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Extraction of Muscle Synergies in Spinal Cord Injured Patients

Cheng, Richard and Burdick, Joel W. (2018) Extraction of Muscle Synergies in Spinal Cord Injured Patients. In: 2018 40th Annual International Conference of the IEEE Engineering in Medicine and Biology Society (EMBC). IEEE , Piscataway, NJ, pp. 2623-2626. ISBN 978-1-5386-3646-6. https://resolver.caltech.edu/CaltechAUTHORS:20181102-142613215

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Abstract

Muscle synergies encode motor activity as a linear superposition of multiple motor units composed of a temporal command exciting a specific network of muscles. This study examines muscle synergies derived from simple standing studies of a complete spinal cord injury (SCI) patient under epidural spinal stimulation. A popular technique for extracting these synergies from EMG data is non-negative matrix factorization (NNMF). However, standard NNMF algorithms do not allow for physiological delays for a neural signal to reach different muscles. These delays are prevalent in SCI patients under spinal stimulation, and so we propose a new algorithm (regularized ShiftNMF) to extract muscle synergies which account for signal delays. We find muscle synergies extracted by the regularized ShiftNMF algorithm are significantly better at reconstructing EMG activity, and the resulting features are physiologically consistent and more useful in describing patient behavior.


Item Type:Book Section
Related URLs:
URLURL TypeDescription
https://doi.org/10.1109/EMBC.2018.8512763DOIArticle
https://ieeexplore.ieee.org/document/8512763PublisherArticle
Additional Information:© 2018 IEEE. The authors thank Yanan Sui for collecting and sharing the experimental dataset and for many helpful conversations.
Record Number:CaltechAUTHORS:20181102-142613215
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20181102-142613215
Official Citation:R. Cheng and J. W. Burdick, "Extraction of Muscle Synergies in Spinal Cord Injured Patients," 2018 40th Annual International Conference of the IEEE Engineering in Medicine and Biology Society (EMBC), Honolulu, HI, USA, 2018, pp. 2623-2626. doi: 10.1109/EMBC.2018.8512763
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:90619
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:02 Nov 2018 22:05
Last Modified:03 Oct 2019 20:27

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