The identification of significant mechanomyography time-domain features for the classification of knee motion

Said Mohamed, Tarek Mohamed Mahmoud and Muhammad Amirul, Abdullah and Alqaraghuli, H. and Musa, Rabiu Muazu and Ahmad Fakhri, Ab Nasir and Mohd Azraai, Mohd Razman and Mohd Yazid, Bajuri and Anwar, P. P. Abdul Majeed (2021) The identification of significant mechanomyography time-domain features for the classification of knee motion. In: Recent Trends in Mechatronics Towards Industry 4.0. Lecture Notes in Electrical Engineering (730). Springer Verlag, Berlin, Germany, 313 -319. ISBN 978-981-33-4596-6

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Abstract

Stroke is the third leading cause of long term disability in the world. More often than not, the patients who suffer from such cerebrovascular disease endure restricted activities of daily living (ADL). Rehabilitation is deemed necessary to improve ones ADL, especially in the early stages of stroke. This study presents the classification of knee motion; particularly extension and flexion, based on muscle signals that could be utilised by an exoskeleton for rehabilitation purpose. A total of 20 subjects participated in the present investigation. The mechanomyography (MMG) signals were collected by accelerometers placed on four of the muscles that control the knee joint, namely, Rectus Femoris, Gracilis, Vastus Medialis, and Biceps Femoris, respectively. Eight statistical features were extracted from the raw data, i.e., root mean square (RMS), variance (VAR), mean, standard deviation (STD), kurtosis, skewness, minimum, and maximum along all x, y and z-axes. The Chi-Square (χ2) feature selection technique was used to identify significant features, in which 30 was identified amongst the 96 extracted features. A 10-fold cross-validation technique was employed in training a Support Vector Machine (SVM) model on a dataset that was partitioned with a ration of 80:20 for train and test, respectively. It was demonstrated in the present investigation that through the reduction of features, the test accuracy increased from 83.3 to 90%, suggesting the importance of the selected features. The findings from the study could pave the way for its adoption on a knee-based exoskeleton for rehabilitation.

Item Type:	Book Chapter
Additional Information:	Indexed by Scopus
Uncontrolled Keywords:	Feature selection; Knee motion; Machine learning; Mechanomyography; Rehabilitation
Subjects:	Q Science > QA Mathematics > QA75 Electronic computers. Computer science T Technology > TJ Mechanical engineering and machinery
Faculty/Division:	Institute of Postgraduate Studies Faculty of Manufacturing and Mechatronic Engineering Technology Faculty of Computing
Depositing User:	Pn. Hazlinda Abd Rahman
Date Deposited:	19 Jul 2024 08:22
Last Modified:	19 Jul 2024 08:22
URI:	http://umpir.ump.edu.my/id/eprint/33345
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