVPA), and total PA (TPA) was examined calculating Pearson correlation coefficients (r), mean absolute percent error (MAPE), Cohen’s kappa (k), sensitivity (Se), specificity (Sp), and area under the receiver operating curve (ROC-AUC). The classification accuracies of the FF (ROC-AUC) were 0.92, 0.63, 0.77 and 0.92 for SB, LPA, MVPA and TPA, respectively. Similarly, values of kappa, Se, Sp and percentage of correct classification were consistently high for SB and TPA, but low for LPA and MVPA. The FF demonstrated excellent classification accuracy for assessing SB and TPA, but lower accuracy for classifying LPA and MVPA. Our findings suggest that the FF should be considered as a valid instrument for assessing time spent sedentary and overall physical activity in preschool-aged children. View Full-Text
Keywords: accelerometer; sedentary behavior; physical activity; preschool; children; obesity accelerometer; sedentary behavior; physical activity; preschool; children; obesity
MDPI and ACS Style

Byun, W.; Lee, J.-M.; Kim, Y.; Brusseau, T.A. Classification Accuracy of a Wearable Activity Tracker for Assessing Sedentary Behavior and Physical Activity in 3–5-Year-Old Children. Int. J. Environ. Res. Public Health 2018, 15, 594.

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