University of Twente Student Theses
Exploring Stride-Specific Transitioning Functions to Estimate Ground Reaction Forces and Joint Moments Based Solely on Inertial Measurement Units: A Proof of Concept
Kamperman, Lieke (2024) Exploring Stride-Specific Transitioning Functions to Estimate Ground Reaction Forces and Joint Moments Based Solely on Inertial Measurement Units: A Proof of Concept.
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| Abstract: | Gait analysis is pivotal for understanding human locomotion and its implications across various conditions. In this study, a three-dimensional (3D) top-down model for inverse dynamics analysis based solely on Inertial Measurement Units (IMUs) is presented. The research aimed to address the indeterminacy issue in the double-support phase through a stride-specific transitioning function. Three new transitioning functions, utilizing center of mass (CoM) velocity in the horizontal plane, were developed and examined alongside a transitioning function from literature: the Smooth Transitioning Assumption (STA)-based function. These four transitioning functions were evaluated with Pearson correlation and RMSE metrics. The Anterior-Posterior (AP) CoM velocity transitioning function (CoMAP ) was chosen for further analysis. Ground Reaction Forces (GRFs) were estimated using both the CoMAP and the smooth transitioning functions. Validation against force plate measurements and comparison with OpenSim results were conducted, encompassing normal and simulated stiff knee walking conditions. Mean Pearson correlations of 0.91 (AP), 0.68 (Medio-Lateral; ML), and 0.85 (Vertical; vert.) and 0.93 (AP), 0.54 (ML), and 0.86 (Vert.) were observed during normal walking for the CoMAP and STA transitioning functions respectively. For simulated stiff knee walking, correlations were 0.86 (AP), 0.57 (ML), and 0.84 (Vert.) and 0.94 (AP), 0.60 (ML), and 0.92 (Vert.) for the CoMAP and STA transitioning functions respectively. The joint moments derived from the top-down approach exhibit inaccuracies. Nonetheless, this study served as a proof of concept that the CoM velocity can effectively inform the creation of subject and stride-specific transition functions, thereby solving the double support phase indeterminacy problem. |
| Item Type: | Essay (Master) |
| Faculty: | TNW: Science and Technology |
| Programme: | Biomedical Engineering MSc (66226) |
| Link to this item: | https://purl.utwente.nl/essays/98483 |
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