Identification and Validity of Accelerometer Cut-Points for Toddlers

Trost, Stewart G., Loprinzi, Paul D., Fees, Brownyn S., Haar, Sherry J., Murray, Ann D., & Crowe, Linda K. (2012) Identification and Validity of Accelerometer Cut-Points for Toddlers. Obesity, 20(11), pp. 2317-2319.

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The purpose of this study was to derive ActiGraph cut-points for sedentary (SED), light-intensity physical activity (LPA), and moderate-to-vigorous physical activity (MVPA) in toddlers and evaluate their validity in an independent sample. The predictive validity of established preschool cut-points were also evaluated and compared. Twenty-two toddlers (mean age = 2.1 years ± 0.4 years) wore an ActiGraph accelerometer during a videotaped 20-min play period. Videos were subsequently coded for physical activity (PA) intensity using the modified Children's Activity Rating Scale (CARS). Receiver operating characteristic (ROC) curve analyses were conducted to determine cut-points. Predictive validity was assessed in an independent sample of 18 toddlers (mean age = 2.3 ± 0.4 years). From the ROC curve analyses, the 15-s count ranges corresponding to SED, LPA, and MVPA were 0–48, 49–418, and >418 counts/15 s, respectively. Classification accuracy was fair for the SED threshold (ROC-AUC = 0.74, 95% confidence interval = 0.71–0.76) and excellent for MVPA threshold (ROC-AUC = 0.90, 95% confidence interval = 0.88–0.92). In the cross-validation sample, the toddler cut-point and established preschool cut-points significantly overestimated time spent in SED and underestimated time in spent in LPA. For MVPA, mean differences between observed and predicted values for the toddler and Pate cut-points were not significantly different from zero. In summary, the ActiGraph accelerometer can provide useful group-level estimates of MVPA in toddlers. The results support the use of the Pate cut-point of 420 counts/15 s for MVPA.

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39 citations in Web of Science®
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ID Code: 71960
Item Type: Journal Article
Refereed: Yes
Additional Information: ISI Document Delivery No.: 759FO
Times Cited: 0
Cited Reference Count: 0
Loprinzi, Paul D. Fees, Bronwyn S. Haar, Sherry Murray, Ann Crowe, Linda Trost, Stewart G.
57th Annual Meeting of the American-College-Sports-Medicine/Inaugural World Congress on Exercise is Medicine
Jun 05, 2010
Baltimore, MD
Amer Coll Sports Med
Lippincott williams & wilkins
1;<Go to ISI>://WOS:000290226301683
DOI: 10.1038/oby.2011.364
ISSN: 1930-739X
Divisions: Current > QUT Faculties and Divisions > Faculty of Health
Deposited On: 22 May 2014 04:15
Last Modified: 23 May 2014 01:07

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