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Changes in kinematic and EMG variability while practicing a maximal performance task.

David A Gabriel1

  • 1Biomechanics Laboratory, Brock University, St Catharines, ON, Canada L2S 3A1. dgabriel@arnie.pec.brocku.ca

Journal of Electromyography and Kinesiology : Official Journal of the International Society of Electrophysiological Kinesiology
|September 12, 2002
PubMed
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Practicing a maximal performance task improved limb speed and reduced errors. Electromyographic (EMG) and kinematic variability decreased, indicating enhanced central nervous system control over movement.

Area of Science:

  • Motor control and learning
  • Biomechanics
  • Neuroscience

Background:

  • Motor skill acquisition involves changes in movement variability.
  • Understanding how practice affects electromyographic (EMG) and kinematic variability is crucial for motor learning theories.

Purpose of the Study:

  • To investigate the impact of practicing a maximal performance task on EMG and kinematic variability.
  • To explore the relationship between changes in EMG and kinematic variability during motor learning.

Main Methods:

  • Eight subjects performed rapid elbow flexion to a target over four practice sessions.
  • Angular displacement was recorded using a potentiometer.
  • EMG activity of biceps and triceps brachii was monitored using surface electrodes.

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Main Results:

  • Limb speed increased, while target error and trajectory variability decreased.
  • Absolute EMG variability increased, but the coefficient of variation of mean EMG amplitude decreased.
  • Triceps motor time variability decreased, while biceps motor time variability remained unchanged.

Conclusions:

  • Practice leads to reduced kinematic variability and improved movement accuracy.
  • Despite increased absolute EMG variability, a decrease in the coefficient of variation suggests more precise muscle activation control.
  • Findings indicate enhanced central nervous system control over spatial-temporal aspects and muscle force regulation during motor practice.