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[Clinical and physiological studies on senile tremor]

T Kachi1, T Yamada, A Igata

  • 1Department of Neurology, Chubu National Hospital.

Nihon Ronen Igakkai Zasshi. Japanese Journal of Geriatrics
|October 1, 1995
PubMed
Summary

Senile tremor, starting after age 60, shares characteristics with essential tremor, including similar frequency and response to perturbation. This suggests senile tremor may be a subtype of essential tremor.

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Area of Science:

  • Neurology
  • Movement Disorders
  • Geriatrics

Background:

  • Senile tremor is a common condition in older adults.
  • Its relationship to essential tremor is not fully understood.

Purpose of the Study:

  • To compare the characteristics of senile tremor with essential tremor.
  • To investigate if senile tremor is a subtype of essential tremor.

Main Methods:

  • Surface electromyography (EMG) was used to record muscle activity in patients with senile tremor and essential tremor.
  • Tremor frequency, discharge patterns, and response to mechanical perturbation were analyzed.
  • Control groups included elderly individuals without tremor and younger essential tremor patients.

Main Results:

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  • Senile tremor frequency (mean 6.2 Hz) was similar to elderly controls (mean 6.0 Hz) but lower than essential tremor (mean 7.3 Hz).
  • Tremor frequency correlated inversely with patient age in both senile and essential tremor groups.
  • Both senile and essential tremors responded to mechanical perturbation, with reciprocal antagonist muscle discharge observed.

Conclusions:

  • Senile tremor exhibits characteristics similar to essential tremor, particularly in older individuals.
  • The findings suggest senile tremor may represent a subtype of essential tremor.
  • Age appears to influence tremor frequency in both conditions.