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Inhibition of forearm EMG by palatal myoclonus
Author(s) -
Elble Rodger J.
Publication year - 1991
Publication title -
movement disorders
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.352
H-Index - 198
eISSN - 1531-8257
pISSN - 0885-3185
DOI - 10.1002/mds.870060410
Subject(s) - forearm , wrist , myoclonus , electromyography , medicine , ataxia , physical medicine and rehabilitation , cerebellar ataxia , psychology , anesthesia , anatomy , psychiatry
The forearm electromyogram (EMG), pharyngeal EMG, and wrist tremor were recorded simultaneously from a 74‐year‐old woman with the syndrome of palatal myoclonus and progressive ataxia. Her wrist tremor had the characteristics of enhanced physiologic tremor. The enhancement of her tremor was attributable to 50‐ to 80‐ms silent periods in the forearm EMG that followed the 1.9‐Hz bursts of palatal myoclonus by 50 to 60 ms. This observation and those of previous authors support the notion that rhythmic olivocerebellar discharges can cause tremorogenic excitation and inhibition of postural EMG activity in the upper extremities.