A Novel and Safe Approach to Simulate Cutting Movements Using Ground Reaction Forces
Amelia S Lanier1,2, Brian A Knarr3,4,5, Nicholas Stergiou6,7
1Biomechanics and Movement Science Program, College of Engineering, University of Delaware, Newark, DE 19716, USA. alanier@unomaha.edu.
Sensors (Basel, Switzerland)
|August 15, 2018
Summary
This study developed a new task to measure how well people control shear ground reaction forces (sGRF), crucial for preventing knee injuries like ACL ruptures. Healthy athletes showed they could accurately control these forces, paving the way for rehabilitation research.
Area of Science:
- Biomechanics
- Motor Control
- Sports Medicine
Background:
- Control of shear ground reaction forces (sGRF) is critical for dynamic movements like running and cutting.
- Impaired sGRF control is linked to knee injuries, including anterior cruciate ligament (ACL) ruptures.
- Existing methods may not adequately assess sGRF control in specific populations.
Purpose of the Study:
- To develop and validate a novel, safe task for evaluating the control and modulation of sGRF during cutting-like movements.
- To assess the accuracy and stability (divergence) of sGRF control in healthy individuals using real-time visual feedback.
- To establish a foundation for using this task in clinical populations for rehabilitation.
Main Methods:
- A force control task was designed using real-time visual feedback of force production.
- Ten healthy recreational athletes performed the task.
- Control was evaluated using accuracy measurements (error) and divergence calculations (Lyapunov Exponent of sGRF trajectories).
Main Results:
- Participants demonstrated accurate control of sGRF across multiple directions, with low error measurements.
- The forces generated during the task were comparable to or exceeded those in functional activities.
- No significant differences in the divergence of force profiles were found, indicating stable force control.
Conclusions:
- The developed task effectively measures accurate and stable sGRF control.
- The task produces functional force magnitudes relevant to athletic movements.
- This novel approach offers a promising tool for assessing and improving sGRF control in rehabilitation for individuals with knee injuries, including ACL deficient and reconstructed patients.
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