Precision and Repeatability of the Motion Analysis Corporation Digital Motion Capture System
Date
2015-04-15
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The University of Toledo
Abstract
Scholarly project completed in partial fulfillment of the requirements for the Occupational Therapy Doctoral Program, The University of Toledo.
Description
The goal of this study was to establish measurement fidelity for the Motion Analysis Corp. digital motion capture system and thereby substantiate the validity of motion capture research in occupational therapy. This was a mixed research design study completed at the motion capture lab at the sponsoring university. Repeatability data were collected in two identical sessions, two weeks apart. There were two sets of conditions in each session: marker sizes and sample rates. Precision data were collected on a different session using the same combinations of conditions. A Motion Analysis Corp. Digital 8-camera motion capture system with Cortex, v. 5.0.1.1497 and C-Motion’s Visual3D data reduction software was used to prepare the data for statistical analysis. SPSS software v 21 was used to statistically analyze the data. The analysis for repeatability involved a repeated measures ANOVA and precision was assessed for each condition utilizing a MANOVA. For both length and angle, no significant differences were found between Trial A and Trial B when testing repeatability. The precision of each dependent variable was affected by specific combination of conditions that were present in the study with mixed results of statistical significance. The results demonstrate that the Motion Analysis Corporation Digital motion capture system is highly precise and repeatable. Future research should investigate other motion capture systems to ascertain measurement fidelity.
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