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EMG–EMG coherence in writer's cramp
Author(s) -
Cordivari Carla,
Lees Andrew J.,
Misra V. Peter,
Brown Peter
Publication year - 2002
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.10212
Subject(s) - physical medicine and rehabilitation , coherence (philosophical gambling strategy) , psychology , electromyography , medicine , mathematics , statistics
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