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Related Experiment Videos

EMG activity and voluntary activation during knee-extensor concentric torque generation.

Nicolas Babault1, Michel Pousson, Anne Michaut

  • 1Groupe Analyse du Mouvement (GAM), Faculté des Sciences du Sport, Université de Bourgogne, BP 27877, 21078 Dijon Cedex, France. nicolas.babault@u-bourgogne.fr

European Journal of Applied Physiology
|April 11, 2002
PubMed
Summary

Neural drive for knee extensors is lower during maximal concentric contractions compared to isometric ones. This indicates that torque output is regulated by a complex interplay between muscle properties and neural drive, influenced by concentric angular velocity.

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Part I: Effects of Asynchronous vs Conventional Synchronous Neuromuscular Electrical Stimulation on Maximal Evoked Torque, Fatigability, Discomfort, and Strength Gains: A Systematic Review With Meta-analysis and Meta-regression.

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Area of Science:

  • Neuromuscular Physiology
  • Biomechanics
  • Exercise Science

Background:

  • Understanding neural drive is crucial for comprehending muscle force production.
  • Previous research has explored neural drive during isometric contractions, but less is known about its modulation during dynamic movements.
  • The twitch interpolation technique and electromyography (EMG) are key methods for assessing neural activation.

Purpose of the Study:

  • To compare the neural drive of knee extensors during isokinetic concentric and isometric muscular actions.
  • To investigate the influence of concentric angular velocity on neural drive and torque output.
  • To examine the relationship between neural activation and electromyography (EMG) during sub-maximal contractions.

Main Methods:

  • Nine subjects performed maximal and sub-maximal voluntary contractions under isometric, 60°/s, and 120°/s concentric conditions.

Related Experiment Videos

  • Twitch interpolation technique measured activation level (AL) of knee extensors.
  • Surface electromyography (EMG) recorded root mean square (RMS) amplitudes of knee extensors and flexors.

    • Main Results:

    • Maximal voluntary torque was significantly lower during concentric (60°/s and 120°/s) compared to isometric contractions.
    • Activation level (AL) and average RMS amplitudes (av.RMS) were significantly lower during maximal 60°/s concentric contractions versus isometric and 120°/s concentric contractions.
    • RMS/torque and AL/av.RMS relationships were consistent across muscles and contractile conditions during sub-maximal contractions.

    Conclusions:

    • Neural drive, assessed by av.RMS and AL, is similarly described during maximal and sub-maximal efforts.
    • Maximal voluntary efforts show neural drive dependent on concentric angular velocity up to 120°/s.
    • Torque output regulation involves complex interactions between intrinsic muscular properties and neural drive, modulated by contractile conditions.