Accuracy and Precision of the PEAK Performance Technologies Motion Measurement System

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Abstract
This study evaluated the accuracy and precision of the PEAK Performance Technologies, Inc.'s motion analysis system for three-dimensional angle reconstruction. Pendular motion of a bar, on which 18 retroreflective markers were mounted, was videotaped at three different orientations (parallel, and rotated 30° right and left) to a plane at which two standard video cameras were aimed. The videotaped motion was digitized off-line, and 32 angles between the 18 markers were calculated. Intraclass correlation coefficients (ICCs) were calculated between trials within each pendulum orientation and across orientations to determine system precision, and between randomly selected trials and actual angles to determine accuracy. ICCs were in all cases greater than .99. Within-trial standard deviations ranged between 0.05–0.8° for the different angles. Deviations from the actual angle averaged 0.0–0.8° across all angles and orientations. The results indicate that accurate and reliable angular measurements can be made with this motion analysis system.

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