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Validation of activPAL™ Defined Sedentary Time and Breaks in Sedentary Time in 4-6 Year Olds.
|Title||Validation of activPAL™ Defined Sedentary Time and Breaks in Sedentary Time in 4-6 Year Olds.|
|Publication Type||Journal Article|
|Year of Publication||2013|
|Authors||Janssen X, Cliff D, Reilly JJ, Hinkley T, Jones R, Batterham M, Ekelund U, Brage S, Okely T|
|Journal||Pediatric exercise science|
|Date Published||2013 Aug 29|
This study examined the classification accuracy of the activPAL™, including total time spent sedentary and total number of breaks in sedentary behavior (SB) in 4-6 year old children. Forty children aged 4-6 years (5.3±1.0 years) completed a ~150-min laboratory protocol involving sedentary, light and moderate-to vigorous-intensity activities. Posture was coded as sit/lie, stand, walk or 'other' using direct observation. Posture was classified using the activPAL™ software. Classification accuracy was evaluated using sensitivity, specificity and area under the receiver operating characteristic curve (ROC-AUC). Time spent in each posture and total number of breaks in SB were compared using paired sample t-tests. The activPAL™ showed good classification accuracy for sitting (ROC-AUC=0.84) and fair classification accuracy for standing and walking (0.76 and 0.73, respectively). Time spent in sit/lie, and stand was overestimated by 5.9% (95% CI=0.6%-11.1%) and 14.8% (11.6%-17.9%), respectively; walking was underestimated by 10.0% (-12.9%--7.0%). Total number of breaks in SB were significantly overestimated (55±27over the course of the protocol; p<0.01).The activPAL™ performed well when classifying postures in young children. However, the activPAL™ has difficulty classifying 'other' postures, such as kneeling. In addition, when predicting time spent in different postures and total number of breaks in SB the activPAL™ appeared not to be accurate.
|Alternate Journal||Pediatr Exerc Sci|