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. 2019 Dec 27;11:38. doi: 10.1186/s13102-019-0147-3

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© The Author(s). 2019

Open Access This 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 — Force tracings of electrically evoked contractions of the quadriceps muscle (from the sixth to the last contraction) (a) in the whole group in part I and part II of the study and (B) for electrical stimulation preceded by LLLT irradiations and sham-LLLT interventions. EEC – electrically evoked contractions; MVC – maximal isometric voluntary contraction; LLLT – neuromuscular electrical stimulation preceded by low level laser irradiation; sham-LLLT – neuromuscular electrical stmulation preceded by sham low level laser intervention; values are means ± SE; differences between part I and part II (a) as well as between LLLT and sham-LLLT interventions (b) were not significant (p > 0.05 for group or group and time interaction).