UBC Undergraduate Research

Standing Balance Along The Medial-Lateral Direction Belzner, Paul 2019-03-15

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Paul Belzner Research Advisor: Dr. Jean-Sébastien Blouin 15/3/2019 KIN499 STANDING BALANCE ALONG THE MEDIAL-LATERAL DIRECTION UBC MURC 2019 WHY IS STUDYING STANDING BALANCE IMPORTANT? • Balance control decreases as we age • Injuries through falls • Loss of independence and mobility • Pathological conditions involving the vestibular, visual or somatosensory systems can present themselves in reduced balance control • Understanding how the brain controls movement STANDING BALANCE • Standing balance in the anterior-posterior (forward-backward) direction can be reliably modelled as an inverted pendulum • As we will see, standing balance in the medial-lateral (side to side) direction is not as simple • Research goal: develop a functional model for medial-lateral standing balance AP STANDING BALANCE Inverted Pendulum Model: - The body is represented as a single point mass - A single pivot point at the ankle joint - Relatively simple to implement into a model (Luu et al., 2011, IEEE Neural Sys. And Rehab. Eng.) Image Credit: Khan Academy ML STANDING BALANCE θ4 θ3 θ1 θ2 Problems: - 5 degrees of freedom - 2 hip joints - 2 ankle joints - Motion of torso relative to lower body - Body position changes with different stance width Image Credit: Aoki et al. 2012 ML STANDING BALANCE Our model can be simplified using some important assumptions: - Considering the lower body as a four bar linkage system - Degrees of freedom reduced from four to one - The angular change between the hips and torso can be considered negligible - One parameter controlling the system θ4 θ1 θ3 θ2 Image Credit: Aoki et al. 2012 FUTURE RESEARCH IMPLICATIONS • More dynamically responsive hip prosthetics and exoskeleton modelling • Generally, a better understanding of dynamics of the human body  Image Credit: ReWalk Robotics, NASA ACKNOWLEDGEMENTS Thank you to Dr. Jean-Sébastien Blouin and Dr. Calvin Kuo for their assistance with this research and presentation. Our work has been funded in part by NSERC.  The work on balance is a Discovery grant and the robot is supported by a Research Tool and Instrumentation grant. 

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