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Syndromes of continuous muscle fi bre activity 

Syndromes of continuous muscle fi bre activity

Ivan Donaldson

, C. David Marsden

, Susanne A. Schneider

, and Kailash P. Bhatia

Page of

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date: 18 May 2022

This group of disorders is characterized by continuous electrical activity and contraction of muscle fibres, which persist even on attempted relaxation. They differ from dystonia in that the latter condition shows more spontaneous fluctuation in muscle activity, with periods of relaxation in which there is electromyographic (EMG) silence. In addition, the tendency to involuntary movements is greater in dystonia. Myotonia is distinguished by the absence of continuous muscle activity during relaxation.

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