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Updated: May 22, 2026
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Substantiating Appropriate Motion Capture Techniques for the Assessment of Nordic Walking Gait and Posture in Older Adults
Published on: May 12, 2016
Evaluating the concurrent validity and test-retest reliability of markerless motion capture for static postural
Sachitha R B A Wijekoon1, Jereme B Outerleys2, Benjamin R Ritsma3
1Centre for Neuroscience Studies, Queen's University, Kingston, Ontario, Canada.
Journal of Biomechanics
|May 20, 2026
Summary
Markerless motion capture offers a valid and reliable method for assessing static postural control. While slightly less reliable when supervised, its accuracy supports clinical use in biomechanical assessments.
Area of Science:
- Biomechanics
- Clinical Biomechanics
- Motion Analysis
Background:
- Markerless motion capture shows promise for clinical biomechanical assessment.
- Its effectiveness for measuring postural control requires further investigation.
Purpose of the Study:
- To assess the concurrent validity and test-retest reliability of markerless motion capture for static postural control.
- To evaluate its robustness under clinically relevant conditions (e.g., simulated supervision).
Main Methods:
- Fifty-three healthy adults performed quiet standing tasks.
- Markerless motion capture (Theia3D) and force plate data were simultaneously collected.
- Concurrent validity was assessed by comparing Center of Mass (COM) and Gravity Line Projection (GLP) signals.
Main Results:
- Strong agreement was found between COM and GLP signals (cross-correlation 0.89-0.99).
- Test-retest reliability was generally higher when standing alone.
- Most parameters showed positive correlations across supervised and unsupervised conditions.
Conclusions:
- Markerless motion capture provides valid and reliable static postural control measures.
- While supervised conditions slightly reduce reliability, the technology is suitable for clinical investigation.
