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. 2015 Oct 6;6:279. doi: 10.3389/fphys.2015.00279

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Copyright © 2015 Hu, Suresh, Xue and Rymer.

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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X and Y centroid locations of the RMS in different tasks. (A) The Y coordinate of the centroid in the longitudinal direction was calculated as a percentage of the forearm length from the olecranon process (0%) to the styloid process (100%) of the ulna. Error bars represent standard errors between subjects. (B) The X coordinate of the centroid in the circumferential direction was calculated as a percentage of forearm circumference from radial–flexor to ulnar–extensor (0% on the medial side of the forearm to flexor, then to extensor, and to 100% on the medial side of the forearm).