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. 2019 Aug 22;18:89. doi: 10.1186/s12938-019-0708-4

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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. 1 — Hip flexion angles in treadmill and over-ground exercises. a Hip flexion angles during walking at 100 and 120 steps/min. b Hip flexion angles during running at 140 and 160 steps/min. c Sagittal motion range of hip joint in walking. d Sagittal motion range of hip joint in running