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Deep ensemble learning approach for lower limb movement recognition from multichannel sEMG signals

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Abstract

Walking is a complex task that requires consistent practice to master, and it involves the synchronisation between the lower limbs and the brain, making it challenging. While bipedal robots have been developed to mimic human walking, they must achieve an efficient gait due to structural differences and walking challenges. This study aims to produce a more human-like walk by analysing human lower extremity activities. To capture the bipedal robot locomotion learning process, an ensemble classifier based on deep learning is introduced to recognise human lower activities. A publicly available UC Irvine Machine Learning Repository (UCI) dataset on surface electromyography (sEMG) signal for the lower extremity of 11 fit participants and 11 participants with knee disorders for sitting while performing knee extension, walking, and standing while performing knee flexion is used. A hybrid ensemble of deep learning models comprising long short-term memory and convolution neural network is employed to classify activities, with reported average accuracies of 98.8%, 98.3%, and 99.3% for healthy subjects for sitting, standing and walking, respectively. Moreover, the ensemble model reported average accuracies of 98.2%, 98.1%, and 99.0% for individuals with knee pathology. Notably, this study holds promising significance, as it has yielded a considerable enhancement in performance as opposed to state-of-the-art work. The applications of this work are diverse and include improving postural stability in elderly subjects, aiding in the rehabilitation of patients recovering from stroke and trauma, generating walking trajectories for robots in complex environments, and reconstructing walking patterns in individuals with impairments.

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Data availability

The dataset analysed during the current study are available in the UCI Machine Learning repository, http://archive.ics.uci.edu/ml/datasets/emg+dataset+in+lower+limb.

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Acknowledgements

This work was supported by the Ministry of Education, Government of India, through the project HEFA CSR under Grant SAN/CSR/08/2021-22. The authors would like to thank the volunteers who have participated and contributed in preparation of the dataset and also the creator of the dataset.

Funding

The work is funded by Ministry of Education, Govt. of India to Dr. Vijay Bhaskar Semwal under Higher Education Financing Agency (HEFA) under CSR Grant with Sanctioned order no- SAN/CSR/08/2021-22.

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P.T and V.B contributed to conceptualisation and methodology; P.T contributed to software; P.T, V.B and S.J contributed to validation and writing–original draft preparation and review and editing; V.B and S.J supervised the study. All authors have read and approved the final manuscript.

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Correspondence to Pratibha Tokas.

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Tokas, P., Semwal, V.B. & Jain, S. Deep ensemble learning approach for lower limb movement recognition from multichannel sEMG signals. Neural Comput & Applic 36, 7373–7388 (2024). https://doi.org/10.1007/s00521-024-09465-9

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