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. 2020 May 19;10:8266. doi: 10.1038/s41598-020-65257-w

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© The Author(s) 2020

Open Access 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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Reconstruction of muscle activation patterns with three muscle synergies using each factorisation method during walking for one representative participant: (a) muscle synergy weights (W₁-W₃) from 10 included muscles and synergy excitation primitives identified using NMF, PCA, ICA and FA, (b) original muscle activation patterns and reconstructed muscle activation patterns for 10 included muscles. a.u: arbitrary unit.; m₁: biceps femoris; m₂: lateral gastrocnemius; m₃: medial gastrocnemius; m₄: peroneus longus; m₅: peroneus brevis; m₆: rectus femoris: m₇: sartorius; m₈: soleus; m₉: tibialis anterior; m₁₀: vastus lateralis.