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    Validity of accelerometry in ambulatory children and adolescents with cerebral palsy

    Access Status
    Fulltext not available
    Authors
    Clanchy, K.
    Tweedy, S.
    Boyd, Roslyn
    Trost, S.
    Date
    2011
    Type
    Journal Article
    
    Metadata
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    Citation
    Clanchy, K. and Tweedy, S. and Boyd, R. and Trost, S. 2011. Validity of accelerometry in ambulatory children and adolescents with cerebral palsy. European Journal of Applied Physiology. 111 (12): pp. 2951-2959.
    Source Title
    European Journal of Applied Physiology
    DOI
    10.1007/s00421-011-1915-2
    ISSN
    1439-6319
    School
    School of Occupational Therapy and Social Work
    URI
    http://hdl.handle.net/20.500.11937/24836
    Collection
    • Curtin Research Publications
    Abstract

    To evaluate the validity of the ActiGraph accelerometer for the measurement of physical activity intensity in children and adolescents with cerebral palsy (CP) using oxygen uptake (VO 2) as the criterion measure. Thirty children and adolescents with CP (mean age 12.6 ± 2.0 years) wore an ActiGraph 7164 and a Cosmed K4b 2 portable indirect calorimeter during four activities; quiet sitting, comfortable paced walking, brisk paced walking and fast paced walking. VO 2 was converted to METs and activity energy expenditure and classiWed as sedentary, light or moderate-to-vigorous intensity according to the conventions for children. Mean ActiGraph counts min -1 were classiWed as sedentary, light or moderate-to-vigorous (MVPA) intensity using four diVerent sets of cut-points. VO 2 and counts min¡1 increased signiWcantly with increases in walking speed (P < 0.001). Receiver operating characteristic (ROC) curve analysis indicated that, of the four sets of cut-points evaluated, the Evenson et al. (J Sports Sci 26(14):1557-1565, 2008) cut-points had the highest classiWcation accuracy for sedentary (92%) and MVPA (91%), as well as the second highest classiWcation accuracy for light intensity physical activity (67%). A ROC curve analysis of data from our participants yielded a CP-speciWc cut-point for MVPA that was lower than the Evenson cut-point (2,012 vs. 2,296 counts min¡1), however, the diVerence in classiWcation accuracy was not statistically signiWcant 94% (95% CI = 88.2-97.7%) vs. 91% (95% CI = 83.5-96.5%). In conclusion, among children and adolescents with CP, the ActiGraph is able to diVerentiate between diVerent intensities of walking. The use of the Evenson cut-points will permit the estimation of time spent in MVPA and allows comparisons to be made between activity measured in typically developing adolescents and adolescents with CP. © 2011 Springer-Verlag.

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