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Intermuscular co-ordination during fast contact control leg tasks in man

C A Doorenbosch1, T G Welter, G J van Ingen Schenau

  • 1Institute of Fundamental and Clinical Movement Sciences, Vrije Universiteit, Amsterdam, Netherlands. cdoor@knoware.nl

Brain Research
|March 21, 1997
PubMed
Summary
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Motor control strategies for leg extension differ between muscle types. Biarticular muscles control force direction, but monoarticular muscles do not act solely as work generators, challenging previous hypotheses.

Area of Science:

  • Biomechanics
  • Motor Control
  • Human Physiology

Background:

  • Previous studies suggested distinct roles for monoarticular and biarticular muscles in human leg extension.
  • Hypothesized that monoarticular muscles activate during shortening, while biarticular muscles control external force direction.

Purpose of the Study:

  • To experimentally test the hypothesis of different activation principles for mono- and biarticular muscles during leg extension.
  • To determine if observed roles in previous contact tasks generalize to broader motor control principles.

Main Methods:

  • Experiments conducted on a custom dynamometer with subjects performing leg extensions against prescribed force vectors.
  • Recorded position, force, and electromyography (EMG) activity of upper leg muscles.

Related Experiment Videos

  • Calculated net joint torques using inverse dynamics and correlated them with muscle EMG patterns.

    • Main Results:

    • Biarticular muscles (m. rectus femoris, hamstrings) consistently controlled external force direction, supporting prior observations.
    • Monoarticular muscles' actions did not align with the hypothesized role as simple work generators.
    • The hypothesis of distinct control mechanisms for mono- and biarticular muscles could not be confirmed for these specific tasks.

    Conclusions:

    • The distinct roles observed previously for mono- and biarticular muscles may not be a universal principle in motor control.
    • These findings suggest that the central nervous system (CNS) employs multiple strategies for controlling various contact tasks.
    • The control of leg extension involves more complex muscle coordination than initially hypothesized.