Fourier power spectra of normal MR tremor (mechanical), enhanced physiological tremor due to thyrotoxicosis (enhanced) and physiological tremor with a.

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Fourier power spectra of normal MR tremor (mechanical), enhanced physiological tremor due to thyrotoxicosis (enhanced) and physiological tremor with a prominent 8–12-Hz component (8–12 Hz). Postural hand tremor was recorded a miniature accelerometer (blue lines), and rectified-filtered EMG of the extensor carpi radialis brevis was recorded with skin electrodes (red lines). Note how a 500-g load on the hand reduced normal and enhanced MR tremor. By contrast, the 8–12-Hz tremor increased in amplitude, but its frequency did not change. Source: Chapter 27. Pathophysiology of Tremor, Movement Disorders, 3e Citation: Watts RL, Standaert DG, Obeso JA. Movement Disorders, 3e; 2012 Available at: http://neurology.mhmedical.com/DownloadImage.aspx?image=/data/Books/watt/watt_c027f001.gif&sec=40659614&BookID=477&ChapterSecID=40656099&imagename= Accessed: October 08, 2017 Copyright © 2017 McGraw-Hill Education. All rights reserved