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. 2017 Oct 18;7:13465. doi: 10.1038/s41598-017-13766-6

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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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The neural drive to muscles. Total number of pulses per second (pps) discharged by the population of motor neurons decoded across two levels of percentage maximal voluntary contraction (%MVCs). Discharge profiles are computed from motor neuron cumulative spikes trains (CST, Eq. 1) for all investigated muscles including: tibialis anterior (tibant), peroneus tertius (pertert), peroneus longus and brevis (perlong), soleus (sol), gastrocnemius lateralis (gaslat) and gastrocnemius medialis (gasmed). The 0% denotes the onset of the dorsi-flexing phase while the 100% denotes the completion of the plantar-flexing phase of the task. Data are reported for the ankle anatomical angular position. Within each graph values are averaged across all validation trials and subjects, with depicted profiles reflecting the first standard deviation band.