Validity of accelerometry in ambulatory children and adolescents with cerebral palsy

Clanchy, Kelly M., Tweedy, Sean M., Boyd, Roslyn N. and Trost, Stewart G. (2011) Validity of accelerometry in ambulatory children and adolescents with cerebral palsy. European Journal of Applied Physiology, 111 12: 2951-2959. doi:10.1007/s00421-011-1915-2

Author Clanchy, Kelly M.
Tweedy, Sean M.
Boyd, Roslyn N.
Trost, Stewart G.
Title Validity of accelerometry in ambulatory children and adolescents with cerebral palsy
Journal name European Journal of Applied Physiology   Check publisher's open access policy
ISSN 1439-6319
Publication date 2011-12
Sub-type Article (original research)
DOI 10.1007/s00421-011-1915-2
Volume 111
Issue 12
Start page 2951
End page 2959
Total pages 9
Place of publication Heidelberg, Germany
Publisher Springer
Collection year 2012
Language eng
Formatted 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 (VO2) as the criterion measure. Thirty children and adolescents with CP (mean age 12.6 ± 2.0 years) wore an ActiGraph 7164 and a Cosmed K4b2 portable indirect calorimeter during four activities; quiet sitting, comfortable paced walking, brisk paced walking and fast paced walking. VO2 was converted to METs and activity energy expenditure and classified as sedentary, light or moderate-to-vigorous intensity according to the conventions for children. Mean ActiGraph counts min−1 were classified as sedentary, light or moderate-to-vigorous (MVPA) intensity using four different sets of cut-points. VO2 and counts min−1 increased significantly 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 classification accuracy for sedentary (92%) and MVPA (91%), as well as the second highest classification accuracy for light intensity physical activity (67%). A ROC curve analysis of data from our participants yielded a CP-specific cut-point for MVPA that was lower than the Evenson cut-point (2,012 vs. 2,296 counts min−1), however, the difference in classification accuracy was not statistically significant 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 differentiate between different 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.
Keyword Activity monitors
Cerebral palsy
Physical activity
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Official 2012 Collection
School of Human Movement and Nutrition Sciences Publications
School of Medicine Publications
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Citation counts: TR Web of Science Citation Count  Cited 22 times in Thomson Reuters Web of Science Article | Citations
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Created: Wed, 07 Sep 2011, 15:18:59 EST by Matthew Lamb on behalf of School of Medicine