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. 2018 Dec 17;15:119. doi: 10.1186/s12984-018-0463-y

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© The Author(s) 2018

Open Access This article is distributed under the terms of the Creative Commons Attribution 4.0 International License(http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided 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 Creative Commons Public Domain Dedication waiver(http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Fig. 2 — Fatigue test. Scheme of the task for the flexion group (FG) during a flexion movement (Panel a) and the extension group (EG) during an extension movement (Panel b). The blue circle represents the end-effector of the subject, the yellow circle is the target to reach