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Predictive validity and classification accuracy of ActiGraph energy expenditure equations and cut-points in young children

Janssen, Xanne, Cliff, Dylan P., Reilly, John J., Hinkley, Trina, Jones, Rachel A., Batterham, Marijka, Ekelund, Ulf, Brage, Soren and Okely, Anthony D. 2013, Predictive validity and classification accuracy of ActiGraph energy expenditure equations and cut-points in young children, PLOS One, vol. 8, no. 11, Article e79124, pp. 1-9.

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Title Predictive validity and classification accuracy of ActiGraph energy expenditure equations and cut-points in young children
Author(s) Janssen, Xanne
Cliff, Dylan P.
Reilly, John J.
Hinkley, Trina
Jones, Rachel A.
Batterham, Marijka
Ekelund, Ulf
Brage, Soren
Okely, Anthony D.
Journal name PLOS One
Volume number 8
Issue number 11
Season Article e79124
Start page 1
End page 9
Total pages 9
Publisher Public Library of Science
Place of publication San Francisco, California
Publication date 2013-11
ISSN 1932-6203
Summary Objectives
Evaluate the predictive validity of ActiGraph energy expenditure equations and the classification accuracy of physical activity intensity cut-points in preschoolers.

Methods
Forty children aged 4–6 years (5.3±1.0 years) completed a ~150-min room calorimeter protocol involving age-appropriate sedentary, light and moderate-to vigorous-intensity physical activities. Children wore an ActiGraph GT3X on the right mid-axillary line of the hip. Energy expenditure measured by room calorimetry and physical activity intensity classified using direct observation were the criterion methods. Energy expenditure was predicted using Pate and Puyau equations. Physical activity intensity was classified using Evenson, Sirard, Van Cauwenberghe, Pate, Puyau, and Reilly, ActiGraph cut-points.

Results
The Pate equation significantly overestimated VO2 during sedentary behaviors, light physical activities and total VO2 (P<0.001). No difference was found between measured and predicted VO2 during moderate-to vigorous-intensity physical activities (P = 0.072). The Puyau equation significantly underestimated activity energy expenditure during moderate-to vigorous-intensity physical activities, light-intensity physical activities and total activity energy expenditure (P<0.0125). However, no overestimation of activity energy expenditure during sedentary behavior was found. The Evenson cut-point demonstrated significantly higher accuracy for classifying sedentary behaviors and light-intensity physical activities than others. Classification accuracy for moderate-to vigorous-intensity physical activities was significantly higher for Pate than others.

Conclusion
Available ActiGraph equations do not provide accurate estimates of energy expenditure across physical activity intensities in preschoolers. Cut-points of ≤25counts⋅15 s−1 and ≥420 counts⋅15 s−1 for classifying sedentary behaviors and moderate-to vigorous-intensity physical activities, respectively, are recommended.
Language eng
Field of Research 110699 Human Movement and Sports Science not elsewhere classified
Socio Economic Objective 920501 Child Health
HERDC Research category C1 Refereed article in a scholarly journal
Copyright notice ©2013, Public Library of Science
Persistent URL http://hdl.handle.net/10536/DRO/DU:30058933

Document type: Journal Article
Collections: School of Exercise and Nutrition Sciences
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Every reasonable effort has been made to ensure that permission has been obtained for items included in DRO. If you believe that your rights have been infringed by this repository, please contact drosupport@deakin.edu.au.