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Ann Clin Neurophysiol. 1999; 1(2): 270-285.
The Classification and Electrophysiological Evaluation of Tremor
Man-Wook Seo
Copyright © 1999 The Korean Society of Clinical Neurophysiology
This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/4.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
ABSTRACT
Tremor is an approximately rhythmic, roughly sinusoidal involuntary movement. Despite nearly a century of modern clinical and laboratory investigations, no tremor is understood completely. Human tremors derive from different etiologies and thus, not suprisingly, the physiologies are diverse. Tremors may derive from mechanical oscillations, mechanical reflex oscillations, normal central oscillators, and pathologic central oscillators. However the definitive identification of oscillators for any tremor have not yet been established. Measuring tremor clinically is difficult because tremors behave in different and often complex ways. There are several different techniques for measuring tremor. One of most popular and sensitive methods use accelerometries. An excellent method consists of accelerometry and EMG combined with spectral analysis and weighting of the body part, which allows separation of tremors coming from mechanical reflex and central oscillators. Now times, increased power and speed of microprocessors enable clinical laboratories to quantify tremor and other aspects of motor disability with accuracy and precision not possible a decade ago.
Key words: Tremor, Pathophysiologic mechanisms, Electrophysiological tests
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