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Comparison of epoch and uniaxial versus triaxial accelerometers in the measurement of physical activity in preschool children : a validation study

Hislop, Jane F. and Bulley, Catherine and Mercer, Tom H. and Reilly, John J (2012) Comparison of epoch and uniaxial versus triaxial accelerometers in the measurement of physical activity in preschool children : a validation study. Pediatric Exercise Science, 24 (3). 450 - 460. ISSN 0899-8493

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    Abstract

    The objectives of this Study were to explore whether triaxial is more accurate than uniaxial accelerometry and whether shorter sampling periods (epochs) are more accurate than longer epochs. Physical activity data from uniaxial and triaxial (RT3) devices were collected in 1-s epochs from 31 preschool children (15 males, 16 females, 4.4 +/- 0.8 yrs) who were videoed while they engaged in 1-hr of free-play. Video data were coded using the Children's Activity Rating Scale (CARS). A significant difference (p < .001) in the number of minutes classified as moderate to vigorous physical activity (MVPA) was found between the RT3 and the CARS (p < .002) using the cut point of relaxed walk. No significant difference was found between the GT1M and the CARS or between the RT3 and the CARS using the cut point for light jog. Shorter epochs resulted in significantly greater overestimation of MVPA, with the bias increasing from 0.7 mints at 15-s to 3.2 mins at 60-s epochs for the GT1M and 0 mins to 1.7 mins for the RT3. Results suggest that there was no advantage of a triaxial accelerometer over a uniaxial model. Shorter epochs result in significantly higher number of minutes of MVPA with smaller bias relative to direct observation

    Item type: Article
    ID code: 41907
    Keywords: RT3 accelerometer, activity monitors, calibration, Length, Public health. Hygiene. Preventive Medicine, Pediatrics, Perinatology, and Child Health, Orthopedics and Sports Medicine, Physical Therapy, Sports Therapy and Rehabilitation
    Subjects: Medicine > Public aspects of medicine > Public health. Hygiene. Preventive Medicine
    Department: Faculty of Humanities and Social Sciences (HaSS) > School of Psychological Science and Health > Physical Activity for Health
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    Depositing user: Pure Administrator
    Date Deposited: 03 Nov 2012 15:59
    Last modified: 06 Sep 2014 13:28
    URI: http://strathprints.strath.ac.uk/id/eprint/41907

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