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. 2019 May 4;20:192. doi: 10.1186/s12891-019-2562-8

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© The Author(s). 2019

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. 3 — Results of 2D longitudinal supraspinatus muscle strain. a, Muscle strain (%) correlated negatively with increasing load (%) (95% CI: -0.87% to − 0.58%; Pearson correlation coefficient). b, The mean muscle strain of the normal supraspinatus muscle of ten subjects at different isometric load conditions (40, 60, and 80%) demonstrating significantly increased strain rate with increasing load condition (One-way ANOVA p < 0.0001, F_(2,84) = 34.7). Error bars represent s.d. (n = 10, four independent measurements/load condition). ***p < 0.001; **** p < 0.0001