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. 2024 Oct 22;14:24918. doi: 10.1038/s41598-024-75145-2

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© The Author(s) 2024

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 licence, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons licence 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 licence, visit http://creativecommons.org/licenses/by/4.0/.

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Fig. 4 — Comparison of extra force (A) and sustained electromyographic (EMG) activity (B) between muscle groups (PF: plantar flexors; KE: knee extensors; EF: elbow flexors) at each stimulation frequency. Individual and mean data (red) are displayed. For extra force, positive values representing responders are in black while negative values corresponding to non-responders are in grey. EMG activity was measured on soleus for plantar flexors, vastus lateralis for knee extensors and biceps brachii for elbow flexors. *p < 0.05, **p < 0.01, ***p < 0.001.