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Role of limb movement in the modulation of motor unit discharge rate during fatiguing contractions.

Authors
  • Griffin, L
  • Ivanova, T
  • Garland, S J
Type
Published Article
Journal
Experimental brain research
Publication Date
Feb 01, 2000
Volume
130
Issue
3
Pages
392–400
Identifiers
PMID: 10706437
Source
Medline
License
Unknown

Abstract

Motor unit firing rates of the triceps brachii muscle have been shown to decline during sustained isometric contractions, but not if the fatiguing contraction incorporates arm movements. The purpose of this study was to determine the impact of the actual physical displacement of the limb on the maintenance of motor unit discharge rate during dynamic muscle fatigue. An isometric force pulse paradigm was used to recreate the motor unit activity patterns that occur during a dynamic contraction. With this paradigm, the variable force output that would occur during a dynamic contraction remained intact, but the movement of the limb was eliminated. Motor unit firing rates declined in the isometric force pulse protocol. Thus, factors related to the actual movement of the limb appear to enable the maintenance of motor unit discharge rates during fatigue.

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