Abstract
Objectives
The purpose of the study was to establish activity intensity cut-points for the GENEA
accelerometer via calibration with oxygen consumption ().
Design
The study was a lab-based validation and calibration study.
Methods
Forty-four children, aged 8–14 years, completed eight activities (ranging from lying
supine to a medium paced run) whilst wearing GENEA accelerometers at three locations
(each wrist and at the right hip), an ActiGraph GT1M at the hip and a portable gas
analyser. ActiGraph output and were used for assessment of concurrent and criterion validity, respectively. Pearson's
r correlations were used to assess validity of the GENEA monitors at each location
and location-specific activity intensity cut-points were established via Receiver
Operator Characteristic curve analysis.
Results
The GENEA showed good criterion validity at both wrist locations (right: r = .900; left: r = .910, both p < 0.01), although the hip-mounted monitor demonstrated significantly higher criterion
validity (r = .965, p < 0.05). Similar results were shown for concurrent validity (right: r = .830; left: r = .845; hip: r = .985, all p < 0.01). GENEAs, irrespective of wear location, accurately discriminated between all
activity intensities (sedentary, light, moderate and vigorous) with the hip mounted
monitor recording the largest area under the curve for each intensity (area under
the curve = 0.94–0.99).
Conclusions
The GENEA can be used to accurately assess children's physical activity intensity
when worn at either the wrist or the hip.
Keywords
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Article info
Publication history
Published online: July 09, 2012
Accepted:
May 30,
2012
Received in revised form:
March 1,
2012
Received:
September 27,
2011
Identification
Copyright
© 2012 Sports Medicine Australia. Published by Elsevier Inc. All rights reserved.
