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Introduction: Motion sensors are mechanical andelectronic devices, which detect the body movement and provide an estimate ofphysical activity in children and adults. However, they need to be validatedagainst criterion methods such as direct observation. The purpose of this studywas to validate a wrist worn accelerometer to quantify the physical activity ofchildren, by comparison to direct observation using the Children’s ActivityRating Scale CARS. Materials and Methods: Data were recorded from 42children, aged 3 - 5 years 22 boys and 20 girls, of whom each was observedeach minute for 2 hours using Children’s Activity Rating Scale CARS whilethey wore the Actiwatch. Results: The CARS score and activity counts from theaccelerometer were averaged over 1- to 10-minute periods across all individuals.There was a significant positive correlation between the mean CARS scores andthe mean Actiwatch counts over simultaneous 1- to 10-minute periods rangingfrom r = 0.41 to r = 0.63 P < 0.001. To assess validity of the data, across validation method was applied. There was no significant difference between the predicted and the observed CARS scores inthe validation sample. Given the data from the Actiwatch averaged over a5-minute epoch, the equivalent CARS score could be calculated with a 95% confidencelevel of plus or minus 0.74 CARS units. Conclusion: These data suggest that theActiwatch a wrist worn accelerometer is a valid tool for assessing levels ofphysical activity in young children.

KEYWORDS

Accelerometer; Physical Activity; Children; Observation

Cite this paper

Djafarian, K. , Speakman, J. , Stewart, J. and Jackson, D. 2013 Comparison of activity levels measured by a wrist worn accelerometer and direct observation in young children. Open Journal of Pediatrics, 3, 422-427. doi: 10.4236-ojped.2013.34076.





Autor: Kurosh Djafarian, John R. Speakman, Joanne Stewart, Diane M. Jackson

Fuente: http://www.scirp.org/



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