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. 2015 Dec 24;6:404. doi: 10.3389/fphys.2015.00404

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Copyright © 2015 Morin, Gimenez, Edouard, Arnal, Jiménez-Reyes, Samozino, Brughelli and Mendiguchia.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Typical foot (circles) and knee (triangles) path diagram during an entire sprint treadmill acceleration of a rugby player. The stride at maximal running velocity (9th stride in this trial) is shown with black circles and triangles. Positions are displayed with reference to the treadmill belt frame (vertical axis) and the subject's resting standing position was used for calibration (femoral marker in the horizontal axis). Position 1 indicates the maximal forward position of the foot and knee as retained for analyses. Position 2 indicates the initial foot-ground contact. The path of the foot marker from position 1 to position 2 is considered as the “pawing” backward motion of the foot at the end of the swing phase.