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. 2017 Nov 24;7:16220. doi: 10.1038/s41598-017-16151-5

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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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Mean phase angle of beat time in the good coordination group (a) and the poor coordination group (b) as a function of beat rate. Relative phase values equal to 0° indicate flexion on the beat and values equal to 180° indicate extension on the beat. The range from −180° to 0° is flexion phase and from 0° to 180° is extension phase. Vertical bars represent between-participant standard error. Lower error bars are for the Flexion-on-the-beat condition, and upper error bars are for the Extension-on-the-beat condition.