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Related Experiment Videos

Quantification of quadriceps and hamstring antagonist activity

E Kellis1

  • 1Division of Sport and Recreation, University of Northumbria at Newcastle, Newcastle upon Tyne, England.

Sports Medicine (Auckland, N.Z.)
|February 12, 1998
PubMed
Summary
This summary is machine-generated.

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Quantifying antagonist muscle activation around the knee, like hamstrings and quadriceps coactivation, is complex. Factors like movement type and methodological choices impact electromyography (EMG) signals, hindering comparisons and understanding knee stability contributions.

Area of Science:

  • Biomechanics
  • Kinesiology
  • Sports Medicine

Background:

  • Coactivation of knee antagonist muscles (hamstrings and quadriceps) is crucial for joint stability and cruciate ligament health.
  • Electromyography (EMG) is commonly used to study this coactivation, but results are affected by various factors.

Purpose of the Study:

  • To review and present findings on quantifying antagonist muscle activation around the knee.
  • To highlight challenges in measuring and interpreting antagonist EMG data.

Main Methods:

  • Review of existing literature on antagonist muscle coactivation and EMG.
  • Discussion of factors influencing EMG measurements (muscle action, velocity, effort, position).
  • Analysis of methodological challenges including cross-talk and normalization techniques.

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Main Results:

  • Antagonist EMG is influenced by numerous physiological and methodological factors, leading to inconsistencies across studies.
  • Cross-talk between hamstring and quadriceps EMG signals is affected by electrode characteristics and muscle properties.
  • Normalization methods for EMG vary, complicating inter-study comparisons.

Conclusions:

  • Accurate quantification of antagonist muscle function requires considering factors affecting EMG.
  • Direct measurement of antagonist moments/forces is challenging, though mathematical models offer potential.
  • Quadriceps contraction near extension generates significant anterior shear forces, underscoring the role of antagonists in knee stability, though the precise magnitude remains unclear.