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. 2014 Dec 16;8:1002. doi: 10.3389/fnhum.2014.01002

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Copyright © 2014 Dean, Clair-Auger, Lagerquist and Collins.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution and 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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Motor unit discharge rate was not proportional to stimulation frequency. (A) As illustrated for a single motor unit activated by three stimulation frequencies, there is a gradual increase in discharge rate, which then reaches a steady-state. The solid horizontal line shows the duration of the stimulation. (B) Averaged across subjects, the peak discharge rate was significantly (*p < 0.05) lower during 20 Hz stimulation than during 30 or 40 Hz stimulation. (C) Averaged across subjects and stimulation frequency, motor unit discharge rate during the first second of sustained firing was significantly (*p < 0.05) lower than the discharge rate during the last second of stimulation.