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Keywords:

  • common drive;
  • EMG decomposition;
  • motor control;
  • motor unit;
  • muscle damage

Abstract

Introduction:

The purpose of this study was to investigate the effects of eccentric exercise on common drive.

Methods:

Eleven men, age 23.6 ± 2.1 (mean ± SD) years, performed trapezoid isometric muscle actions of the dominant forearm flexors immediately before and after 1 of 2 interventions: (a) 6 sets of 10 maximal eccentric isokinetic muscle actions of the forearm flexors; or (b) 10 minutes of quiet resting. Surface electromyographic signals were recorded from the biceps brachii and decomposed into individual motor unit action potential trains. Mean firing rate patterns were calculated for each motor unit, and all possible combinations were cross-correlated to measure common drive.

Results:

The peak cross-correlation coefficients were generally in the 0.2–0.5 range and occasionally as high as 0.7.

Conclusion:

These coefficients were not, however, affected by the eccentric exercise, despite a 19.5% decrease in strength, indicating that the eccentric exercise did not affect common drive. Muscle Nerve, 2012