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Article
Evaluation of Actical equations and thresholds to predict physical activity intensity in young children
Faculty of Social Sciences - Papers
  • Xanne Janssen, University of Wollongong
  • Dylan P Cliff, University of Wollongong
  • John J Reilly, University of Strathclyde
  • Trina Hinkley, Deakin University
  • Rachel A Jones, University of Wollongong
  • Marijka Batterham, University of Wollongong
  • Ulf Ekelund, Norwegian School of Sport Sciences
  • Soren Brage, Addenbrooke's Hospital
  • Anthony D Okely, University of Wollongong
RIS ID
98255
Publication Date
1-1-2015
Publication Details

Janssen, X., Cliff, D., Reilly, J., Hinkley, T., Jones, R., Batterham, M., Ekelund, U., Brage, S. & Okely, T. (2015). Evaluation of Actical equations and thresholds to predict physical activity intensity in young children. Journal of Sports Sciences, 33 (5), 498-506.

Abstract
This study examined the validity of current Actical activity energy expenditure (AEE) equations and intensity cut-points in preschoolers using AEE and direct observation as criterion measures. Forty 4–6-year-olds (5.3 ± 1.0 years) completed a ~150-min room calorimeter protocol involving age-appropriate sedentary behaviours (SBs), light intensity physical activities (LPAs) and moderate-to-vigorous intensity physical activities (MVPAs). AEE and/or physical activity intensity were calculated using Actical equations and cut-points by Adolph, Evenson, Pfeiffer and Puyau. Predictive validity was examined using paired sample t-tests. Classification accuracy was evaluated using weighted kappas, sensitivity, specificity and area under the receiver operating characteristic curve. The Pfeiffer equation significantly overestimated AEE during SB and underestimated AEE during LPA (P < 0.0125 for both). There was no significant difference between measured and predicted AEEs during MVPA. The Adolph cut-point showed significantly higher accuracy for classifying SB, LPA and MVPA than all others. The available Actical equation does not provide accurate estimates of AEE across all intensities in preschoolers. However, the Pfeiffer equation performed reasonably well for MVPA. Using cut-points of ≤6 counts · 15 s−1, 7–286 counts · 15 s−1 and ≥ 287 counts · 15 s−1 when classifying SB, LPA and MVPA, respectively, is recommended.
Citation Information
Xanne Janssen, Dylan P Cliff, John J Reilly, Trina Hinkley, et al.. "Evaluation of Actical equations and thresholds to predict physical activity intensity in young children" (2015)
Available at: http://works.bepress.com/mbatterham/128/