Effects of practice on myoelectric and kinematic correlates of human movement

Slobodan Jaric*, Daniel M. Corcos, Gerald L. Gottlieb, Gyan C. Agarwal

*Corresponding author for this work

Research output: Contribution to journalConference articlepeer-review


Eight subjects performed 1400 fast, accurate elbow flexion movements in blocks of two hundred trials over a two week period. Kinematic and electromyographic (EMG) changes were most noticeable over the first 600 to 1000 trials. Peak acceleration, peak deceleration and peak velocity all increased. The increase in peak deceleration was much more pronounced than the increase in peak acceleration and the movements became more oscillatory. There was also a substantial decrease in the variability of peak movement velocity. Analysis of the EMGs from agonist and antagonist muscles suggests that the increased performance (as reflected in the kinematic parameters) is associated with the following changes in EMG parameters. The slope of the rising phase of the agonist and antagonist EMGs increased and the second agonist burst became larger and more consistent.

Original languageEnglish (US)
Number of pages1
JournalJournal of Biomechanics
Issue number10
StatePublished - Jan 1 1989
EventAbstracts of the XII Congress, International Society of Biomechanics - Los Angeles, CA, USA
Duration: Jun 26 1989Jun 30 1989

ASJC Scopus subject areas

  • Biophysics
  • Orthopedics and Sports Medicine
  • Biomedical Engineering
  • Rehabilitation


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