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. 2022 Oct 14;10:980454. doi: 10.3389/fpubh.2022.980454

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Copyright © 2022 Cheng, Wang, He and Yan.

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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Changs in the three groups at different time points. MFG, medium-frequency group; HFG, high-frequency group; CG, control group. Values at different time points were compared with the baseline in the same group: a1 (MFG), a2 (HFG), and a3 (CG) indicate P < 0.05; A1 (MFG), A2 (HFG), and A3 (CG) indicate P < 0.01. MFG or CG was compared with HFG at the same point in time: b1 (MFG) and b3 (CG) indicate P < 0.05. B1 (MFG) and B3 (CG) indicate P < 0.01. CG was compared with MFG at the same point in time. c3 (CG) indicates P < 0.05. (A) VAS score. (B) IL-6. (C) LDH. (D) CK. (E) 60 °/s peak torque. (F) 240 °/s peak torque.