University of Twente Student Theses
Decoding Motor Unit Firing Events During Walking : An Adaptive Approach Validated with Intramuscular Electromyography
Dieren, B.J. van (2025) Decoding Motor Unit Firing Events During Walking : An Adaptive Approach Validated with Intramuscular Electromyography.
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| Abstract: | Motor unit decomposition from high-density sur- face electromyography (HD-EMG) provides insights into neural control of movement. However, variations in motor unit action potential (MUAP) shape during dynamic conditions, such as walking, pose challenges for decomposition accuracy. This thesis presents an adaptive framework to address these challenges, focusing on the m. soleus in walking. The framework consists of: (1) an offline procedure to extract decomposition parameters from low-force isometric and walking trials, (2) an online-ready system applying these parameters in static and adaptive algorithms to estimate MU-specific activation dynamics, and (3) validation against intramuscular EMG (iEMG) benchmarks. Results showed that static decomposition performed well at lower speeds ( 0.6 m/s), while the adaptive algorithm improved robustness in dynamic conditions for processing windows ≥ 200 ms. When training and test datasets were from different trials, the adaptive method significantly outperformed the static approach. This adaptive approach enables real-time tracking of m. soleus motor unit activity, with applications in movement analysis, rehabilitation and human-machine interfacing. Future research should optimize muscle parameters with greater MUAP variability and validate the method in impaired populations. Integrating adaptive decomposition with neuromusculoskeletal models could enhance joint torque estimation and real-time control of wearable robotics |
| Item Type: | Essay (Master) |
| Faculty: | EEMCS: Electrical Engineering, Mathematics and Computer Science |
| Subject: | 50 technical science in general, 53 electrotechnology |
| Programme: | Biomedical Engineering MSc (66226) |
| Link to this item: | https://purl.utwente.nl/essays/106028 |
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