Figure - PMC

Skip to main content

An official website of the United States government

Here's how you know

Here's how you know

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you've safely connected to the .gov website. Share sensitive information only on official, secure websites.

View full-text article in PMC

. 2017 Feb 27;5(4):e13067. doi: 10.14814/phy2.13067

Search in PMC
Search in PubMed
View in NLM Catalog
Add to search

© 2017 The Authors. Physiological Reports published by Wiley Periodicals, Inc. on behalf of The Physiological Society and the American Physiological Society.

This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

PMC Copyright notice

Experimental records from one subject. Microstimulation of a single motor axon supplying extensor digitorum longus (EDL) with a 45‐sec train, delivered at a mean frequency of 18 Hz with (left panel) and without (right panel) variability. Channels 1 and 2 show the instantaneous frequency and corresponding stimulation pulses for both the irregular and continuous (regular) frequency trains. It can be seen that the irregular train exhibits significant discharge variability over the 45 sec compared with the regular train (zero variability). The top EMG channel shows significant electromyographic activity from surface electrodes over the anterior leg (TA), due to activation of a single motor axon in an EDL fascicle of the anterior compartment. The bottom EMG channel shows zero EMG activity over the lateral peroneus muscles (PER). The bottom channel displays the force responses generated by the two types of trains (irregular and regular). The irregular trains generate significantly greater force responses over the entirety of the 45‐sec train. This was confirmed in all subjects (n = 14).