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. 2019 Jan 18;20:28. doi: 10.1186/s12891-018-2387-x

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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. 2 — Flexion relaxation ratio definition and calculation. The flexion relaxation ratio is calculated by dividing EMG activity while the subject is fully flexed for 3 s (numerator) by the sum of EMG activity in the eccentric plus concentric phases of flexion (denominator)