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EMG–EMG coherence in writer's cramp

✍ Scribed by Carla Cordivari; Andrew J. Lees; V. Peter Misra; Peter Brown

Publisher
John Wiley and Sons
Year
2002
Tongue
English
Weight
164 KB
Volume
17
Category
Article
ISSN
0885-3185

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✦ Synopsis

Abstract

We investigated the extent to which oscillatory drives to muscle, believed to arise mainly from the motor cortex, are exaggerated and/or fail to react normally to peripheral stimulation in writer's cramp. We used the coherence between active forearm flexor and intrinsic hand muscles as our index of such drives before and after digital nerve stimulation of the dominant hand. The results in 8 patients with writer's cramp were compared with those in eight age‐ and sex‐matched healthy subjects. We found no significant difference in either the strength of intermuscular coherence or its modulation by cutaneous stimulation between patients and healthy subjects during voluntary flexion of the wrist and extension–abduction of the fingers. Therefore, we were unable to provide evidence for a pervasive disturbance of oscillatory cortical motor outflow in writer's cramp. © 2002 Movement Disorder Society

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