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. 2020 Apr 7;238(6):1371–1383. doi: 10.1007/s00221-020-05784-0

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© The Author(s) 2020

Open AccessThis 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 licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence 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 licence, visit http://creativecommons.org/licenses/by/4.0/.

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Fig. 8 — Co-contraction was not modulated with surface compliance in older adults but higher than younger adults. While in younger adults, co-contraction increased with surface compliance. Displayed are group relative duration of co-contraction of a soleus and tibialis anterior and b peroneus longus and tibialis anterior as a function of surface compliance in trials without peripheral nerve stimulation in young and older adults (n_old = 10, n_young = 10). Note that decreasing stiffness from left to right on the x-axis equates increasing surface compliance