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Published on: February 28, 2025
Differences between lower extremity joint running kinetics captured by marker-based and markerless systems were speed
Hui Tang1, Barry Munkasy2, Li Li2
1Department of Health Sciences and Kinesiology, Georgia Southern University, Statesboro, GA 30458, USA; Department of Kinesiology and Health Education, University of Texas at Austin, Austin, TX 78712, USA.
Markerless motion tracking overestimates lower extremity joint moments and powers during running, especially at faster speeds. This systematic difference requires attention for accurate biomechanical analysis in sports and clinical settings.
Area of Science:
- Biomechanics
- Motion Analysis
- Computer Vision
Background:
- Markerless motion tracking offers potential for biomechanical analysis.
- Its utility for high-speed movements like running requires further investigation.
- Applied studies in clinical and sports settings are limited.
Purpose of the Study:
- To compare running biomechanics between marker-based and markerless systems.
- To investigate the effect of running speed on lower extremity joint moment and power estimation differences.
- To validate markerless technology for treadmill running analysis.
Main Methods:
- Collected kinematic and ground reaction force data from 16 adults running at three speeds (2.24, 2.91, 3.58 m/s).
- Calculated sagittal plane hip, knee, and ankle moments and powers using inverse dynamics.
- Employed time series analysis and statistical parametric mapping to compare marker-based and markerless systems.
Main Results:
- The markerless system generally overestimated lower extremity joint kinetics compared to the marker-based system.
- These overestimations were more pronounced during the swing phase and at faster running speeds.
Conclusions:
- Markerless technology shows promise but exhibits systematic overestimation of joint moments and powers.
- Discrepancies arise from markerless systems estimating centers of mass farther from joint centers.
- Running speed amplifies the differences between markerless and marker-based biomechanical estimations.
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