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Orthostatic tremor: report of two cases and an electrophysiological study
Author(s) -
Uncini A.,
Onofrj M.,
Basciani M.,
Cutarella R.,
Gambi D.
Publication year - 1989
Publication title -
acta neurologica scandinavica
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.967
H-Index - 95
eISSN - 1600-0404
pISSN - 0001-6314
DOI - 10.1111/j.1600-0404.1989.tb03722.x
Subject(s) - electrophysiology , medicine , physical medicine and rehabilitation , psychology , neuroscience , orthostatic vital signs , audiology , blood pressure
— Two patients with legs tremor present on standing, but none on walking or sitting, are reported. Tremor was not exclusive of orthostatism and was also evoked by strong tonic contraction of leg muscles. Synchronous EMG bursts were recorded in antagonistic muscle groups at 8‐10 Hz in the first patient and at 16 Hz in the second. EMG activity was synchronous in corresponding muscles of both legs. The occurrence of EMG activity was not influenced by stimulation of nerve afferent fibers. We suggest that this movement disorder may be an exaggeration of physiological tremor due to synchronization of motor units by spontaneous oscillations in central structures.