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Updated: Mar 12, 2026

Assessing Corticospinal Excitability During Goal-Directed Reaching Behavior
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Task-dependent intermuscular coherence between postural muscles during voluntary upright reaching.

Imma Ceriello1,2, Riccardo Borzuola1, Valentina Camomilla1

  • 1Laboratory of Bioengineering and Neuromechanics, Department of Movement, Human and Health Sciences, University of Rome 'Foro Italico', Rome, Italy.

Experimental Physiology
|March 10, 2026
PubMed
Summary
This summary is machine-generated.

Neural coherence in postural muscles adapts to reaching tasks. Forward reaching emphasizes bilateral coordination, while lateral reaching involves asymmetric strategies for stability, showcasing adaptable neural control.

Keywords:
EMG–EMG coherencecommon inputintermuscular coherencepostural controlupright reaching

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Area of Science:

  • Neuroscience
  • Biomechanics
  • Motor Control

Background:

  • Intermuscular coherence reveals neural coordination of posture and movement.
  • Understanding task-specific muscle coordination is crucial for motor control research.

Purpose of the Study:

  • Investigate how coherence between postural muscles changes during forward and lateral reaching tasks.
  • Examine the neural mechanisms underlying task-dependent muscle coordination in young adults.

Main Methods:

  • Recorded bilateral electromyographic (EMG) activity from trunk and ankle muscles.
  • Analyzed intermuscular coherence in delta, alpha, beta, and low gamma frequency bands.
  • Correlated coherence with movement parameters like center-of-pressure path length and co-contraction.

Main Results:

  • Forward reaching showed higher delta-band coherence in homologous muscles and posterior chain pairs compared to lateral reaching.
  • Lateral reaching exhibited increased delta-band coherence in non-dominant ankle antagonist pairs, along with higher beta/low gamma coherence.
  • Ankle agonist pairs displayed greater delta-band coherence than antagonists, suggesting synergistic roles in postural control.

Conclusions:

  • Coherence organization adapts to specific postural demands, with forward reaching favoring sagittal stability and lateral reaching employing asymmetric strategies.
  • Findings highlight the neural control system's adaptability in regulating muscle coordination based on mechanical requirements.
  • Modulation of intermuscular coherence reflects a combination of automatic and voluntary neural processes during complex movements.