Machine learning-based gait adaptation dysfunction identification using CMill-based gait data.

BACKGROUND: Combining machine learning (ML) with gait analysis is widely applicable for diagnosing abnormal gait patterns.

OBJECTIVE: To analyze gait adaptability characteristics in stroke patients, develop ML models to identify individuals with GAD, and select optimal diagnostic models and key classification features.

METHODS: This study was investigated with 30 stroke patients (mean age 42.69 years, 60% male) and 50 healthy adults (mean age 41.34 years, 58% male). Gait adaptability was assessed using a CMill treadmill on gait adaptation tasks: target stepping, slalom walking, obstacle avoidance, and speed adaptation. The preliminary analysis of variables in both groups was conducted using t-tests and Pearson correlation. Features were extracted from demographics, gait kinematics, and gait adaptability datasets. ML models based on Support Vector Machine, Decision Tree, Multi-layer Perceptron, K-Nearest Neighbors, and AdaCost algorithm were trained to classify individuals with and without GAD. Model performance was evaluated using accuracy (ACC), sensitivity (SEN), F1-score and the area under the receiver operating characteristic (ROC) curve (AUC).

RESULTS: The stroke group showed a significantly decreased gait speed ( p  = 0.000) and step length (SL) ( p  = 0.000), while the asymmetry of SL ( p  = 0.000) and ST ( p  = 0.000) was higher compared to the healthy group. The gait adaptation tasks significantly decreased in slalom walking ( p  = 0.000), obstacle avoidance ( p  = 0.000), and speed adaptation ( p  = 0.000). Gait speed ( p  = 0.000) and obstacle avoidance ( p  = 0.000) were significantly correlated with global F-A score in stroke patients. The AdaCost demonstrated better classification performance with an ACC of 0.85, SEN of 0.80, F1-score of 0.77, and ROC-AUC of 0.75. Obstacle avoidance and gait speed were identified as critical features in this model.

CONCLUSION: Stroke patients walk slower with shorter SL and more asymmetry of SL and ST. Their gait adaptability was decreased, particularly in obstacle avoidance and speed adaptation. The faster gait speed and better obstacle avoidance were correlated with better functional mobility. The AdaCost identifies individuals with GAD and facilitates clinical decision-making. This advances the future development of user-friendly interfaces and computer-aided diagnosis systems.