Non-negative matrix factorisation is the most appropriate method for extraction of muscle synergies in walking and running

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Rabbi, Mohammad Fazle
Pizzolato, Claudio
Lloyd, David G
Carty, Chris P
Devaprakash, Daniel
Diamond, Laura E
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2020
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Abstract

Muscle synergies provide a simple description of a complex motor control mechanism. Synergies are extracted from muscle activation patterns using factorisation methods. Despite the availability of several factorisation methods in the literature, the most appropriate method for muscle synergy extraction is currently unknown. In this study, we compared four muscle synergy extraction methods: non-negative matrix factorisation, principal component analysis, independent component analysis, and factor analysis. Probability distribution of muscle activation patterns were compared with the probability distribution of synergy excitation primitives obtained from the four factorisation methods. Muscle synergies extracted using non-negative matrix factorisation best matched the probability distribution of muscle activation patterns across different walking and running speeds. Non-negative matrix factorisation also best tracked changes in muscle activation patterns compared to the other factorisation methods. Our results suggest that non-negative matrix factorisation is the best factorisation method for identifying muscle synergies in dynamic tasks with different levels of muscle contraction.

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Scientific Reports

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10

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1

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NHMRC

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LP150100905

APP1143660

IC180100024

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© The Author(s) 2020. This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Biomedical engineering

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Rabbi, MF; Pizzolato, C; Lloyd, DG; Carty, CP; Devaprakash, D; Diamond, LE, Non-negative matrix factorisation is the most appropriate method for extraction of muscle synergies in walking and running, Scientific Reports, 2020, 10 (1), pp. 8266:1-8266:11

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