Validation of accelerometer cut points in toddlers with and without cerebral palsy

Oftedal, S., Bell, K.L., Davies, P.S.W., Ware, R.S. and Boyd, R.N. (2014) Validation of accelerometer cut points in toddlers with and without cerebral palsy. Medicine and Science in Sports and Exercise, 46 9: 1808-1815. doi:10.1249/MSS.0000000000000299


Author Oftedal, S.
Bell, K.L.
Davies, P.S.W.
Ware, R.S.
Boyd, R.N.
Title Validation of accelerometer cut points in toddlers with and without cerebral palsy
Journal name Medicine and Science in Sports and Exercise   Check publisher's open access policy
ISSN 1530-0315
0195-9131
Publication date 2014-09
Sub-type Article (original research)
DOI 10.1249/MSS.0000000000000299
Open Access Status
Volume 46
Issue 9
Start page 1808
End page 1815
Total pages 8
Place of publication Philadelphia, PA, U.S.A.
Publisher Lippincott Williams and Wilkins
Collection year 2015
Language eng
Subject 2732 Orthopedics and Sports Medicine
3612 Physical Therapy, Sports Therapy and Rehabilitation
Abstract AIM: The purpose of this study was to validate uni-and triaxial ActiGraph cut points for sedentary time in toddlers with cerebral palsy (CP) and typically developing children (TDC). METHODS: Children (n = 103, 61 boys, mean age = 2 yr, SD = 6 months, range = 1 yr 6 months-3 yr) were divided into calibration (n = 65) and validation (n = 38) samples with separate analyses for TDC (n = 28) and ambulant (Gross Motor Function Classification System I-III, n = 51) and nonambulant (Gross Motor Function Classification System IV-V, n = 25) children with CP. An ActiGraph was worn during a videotaped assessment. Behavior was coded as sedentary or nonsedentary. Receiver operating characteristic-area under the curve analysis determined the classification accuracy of accelerometer data. Predictive validity was determined using the Bland-Altman analysis. RESULTS: Classification accuracy for uniaxial data was fair for the ambulatory CP and TDC group but poor for the nonambulatory CP group. Triaxial data showed good classification accuracy for all groups. The uniaxial ambulatory CP and TDC cut points significantly overestimated sedentary time (bias =-10.5%, 95% limits of agreement [LoA] =-30.2% to 9.1%; bias =-17.3%, 95% LoA =-44.3% to 8.3%). The triaxial ambulatory and nonambulatory CP and TDC cut points provided accurate group-level measures of sedentary time (bias =-1.5%, 95% LoA =-20% to 16.8%; bias = 2.1%, 95% LoA =-17.3% to 21.5%; bias =-5.1%, 95% LoA =-27.5% to 16.1%). CONCLUSION: Triaxial accelerometers provide useful group-level measures of sedentary time in children with CP across the spectrum of functional abilities and TDC. Uniaxial cut points are not recommended.
Keyword Disability
Motor Impairment
Physical Activity
Sedentary Behavior
Young Children
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

 
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