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. 2020 Oct 29;11:598996. doi: 10.3389/fphys.2020.598996

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Copyright © 2020 Ema, Kanda, Shoji, Iida and Akagi.

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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Rate of torque development (RTD, A) of plantar flexion and root mean square of the electromyogram (RMS-EMG) during explosive contraction of the medial gastrocnemius (MG, B), lateral gastrocnemius (LG, C), and soleus (SOL, D) before and after the intervention. Data are shown as mean + standard deviation. RTD was defined as the slope of the time-torque curve during time intervals of 0–100 ms from the onset of plantar flexion. RMS-EMGs of the triceps surae were normalized to the peak-to-peak compound muscle action potential amplitude at rest (M_max). *Indicates a significant difference between older and young men. † Denotes a significant change after the intervention. ‡Shows a significant difference between control and vibration conditions.