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Department of Medicine, Division of Neurology, Southern Illinois University School of Medicine, Springfield, IL.
We studied physiologic and essential hand tremor using inertial loading; hand acceleration and forearm EMG data were analyzed by auto- and cross-spectral analysis. Early essential tremor was qualitatively similar to the 8- to 12-Hz component of physiologic tremor, suggesting that this tremor component is a forme fruste of essential tremor. Advanced essential tremor had a frequency of 4 to 8 Hz. Patients with tremor frequencies in both ranges were observed in each of 10 families. In antagonistic forearm muscles, both synchronous and alternating tremor bursts were observed in 11 of 44 patients. Essential tremor should not be classified solely on the basis of frequency or EMG pattern.
Address correspondence and reprint requests to Dr. Elble, Department of Medicine, Division of Neurology, Southern Illinois University School of Medicine, P.O. Box 3926, Springfield, IL 62708.
Supported by grants from the National Institute of Neurological and Communicative Disorders and Stroke (R01-NS20973) and from the American Parkinson Disease Association.
Presented in part at the thirty-sixth and thirty-seventh annual meetings of the American Academy of Neurology, Boston, MA, April 1984 and Dallas, TX, April 1985.
Accepted for publication June 4, 1985.
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