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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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Assessing the surface representation of gastrocnemius motor units. Raw surface potentials and their Root Mean Square (RMS) amplitude are shown in panels A and B respectively. Surface potentials were obtained by triggering and averaging surface EMGs with the firing instants of a motor unit obtained by decomposing the intramuscular EMG detected from the gastrocnemius muscle of a representative participant. Surface potentials and RMS values are shown for bipolar electrodes centred at all possible skin locations, separately for inter-electrode distances ranging from 0.5 to 6.0 cm. Circles indicate the bipolar electrodes providing surface potentials with RMS amplitude greater than 50% of the maximal amplitude obtained for each of the 12 inter-electrode distances considered.