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. 2019 May 20;9:7620. doi: 10.1038/s41598-019-43824-0

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© The Author(s) 2019

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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Normalized distribution of the relative phase of the group of subjects after exclusion of those subjects whose performance stability (CV) of finger tapping or walking was greater than 15%. (A) Self-paced walking task. (B) Given-paced walking task. (C) Bipedal heel striking task. (D) Unipedal heel striking task. Bars are s.d. * and ^# indicate significant differences from the bars centering on 0° and 180°, respectively.