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. 2020 Jan 22;20:33. doi: 10.1186/s12883-020-1611-0

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© The Author(s). 2020

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 — Relationship between outcomes. a: correlation between modified fatigue impact scale physical subcomponent change score and fast walking speed change score (r_s = − 0.847, p = 0.008); b: correlation between modified fatigue impact scale total change score and maximal respiratory exchange ratio change score (r_s = − 0.810, p = 0.015); c: correlation between resting serum brain-derived neurotrophic factor change score and maximal respiratory exchange ratio change score (r_s = 0.786, p = 0.036); d: correlation between resting serum interleukin-6 change score and maximal oxygen consumption change score (r_s = − 0.757, p = 0.049). r_s, Spearman correlation coefficient; p, significance