Motor unit recruitment and discharge behavior in movements and isometric contractions

Muscle & Nerve
T IvanovaK J Miller

Abstract

The purpose of this study was to contrast the discharge patterns of the same motor units during movements and during isometric contractions that were produced with comparable torque-time characteristics. Subjects performed elbow flexion and extension movements with predetermined acceleration characteristics. The average acceleration and deceleration profiles for the movements were reproduced in the isometric setting by presenting the kinematic profiles as templates for torque production. Trained subjects were able to match the first agonist (AG1) and antagonist (ANT) electromyographic (EMG) bursts, but tended to produce a smaller second agonist burst (AG2) in the isometric contraction. Twenty-five motor units from triceps brachii were studied. The same motor units (with one exception) were recruited and subsequently discharged in a similar fashion in both the isometric and movement tasks in the AG1 and ANT EMG bursts, with fewer motor unit discharges in the AG2 burst in the isometric contraction. The central control mechanisms appear to be the same for the acceleration phase of movement and isometric contraction, but differ during the deceleration phase.

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Citations

Nov 14, 2012·Journal of Electromyography and Kinesiology : Official Journal of the International Society of Electrophysiological Kinesiology·Harri PiitulainenJanne Avela
Feb 2, 2010·Journal of Electromyography and Kinesiology : Official Journal of the International Society of Electrophysiological Kinesiology·J KallioV Linnamo
Mar 8, 2011·Annals of Physical and Rehabilitation Medicine·S Boyas, A Guével
Jan 11, 2001·Muscle & Nerve·R M Enoka, A J Fuglevand
Sep 7, 2018·Applied Physiology, Nutrition, and Metabolism = Physiologie Appliquée, Nutrition Et Métabolisme·Mathew I B Debenham, Geoffrey A Power
Jun 24, 2006·Journal of Applied Physiology·Jacques DuchateauRoger M Enoka
Mar 7, 2019·European Journal of Applied Physiology·Matthew M MalletteStephen S Cheung

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