Disclosure: The accelerometers used were provided by Philips DirectLife, The Netherlands.
Validation of the TracmorD Triaxial Accelerometer to Assess Physical Activity in Preschool Children
Article first published online: 2 JUL 2013
Copyright © 2013 The Obesity Society
Volume 21, Issue 9, pages 1877–1883, September 2013
How to Cite
Sijtsma, A., Schierbeek, H., Goris, A. H.C., Joosten, K. F.M., van Kessel, I., Corpeleijn, E. and Sauer, P. J.J. (2013), Validation of the TracmorD Triaxial Accelerometer to Assess Physical Activity in Preschool Children. Obesity, 21: 1877–1883. doi: 10.1002/oby.20401
Relevant conflicts of interest/financial disclosures: Nothing to report. Full financial disclosures and author notes may be found in the online version of this article.
- Issue published online: 23 SEP 2013
- Article first published online: 2 JUL 2013
- Accepted manuscript online: 20 MAR 2013 02:15AM EST
- Manuscript Accepted: 17 JAN 2013
- Manuscript Received: 14 MAY 2012
Objectives: To assess validity evidence of TracmorD to determine energy used for physical activity in 3-4-year-old children.
Design and Methods: Participants were randomly selected from GECKO Drenthe cohort (n = 30, age 3.4 ± 0.3 years). Total energy expenditure (TEE) was measured using the doubly labeled water method. Sleeping metabolic rate (SMR) was measured by indirect calorimetry (Deltatrac). TEE and SMR were used to calculate physical activity level (PAL) and activity energy expenditure (AEE). Physical activity was monitored using a DirectLife triaxial accelerometer, TracmorD with activity counts per minute (ACM) and activity counts per day (ACD) as outcome measures.
Results: The best predictor for PAL was ACM with gender and weight, the best predictor for AEE was ACM alone (backward regression, R2 = 0.50, P = 0.010 and R2 = 0.31, P = 0.011, respectively). With ACD, the prediction model for PAL included ACD, height, gender, and sleep duration (R2 = 0.48, P = 0.033), the prediction model for AEE included ACD, gender and sleep duration (R2 = 0.39, P = 0.042). The accelerometer was worn for 5 days, but 3 days did not give a different estimated PAL.
Conclusion: TracmorD provides moderate-to-strong validity evidence that supports its use to evaluate energy used for physical activity in 3-4-year-old children.