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Related Experiment Videos

Contralateral movement and extensor force generation alter flexion phase muscle coordination in pedaling.

L H Ting1, S A Kautz, D A Brown

  • 1Rehabilitation Research and Development Center (153), Veterans Affairs Palo Alto Health Care System, Palo Alto 94304-1200, California.

Journal of Neurophysiology
|June 10, 2000
PubMed
Summary

Neural pathways linking legs influence muscle coordination during pedaling. Contralateral leg activity reduces hamstring muscle activation during the flexion phase, suggesting a feedforward control mechanism.

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Area of Science:

  • Neuroscience
  • Human Motor Control
  • Biomechanics

Background:

  • Bilateral sensorimotor signals are crucial for locomotion coordination in animals.
  • Mechanical interleg coupling in humans confounds the study of these signals.
  • Previous research eliminated mechanical coupling to show interlimb pathways shape muscle coordination.

Purpose of the Study:

  • To investigate the relationship between the contralateral leg's sensorimotor state and ipsilateral muscle coordination during pedaling.
  • To differentiate between feedforward and feedback mechanisms in interlimb motor control.

Main Methods:

  • Subjects pedaled unilaterally while the contralateral leg performed varied tasks: extensor force generation, relaxation, stationary hold, or antiphase movement.
  • Muscle activity (integrated electromyography) of the pedaling leg was recorded during the flexion phase.

Related Experiment Videos

  • Contralateral leg force and movement were controlled by a servomotor.

    • Main Results:

    • Contralateral extensor force generation significantly reduced pedaling leg hamstring (biceps femoris, semimembranosus) activity during flexion by 25-30%.
    • This reduction occurred regardless of the contralateral leg's force amplitude or movement status.
    • Rectus femoris and tibialis anterior activity decreased only when the contralateral leg generated high rhythmic force with movement.

    Conclusions:

    • Results support a contralateral feedforward mechanism influencing hamstring activity during pedaling flexion.
    • A contralateral feedback mechanism appears to modulate rectus femoris and tibialis anterior activity.
    • These interlimb neural mechanisms may coordinate antagonistic muscle functions and are potentially relevant for walking.