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. 2016 Jul 16;13:64. doi: 10.1186/s12984-016-0170-5

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© The Author(s). 2016

Open AccessThis 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. 5 — Hamstrings (a) fiber length, (b) fiber velocity and (c) muscle activity. Data are shown for one typical example CP subject, for simulations without spasticity and with increasing gain (G) values. Muscle activity is normalized to maximum isometric contraction