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. 2017 Jan 20;5(2):e13111. doi: 10.14814/phy2.13111

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© 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.

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(A) Concentric knee extension isometric trapezoid force trace (MVC%) with 3 plateau phase time periods in which motor unit firing (MUFR) analysis was conducted. (B) Firing rate bar plot. Vertical lines represent the firings of each motor unit and the black line indicates the force trace. The red broken line boxes denote the three identified motor unit populations used for analysis; (1) early‐recruited; (2) mid‐recruited; and (3) later‐recruited motor units. MUFT, motor unit firing rate.