Advanced search
1 file | 107.58 KB

Calibration and comparison of accelerometer cut points in preschool children

Author
Organization
Project
FWO B/10525/01
Abstract
Objective. The present study aimed to develop accelerometer cut points to classify physical activities (PA) by intensity in preschoolers and to investigate discrepancies in PA levels when applying various accelerometer cut points. Methods. To calibrate the accelerometer, 18 preschoolers (5.8 +/- 0.4 years) performed eleven structured activities and one free play session while wearing a GT1M ActiGraph accelerometer using 15 s epochs. The structured activities were chosen based on the direct observation system Children's Activity Rating Scale (CARS) while the criterion measure of PA intensity during free play was provided using a second-by-second observation protocol (modified CARS). Receiver Operating Characteristic (ROC) curve analyses were used to determine the accelerometer cut points. To examine the classification differences, accelerometer data of four consecutive days from 114 preschoolers (5.5 +/- 0.3 years) were classified by intensity according to previously published and the newly developed accelerometer cut points. Differences in predicted PA levels were evaluated using repeated measures ANOVA and Chi Square test. Results. Cut points were identified at 373 counts/15 s for light (sensitivity: 86%; specificity: 91%; Area under ROC curve: 0.95), 585 counts/15 s for moderate (87%; 82%; 0.91) and 881 counts/15 s for vigorous PA (88%; 91%; 0.94). Further, applying various accelerometer cut points to the same data resulted in statistically and biologically significant differences in PA. Conclusions. Accelerometer cut points were developed with good discriminatory power for differentiating between PA levels in preschoolers and the choice of accelerometer cut points can result in large discrepancies.
Keywords
ROC curve, bias (epidemiology), calibration, preschool, child, motor activity, Weights and measures, OBESITY, CHILDHOOD, VALIDATION, PREVALENCE, OVERWEIGHT, PHYSICAL-ACTIVITY, SEDENTARY BEHAVIOR

Downloads

  • (...).pdf
    • full text
    • |
    • UGent only
    • |
    • PDF
    • |
    • 107.58 KB

Citation

Please use this url to cite or link to this publication:

Chicago
Van Cauwenberghe, Eveline, Valery Labarque, Sterwart G Trost, Ilse De Bourdeaudhuij, and Greet Cardon. 2011. “Calibration and Comparison of Accelerometer Cut Points in Preschool Children.” International Journal of Pediatric Obesity 6 (2-2): E582–E589.
APA
Van Cauwenberghe, Eveline, Labarque, V., Trost, S. G., De Bourdeaudhuij, I., & Cardon, G. (2011). Calibration and comparison of accelerometer cut points in preschool children. INTERNATIONAL JOURNAL OF PEDIATRIC OBESITY, 6(2-2), E582–E589.
Vancouver
1.
Van Cauwenberghe E, Labarque V, Trost SG, De Bourdeaudhuij I, Cardon G. Calibration and comparison of accelerometer cut points in preschool children. INTERNATIONAL JOURNAL OF PEDIATRIC OBESITY. 2011;6(2-2):E582–E589.
MLA
Van Cauwenberghe, Eveline, Valery Labarque, Sterwart G Trost, et al. “Calibration and Comparison of Accelerometer Cut Points in Preschool Children.” INTERNATIONAL JOURNAL OF PEDIATRIC OBESITY 6.2-2 (2011): E582–E589. Print.
@article{1229059,
  abstract     = {Objective. The present study aimed to develop accelerometer cut points to classify physical activities (PA) by intensity in preschoolers and to investigate discrepancies in PA levels when applying various accelerometer cut points. Methods. To calibrate the accelerometer, 18 preschoolers (5.8 +/- 0.4 years) performed eleven structured activities and one free play session while wearing a GT1M ActiGraph accelerometer using 15 s epochs. The structured activities were chosen based on the direct observation system Children's Activity Rating Scale (CARS) while the criterion measure of PA intensity during free play was provided using a second-by-second observation protocol (modified CARS). Receiver Operating Characteristic (ROC) curve analyses were used to determine the accelerometer cut points. To examine the classification differences, accelerometer data of four consecutive days from 114 preschoolers (5.5 +/- 0.3 years) were classified by intensity according to previously published and the newly developed accelerometer cut points. Differences in predicted PA levels were evaluated using repeated measures ANOVA and Chi Square test. Results. Cut points were identified at 373 counts/15 s for light (sensitivity: 86%; specificity: 91%; Area under ROC curve: 0.95), 585 counts/15 s for moderate (87%; 82%; 0.91) and 881 counts/15 s for vigorous PA (88%; 91%; 0.94). Further, applying various accelerometer cut points to the same data resulted in statistically and biologically significant differences in PA. Conclusions. Accelerometer cut points were developed with good discriminatory power for differentiating between PA levels in preschoolers and the choice of accelerometer cut points can result in large discrepancies.},
  author       = {Van Cauwenberghe, Eveline and Labarque, Valery and Trost, Sterwart G and De Bourdeaudhuij, Ilse and Cardon, Greet},
  issn         = {1747-7166},
  journal      = {INTERNATIONAL JOURNAL OF PEDIATRIC OBESITY},
  keywords     = {ROC curve,bias (epidemiology),calibration,preschool,child,motor activity,Weights and measures,OBESITY,CHILDHOOD,VALIDATION,PREVALENCE,OVERWEIGHT,PHYSICAL-ACTIVITY,SEDENTARY BEHAVIOR},
  language     = {eng},
  number       = {2-2},
  pages        = {E582--E589},
  title        = {Calibration and comparison of accelerometer cut points in preschool children},
  url          = {http://dx.doi.org/10.3109/17477166.2010.526223},
  volume       = {6},
  year         = {2011},
}

Altmetric
View in Altmetric
Web of Science
Times cited: