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. 2018 Sep 17;8:13894. doi: 10.1038/s41598-018-32297-2

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© The Author(s) 2018

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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RGS scores are greater in the 3.5N loading group than either the 2N (*p < 0.05) or 0N (^p < 0.03) group during the loading period (days 1, 3, 5) and immediately after the cessation of loading (day 7). The scores for the 2N and 0N loading groups are not different from each other at any day.