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Updated: Dec 18, 2025

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Quantitative electromyography: Normative data in paraspinal muscles.

Tina D Jeppesen1, Lotte Levison2, Luca Codeluppi3

  • 1Copenhagen Neuromuscular Center, Department of Neurology, Rigshospitalet, University of Copenhagen, Copenhagen, Denmark.

Muscle & Nerve
|June 13, 2020
PubMed
Summary

Electromyography (EMG) of paraspinal muscles reveals key insights into motor unit potentials. Unlike limb muscles, paraspinal EMG parameters show no age-related changes, suggesting stable neuromuscular function.

Keywords:
EMGanterior horn cell diseasehead dropmyopathyneuromuscular disordernormative dataparaspinal musclequantitative electromyographyspinal segment

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Area of Science:

  • Neurology
  • Musculoskeletal System
  • Diagnostic Tools

Background:

  • Quantitative electromyography (EMG) is a valuable diagnostic tool for paraspinal muscles.
  • Normative data for paraspinal muscle EMG are currently lacking.

Purpose of the Study:

  • To establish normative electrodiagnostic data for paraspinal muscles.
  • To investigate the influence of age and sex on paraspinal muscle EMG parameters.

Main Methods:

  • Needle EMG was performed on 65 healthy subjects (aged 21-82 years) at the C7, Th10, and L5 spinal segments bilaterally.
  • Evaluated parameters included spontaneous activity, motor unit potential (MUP) characteristics (amplitude, duration, polyphasia), and recruitment patterns during maximal voluntary contraction (MVC).

Main Results:

  • The incidence of fibrillation potentials in paraspinal muscles was comparable to limb muscles.
  • Mean MUP duration and amplitude, along with MVC amplitude, increased caudally.
  • EMG parameters did not demonstrate significant correlations with subject age or sex.

Conclusions:

  • Paraspinal muscle EMG parameters exhibit distinct characteristics compared to limb muscles, notably the absence of age-related changes.
  • Polyphasic potentials were observed more frequently in paraspinal muscles than in limb muscles.
  • An EMG gradient suggests a progressive increase in motor unit size in more caudal paraspinal segments.