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. 2020 Mar 19;10:5021. doi: 10.1038/s41598-020-61909-z

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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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Normalized PSD of rectified EMG per muscle and period. PSD’s of rectified EMG are depicted for all muscles during each movement period. Power spectra were averaged across muscles, epochs, and participants and normalized to total power. Each column illustrates different movement periods: ECC (blue), ISO (red) and CON (gray). Each row highlights different muscles, with respective labels next to each row. Muscle names are as follows: M. vastus lateralis (VLr & VLl), M. vastus medialis (VMr & VMl), M. tibialis anterior (TAr & TAl), M. erector spinae (ESr, ESl).