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. 2017 Oct 16;7:13300. doi: 10.1038/s41598-017-13369-1

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© The Author(s) 2017

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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Root mean square amplitude of soleus and gastrocnemius surface EMGs. Mean (continuous lines) and standard deviation (dashed lines) are shown for the root mean square (RMS) amplitude of surface EMGs triggered by the firing instants of motor units identified from the gastrocnemius (black lines) and soleus (grey lines) muscles. Amplitude values are shown for all inter-electrode distances considered for two participants, ranging from 0.5 cm to 11.5 cm (left panel) and from 0.5 cm to 13.0 cm (right panel). For clarity, RMS values were normalised with respect to the absolute maximal RMS value across motor units and inter-electrode distances, separately for gastrocnemius and soleus muscles. The vertical dotted line indicates the inter-electrode distance for which the mean RMS amplitude of gastrocnemius triggered EMGs reaches 90% of its maximum.