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Related Concept Videos

Motor Unit Stimulation01:20

Motor Unit Stimulation

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When the neuron of a motor unit fires an action potential, it triggers a series of events, leading to a twitch contraction in the muscle fibers. The process of excitation-contraction coupling is crucial in relaying the action potential to the muscle fibers.
The latent period of contraction marks the onset of excitation-contraction coupling, when the action potential propagates across the sarcolemma, preparing the muscle fibers for contraction. As the fibers enter the contraction phase, the...
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Evidence for Increased High Alpha Intermuscular Coherence as a Measure of Reticulospinal Motor Drive.

Nicole Sarah Holliger1,2,3, Freschta Zipser-Mohammadzada1,2,3, Daniel Fabio Carpanese1

  • 1Spinal Cord Injury Center, Balgrist University Hospital, University of Zurich, Zurich, Switzerland.

The European Journal of Neuroscience
|April 24, 2026
PubMed
Summary
This summary is machine-generated.

Intermuscular coherence, a measure of neural drive, shows promise for assessing the reticulospinal (RS) system. This method effectively reflects RS contributions to movement control, particularly during balance tasks.

Keywords:
EMG–EMG coherenceStartReactintermuscular coherencepostural controlreticulospinalstartle reflex

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Area of Science:

  • Neuroscience
  • Motor Control
  • Human Movement

Background:

  • The reticulospinal (RS) system is crucial for human movement but difficult to study.
  • Current methods for assessing RS drive are limited by intense stimuli.
  • New biomarkers are needed to characterize RS system function.

Purpose of the Study:

  • To investigate intermuscular coherence as a biomarker for RS neural drive.
  • To evaluate RS system involvement in the startle reflex, StartReact, and postural control.
  • To determine if intermuscular coherence can differentiate task-specific RS contributions.

Main Methods:

  • Analyzed intermuscular coherence in neck, shoulder, and arm muscles during startle reflex.
  • Examined tibialis anterior intermuscular coherence during StartReact, postural perturbations, balance tasks, and non-postural movements.
  • Utilized electroencephalography (EEG) and electromyography (EMG) to measure neural activity and muscle activation.

Main Results:

  • Intermuscular coherence in the high alpha band increased during startle reflex and StartReact, suggesting RS system activation.
  • Enhanced coherence was observed during postural perturbations and balance control tasks.
  • RS drive, reflected by high alpha band coherence, was critical for balance but not non-postural ankle movements.

Conclusions:

  • Intermuscular coherence in the high alpha band is a viable biomarker for assessing RS motor drive.
  • The RS system plays a significant role in postural control and balance.
  • This approach offers a feasible method for evaluating RS system function during various movements.