Validity of Accelerometry to Measure Physical Activity Intensity in Children With an Acquired Brain Injury

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Abstract

Purpose:

To evaluate the validity of the ActiGraph accelerometer (AG) to differentiate between standardized, physical activity tasks using oxygen consumption (

Purpose:

JOURNAL/ppyty/04.02/00001577-201710000-00008/math_8MM1/v/2017-12-09T085250Z/r/image-png

Purpose:

O2) as the criterion measure in children and adolescents with an acquired brain injury; to determine vector magnitude activity intensity cut-points; to compare performance of cut-points to previously published cut-points.

Methods:

Twenty-seven children performed standardized walking and stepping activities wearing a portable indirect calorimeter, AG, and heart rate monitor. Differences in

Methods:

JOURNAL/ppyty/04.02/00001577-201710000-00008/math_8MM2/v/2017-12-09T085250Z/r/image-png

Methods:

O2 and AG vector magnitude activity counts were measured during activities. Receiver operating characteristic curves were determined for intensity cut-points.

Results:

JOURNAL/ppyty/04.02/00001577-201710000-00008/math_8MM3/v/2017-12-09T085250Z/r/image-png

Results:

O2 and AG activity counts significantly increased as walking speed increased. Discrimination of the newly derived cut-points was excellent and demonstrated greater agreement compared with the previously published cut-points.

Conclusion:

Output from accelerometers can differentiate physical activity intensity in children with an acquired brain injury. Future studies can apply these cut-points to evaluate physical activity performance.

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