Sensor-Based Classification of Post-Stroke Motor Impairment Using Fugl-Meyer Lower Extremity Scores

This study aims to evaluate multiple feature sets composed of sensor-based biomarkers acquired during walking for the automated estimation of post-stroke motor impairment levels using Fugl-Meyer Lower Extremity Assessment (FMA-LE) derived classes. Sensor-based walking data from the open-source ARRA dataset were combined with data collected at the Hospital of Braga. Data from 32 post-stroke individuals (FMA-LE:24±3) were included. A decision tree classifier was evaluated using stratified 6-fold cross-validation across different feature configurations, including: correlated versus full feature sets; spatiotemporal versus electromyographic (EMG) features; inclusion of demographic variables; and the use of data augmentation. The best performance was achieved using correlated EMG features combined with age, paretic side, and body mass, along with noise-based data augmentation, yielding a validation MCC of 0.85±0.16 and a test MCC of 0.70. EMG features provided improved classification performance compared to spatiotemporal features, and comparable results were obtained using a reduced subset of muscles. These results demonstrate the feasibility of using EMG-based features acquired during walking to classify post-stroke motor impairment levels. Feature reduction and inclusion of demographic variables may support efficient model design, while data augmentation may enhance generalization. Further validation in larger and more diverse datasets is required to assess robustness and clinical applicability.