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. 2021 Sep 21;15:735470. doi: 10.3389/fnins.2021.735470

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Copyright © 2021 Zheng, Chen, Yang and Wang.

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) and the copyright owner(s) 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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PPT in different sites before and after intervention in the three groups. (A) Thenar muscle PPT. (B) Sacrospinalis PPT. (C) Rectus femoris PPT. (D) Tibialis anterior PPT. On the left of the vertical dotted line are the PPT values before and after intervention of individuals (dots: purple for Group 1, green for Group 2, and red for Group 3) and groups (black line: X ± SD). The data on the right of the vertical dotted line are the individual (dot) and group (black line: X ± SD) values of the difference in PPT after intervention (△ = posttest–pretest). PPT: pressure pain threshold; Pre: pretest; Post: posttest. *p < 0.05; **p < 0.01.