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Intermuscular Coherence in Normal Adults: Variability and Changes with Age.

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Area of Science:

  • Neuroscience
  • Motor Control
  • Human Physiology

Background:

  • Intermuscular coherence (IMC) reflects neural control of muscle activity.
  • Understanding age-related changes in IMC is crucial for assessing nervous system health.

Purpose of the Study:

  • To investigate age-related changes in beta-band IMC in healthy adults.
  • To analyze inter- and intra-individual variability in IMC.
  • To establish a normative dataset for IMC.

Main Methods:

  • Measured beta-band IMC in upper and lower limbs of 92 healthy adults across six decades.
  • Analyzed age as a continuous and binned variable.
  • Assessed intrasession and intersession variance in IMC.

Main Results:

  • No significant age-related changes in IMC amplitude were observed.
  • Interindividual variability in IMC was substantial (two orders of magnitude).
  • Intrasession and intersession variance exceeded statistical expectations, indicating other contributing factors.

Conclusions:

  • Beta-band IMC is robust to aging, suggesting preserved neural coupling mechanisms.
  • High variability necessitates further investigation into influencing factors.
  • The study provides a normative IMC dataset for potential use as a biomarker in neurological diseases.