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Accelerometer use in young people with Down syndrome: A preliminary cross-validation and reliability study
Peiris, Casey L. Cumming, Toby B. Kramer, Sharon Johnson, Liam Taylor, Nicholas Shields, Nora
Peiris, Casey L.
Cumming, Toby B.
Kramer, Sharon
Johnson, Liam
Taylor, Nicholas
Shields, Nora
Abstract
Background
Inadequate physical activity is a problem for people with Down syndrome and objective monitoring using accelerometers may be inaccurate in this population.
Method
This was a cross-validation and reliability study comparing two triaxial accelerometers (the SenseWear and RT3) to a criterion measure (the OxyCon Mobile) in 10 young people (M age = 20 ± 2) with Down syndrome. A ROC curve analysis was conducted to determine intensity thresholds from RT3 activity counts.
Results
During self-selected pace walking, the accelerometers overestimated energy expenditure and had large limits of agreement (SenseWear: −0.5–3.6 METs; RT3: −0.2–2.7 METs). At this pace, SenseWear armband step counts were highly correlated with observed steps (r = .98) but underestimated steps by up to 12%. We developed RT3 thresholds that demonstrated good to excellent sensitivity and specificity in classifying physical activity intensity.
Conclusions
SenseWear steps and RT3 activity count thresholds can be used to monitor physical activity in young people with Down syndrome, although energy expenditure estimates should be used with caution in this population.
Keywords
Down syndrome, accelerometry, motor activity, trisomy 21, intellectual disability
Date
2016
Type
Journal article
Journal
Journal of Intellectual and Developmental Disability
Book
Volume
42
Issue
4
Page Range
339-350
Article Number
ACU Department
School of Behavioural and Health Sciences
Faculty of Health Sciences
Faculty of Health Sciences
Relation URI
Source URL
Event URL
Open Access Status
License
All rights reserved
File Access
Controlled