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Physiologic Hand Tremor

Physiologic Hand Tremor Abstract To the Editor.— In their study of normal hand tremor (Archives 1982;39:358-362), Wade et al describe an 8- to 12-Hz "shoulder" in their hand tremor spectra and suggest that this component is neurogenic, citing my work with Randall.1 In citing that work, they comment that the 8- to 12-Hz component is somehow related to the recruitment rates of individual motor units. However, Randall and I specifically demonstrated that much more is involved. In particular, motor units firing at mean frequencies of 10 to 22 spikes/s are involved, and, regardless of the mean firing frequency, the firing pattern of each motor unit is modulated at 8 to 12 Hz.1 The synchronous 8- to 12-Hz modulation of neighboring motor units is then responsible for the 8- to 12-Hz component of hand tremor2 and finger tremor.1 As Wade et al have noted, the amplitude of the 8- to 12-Hz component References 1. Elble RJ, Randall JE: Motor-unit activity responsible for the 8 to 12 Hz component of human physiologic finger tremor . J Neurophysiol 1976;39:370-383. 2. Elble RJ, Randall JE: Mechanistic components of normal hand tremor . Electroencephalogr Clin Neurophysiol 1978;44:72-82.Crossref 3. Allum JHJ, Dietz V, Freund HJ: Neuronal mechanisms underlying physiologic tremor . J Neurophysiol 1978;41:557-571. 4. Stiles RN: Frequency and displacement amplitude relations for normal hand tremor . J Appl Physiol 1976;40:44-54. 5. Fox JR, Randall JE: Relationship between forearm tremor and the biceps electromyogram . J Appl Physiol 1970;29:103-108. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Archives of Neurology American Medical Association

Physiologic Hand Tremor

Archives of Neurology , Volume 39 (11) – Nov 1, 1982

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References (5)

Publisher
American Medical Association
Copyright
Copyright © 1982 American Medical Association. All Rights Reserved.
ISSN
0003-9942
eISSN
1538-3687
DOI
10.1001/archneur.1982.00510230063023
Publisher site
See Article on Publisher Site

Abstract

Abstract To the Editor.— In their study of normal hand tremor (Archives 1982;39:358-362), Wade et al describe an 8- to 12-Hz "shoulder" in their hand tremor spectra and suggest that this component is neurogenic, citing my work with Randall.1 In citing that work, they comment that the 8- to 12-Hz component is somehow related to the recruitment rates of individual motor units. However, Randall and I specifically demonstrated that much more is involved. In particular, motor units firing at mean frequencies of 10 to 22 spikes/s are involved, and, regardless of the mean firing frequency, the firing pattern of each motor unit is modulated at 8 to 12 Hz.1 The synchronous 8- to 12-Hz modulation of neighboring motor units is then responsible for the 8- to 12-Hz component of hand tremor2 and finger tremor.1 As Wade et al have noted, the amplitude of the 8- to 12-Hz component References 1. Elble RJ, Randall JE: Motor-unit activity responsible for the 8 to 12 Hz component of human physiologic finger tremor . J Neurophysiol 1976;39:370-383. 2. Elble RJ, Randall JE: Mechanistic components of normal hand tremor . Electroencephalogr Clin Neurophysiol 1978;44:72-82.Crossref 3. Allum JHJ, Dietz V, Freund HJ: Neuronal mechanisms underlying physiologic tremor . J Neurophysiol 1978;41:557-571. 4. Stiles RN: Frequency and displacement amplitude relations for normal hand tremor . J Appl Physiol 1976;40:44-54. 5. Fox JR, Randall JE: Relationship between forearm tremor and the biceps electromyogram . J Appl Physiol 1970;29:103-108.

Journal

Archives of NeurologyAmerican Medical Association

Published: Nov 1, 1982

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