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Spinal cord modulation associated with isometric contractions.

Julie A Robichaud1, Denis Brunt, L Keith Tennant

  • 1School of Kinesiology, Motor Control Laboratory, University of Illinois at Chicago, 901 W. Roosevelt Road, Chicago, IL 60608-1516, USA. jrobicha@uic.edu

Brain Research
|September 17, 2002
PubMed
Summary
This summary is machine-generated.

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This study investigated the excitation pulse in voluntary movement, finding that target size and force level influence spinal excitability. Results support the existence of a movement-regulated excitation pulse.

Area of Science:

  • Neuroscience
  • Motor Control
  • Human Physiology

Background:

  • The dual-strategy hypothesis proposes that voluntary movements are modulated by distinct excitation pulses.
  • Investigating spinal excitability changes (H-reflex) before voluntary contractions can reveal these modulations.

Purpose of the Study:

  • To evaluate the existence of an excitation pulse by quantifying changes in spinal excitability.
  • To assess how target size and force level impact the timing and magnitude of these changes.

Main Methods:

  • Subjects performed ballistic plantar flexion isometric contractions at varying force levels (25%, 50% MVC) and target sizes (5%, 15%).
  • Soleus motor neuron reflex excitability was measured via H/M ratio, with H-reflex elicited at different time intervals before contraction.

Related Experiment Videos

Main Results:

  • Target size significantly affected the timing, slope, and peak of spinal excitability changes.
  • Force level significantly influenced the slope and peak of spinal excitability, but not its timing.
  • A two-way repeated-measures ANOVA revealed these significant effects.

Conclusions:

  • Both target size and force level modulate the facilitation of spinal excitability during voluntary movement.
  • Target size specifically influences the timing of this facilitation.
  • Findings support the existence of a movement-specific excitation pulse regulating voluntary contractions.