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Related Experiment Videos

Correlation between tremor parameters.

Ivan Milanov1

  • 1St Naum University Neurological Hospital, Sofia, Bulgaria. milanovivan@hotmail.com

Functional Neurology
|June 28, 2002
PubMed
Summary

Electromyography (EMG) measurements correlate well with clinical tremor scores, aiding in understanding tremor mechanisms. This study found tremor amplitude increases with disease progression, while frequency decreases.

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Area of Science:

  • Neurology
  • Biomedical Engineering

Background:

  • The relationship between clinical tremor assessments and objective electromyography (EMG) measurements is not well-defined.
  • Limited research exists on correlations between various tremor parameters.

Purpose of the Study:

  • To investigate correlations between different tremor parameters, clinical scoring, patient age, and disease duration.
  • To evaluate the utility of EMG in tremor research.

Main Methods:

  • 525 patients with various tremor types were assessed.
  • Tremor was clinically scored using the Webster Tremor Scale.
  • Surface EMG recorded tremor amplitude in different limb positions.

Main Results:

  • Moderate correlation found between EMG-measured tremor amplitude and Webster scores.
  • Low-frequency tremors exhibited higher amplitude and longer durations.
  • Tremor amplitude increased, while frequency decreased with disease progression.
  • Strong positive correlations between tremor parameters across different limb positions suggest a common oscillator.

Conclusions:

  • Clinical tremor scores correlate well with EMG amplitude measurements.
  • EMG is a valuable tool for researching tremor mechanisms and progression.

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