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. 2017 Jun 16;45(3):136–145. doi: 10.1249/JES.0000000000000112

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Copyright © 2017 The Author(s). Published by Wolters Kluwer Health, Inc. on behalf of the American College of Sports Medicine.

This is an open-access article distributed under the terms of the Creative Commons Attribution-Non Commercial-No Derivatives License 4.0 (CCBY-NC-ND), where it is permissible to download and share the work provided it is properly cited. The work cannot be changed in any way or used commercially without permission from the journal.

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The motor units (MU) activity pattern in the right trapezius muscle for one subject performing 10 double-clicks on a computer mouse with the right index finger. The double-clicks are shown as bars in the upper trace. Three MU are continuously active with an instantaneous firing rate (IFR) modulation related to the timing of the double-click. The bottom of the figure shows the activity of one MU consistently only showing activity during the double-click and mostly with double discharges indicated by the high bars. [Adapted from (87). Copyright © 2014 the authors.]