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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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Peak torque during maximal voluntary contraction (MVC, A) of plantar flexion, voluntary activation (VA%, B), root mean square of the electromyogram (RMS-EMG) of the medial gastrocnemius (MG, C), lateral gastrocnemius (LG, D), soleus (SOL, E), and tibialis anterior (TA, F), and V-wave of MG (G) and SOL (H) during plantar flexor MVC before and after the intervention. Data are shown as mean + standard deviation. RMS-EMGs of the triceps surae and V-waves were normalized to the peak-to-peak compound muscle action potential amplitude at rest (M_max) and during MVC (M_wave), and RMS-EMG of TA was normalized to that during dorsiflexor MVC. *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.