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Related Experiment Video

Updated: Jan 29, 2026

Measuring Contralateral Silent Period Induced by Single-Pulse Transcranial Magnetic Stimulation to Investigate M1 Corticospinal Inhibition
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Cutaneous silent periods in multiple system atrophy.

Ivana Stetkarova1, Markus Kofler, Veronika Majerova2

  • 1Department of Neurology, Third Faculty of Medicine, Charles University in Prague, Prague, Czech Republic.

Biomedical Papers of the Medical Faculty of the University Palacky, Olomouc, Czechoslovakia
|November 13, 2013
PubMed
Summary

Cutaneous silent periods (CSPs) are prolonged in multiple system atrophy (MSA) patients, confirming abnormal reflex findings. Long-term levodopa treatment did not influence these CSP abnormalities in MSA.

Keywords:
atypical parkinsonismcutaneous silent periodlevodopamultiple system atrophyspinal reflex

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Area of Science:

  • Neuroscience
  • Clinical Neurology

Background:

  • The cutaneous silent period (CSP) is a spinal inhibitory reflex mediated by A-delta fibers.
  • Prolonged CSPs are observed in restless legs syndrome (RLS) and idiopathic Parkinson's disease (IPD).
  • Dopaminergic medication, like levodopa, can normalize CSPs in some conditions.

Purpose of the Study:

  • To confirm abnormal CSP findings in multiple system atrophy (MSA) patients.
  • To investigate the effect of long-term levodopa treatment on CSPs in MSA patients.

Main Methods:

  • CSP recordings were performed in 15 possible MSA patients and 16 healthy controls.
  • Noxious digit II stimulation was used to elicit CSPs in thenar muscles.
  • Patients were assessed for levodopa treatment status and dosage.

Main Results:

  • MSA patients exhibited significantly delayed CSP onset, end latency, and prolonged CSP duration compared to controls.
  • No significant difference in CSP parameters was found between MSA patients on levodopa and those not receiving it.
  • Levodopa dosage did not correlate with any measured CSP parameter.

Conclusions:

  • Prolonged CSPs are a consistent finding in MSA patients.
  • Long-term levodopa treatment does not appear to normalize CSP abnormalities in MSA.
  • This ineffectiveness aligns with the limited clinical efficacy of levodopa in MSA.