People walk on different terrains daily, for instance, level-ground walking, ramp and stair ascent and descent, and stepping over obstacles are common activities in daily life. Movementspatterns change as people move from one terrain to another. Prediction of transitions between locomotion modes is important for developing assistive devices such as exoskeletons, as optimal assistive strategies may differ for different locomotion modes. Prediction of locomotion mode transitions is often accompanied by gait event detection that provides important information during locomotion about critical events, such as foot contact (FC) and toe off (TO). In this study, we introduce a method to integrate locomotion mode prediction and gait event identification into one machine learning framework, comprised of two multilayer perceptrons (MLP). Input features to the framework were from fused data from wearable sensors, specifically, electromyography sensors and inertial measurement units. The first MLP successfully identified FC and TO; FC events were identified accurately, and a small number of misclassifications only occurred near TO events. A small time difference (2.5 ms and -5.3 ms for FC and TO respectively) was found between predicted and true gait events. The second MLP correctly identified walking, ramp ascent, and ramp descent transitions with the best aggregate accuracy of 96.3%, 90.1%, and 90.6%, respectively, with sufficient prediction time prior to the critical events. The models in this study demonstrate high accuracy in predicting transitions between different locomotion modes in the same side’s mid-to late stance of the stride prior to the step into the new model using data from EMG and IMUs sensors. Our results may help assistive devices achieve smooth and seamless transitions in different locomotion modes for the person with motor disorders. ; QC 20211110


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    Titel :

    Locomotion mode transition prediction based on gait event identification using wearable sensors and multilayer perceptrons


    Beteiligte:
    Su, Binbin (Autor:in) / Liu, Yixing (Autor:in) / Gutierrez-Farewik, Elena (Autor:in)

    Medientyp :

    Paper


    Format :

    Elektronische Ressource


    Sprache :

    Englisch



    Klassifikation :

    DDC:    629



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