Article

The aim of this study was to evaluate the interdevice variability in baseline
signal magnitude of the ActivPAL3 (PALTechnologies, Glasgow, UK) activity
monitor. Twenty consecutively numbered ActivPAL3 triaxial physical activity
monitors were assessed for baseline signal magnitudes oriented in the X (vertical
standing), Y (side lying), and Z (lying flat) planes. Data was recorded for 60s
in each orientation and the three orthogonal axes were analysed for baseline
signal magnitude each orientation. Our batch of devices demonstrated
approximately 6.6% difference in raw acceleration calibration values compared to
manufacturer specifications. Analysis of interdevice variability revealed three
devices which exhibited baseline signal variability greater than 1.96 SD of the
group mean. The impact of interdevice variability in baseline signal magnitude on
data collection is unknown, however, supports the argument in the literature for
the systematic checking of interdevice variability as routine maintenance.
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