Physiology Commons^™

A Comparison Of Motor Unit Control Strategies Between Two Different Isometric Tasks, Sunggun Jeon, William M. Miller, Xin Ye

Faculty and Student Publications

© 2020 by the authors. Licensee MDPI, Basel, Switzerland. Background: This study examined the motor unit (MU) control strategies for non-fatiguing isometric elbow flexion tasks at 40% and 70% maximal voluntary isometric contraction. Methods: Nineteen healthy individuals performed two submaximal tasks with similar torque levels: contracting against an immovable object (force task), and maintaining the elbow joint angle against an external load (position task). Surface electromyographic (EMG) signals were collected from the agonist and antagonist muscles. The signals from the agonist were decomposed into individual action potential trains. The linear regression analysis was used to examine the MU recruitment threshold …