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Related Experiment Video

Updated: Feb 9, 2026

Standing Neurophysiological Assessment of Lower Extremity Muscles Post-Stroke
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Assessing Hand Muscle Structural Modifications in Chronic Stroke.

Ya Zong1,2,3, Henry H Shin3, Ying-Chih Wang4

  • 1Ruijin Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai, China.

Frontiers in Neurology
|June 6, 2018
PubMed
Summary

Post-stroke muscle impedance changes indicate structural alterations like fiber loss or fat infiltration. These electrical conductivity changes correlate with compound muscle action potential amplitude in the paretic hand.

Keywords:
compound muscle action potentialelectrical impedance myographyhandmusclestroke

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Area of Science:

  • Neurology
  • Biophysics
  • Rehabilitation Science

Background:

  • Stroke often leads to muscle weakness and structural changes in affected limbs.
  • Understanding these post-stroke muscle alterations is crucial for effective rehabilitation strategies.

Purpose of the Study:

  • To assess post-stroke muscle structural alterations using electrical impedance myography and electrophysiology.
  • To investigate the relationship between muscle impedance and compound muscle action potentials (CMAP) in stroke survivors.

Main Methods:

  • Muscle impedance and CMAP were measured bilaterally from the hypothenar muscle.
  • Electrical impedance myography (EIM) and electrophysiological techniques were employed.

Main Results:

  • Significant differences in muscle impedance (resistance and phase angle) were observed between paretic and contralateral muscles.
  • Muscle impedance changes, particularly phase angle and reactance, showed moderate correlations with CMAP amplitude in the paretic hand.

Conclusions:

  • The study reveals significant muscle structural rearrangements in chronic stroke patients.
  • These alterations may result from fiber loss, atrophy, fat infiltration, or impaired membrane integrity, detectable through electrical properties.