Selectivity of voluntary finger flexion during ischemic nerve block of the hand
Identifieur interne : 000377 ( Ncbi/Merge ); précédent : 000376; suivant : 000378Selectivity of voluntary finger flexion during ischemic nerve block of the hand
Auteurs : Karen T. Reilly [France] ; Marc H. Schieber [États-Unis] ; Penelope A. Mcnulty [Australie]Source :
- Experimental brain research. Experimentelle Hirnforschung. Experimentation cerebrale [ 0014-4819 ] ; 2008.
Abstract
During ischemic nerve block of an extremity, the cortical representations of muscles proximal to the block are known to expand, increasing the overlap of different muscle representations. Such reorganization mimics that seen in actual amputees. We investigated whether such changes degrade voluntary control of muscles proximal to the block. Nine subjects produced brief, isometric flexion force selectively with each fingertip before, during, and after ischemic block at the wrist. We recorded the isometric force exerted at the distal phalanx of each digit, along with electromyographic (EMG) activity from intrinsic and extrinsic finger muscles. Despite paralysis of the intrinsic hand muscles, and associated decrements in the flexion forces exerted by the thumb, index, and little fingers, the selectivity of voluntary finger flexion forces and of EMG activity in the extrinsic finger muscles that generated these forces remained unchanged. Our observations indicate that during ischemic nerve block, reorganization does not eliminate or degrade motor representations of the temporarily deafferented and paralyzed fingers.
Url:
DOI: 10.1007/s00221-008-1368-y
PubMed: 18431564
PubMed Central: 2712613
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<author-notes><corresp id="FN1">Correspondence to: Dr. Karen Reilly, Centre for Cognitive Neuroscience, CNRS, 67 boulevard Pinel, Bron 69675, FRANCE, <email>kreilly@isc.cnrs.fr</email>
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<abstract><p id="P1">During ischemic nerve block of an extremity, the cortical representations of muscles proximal to the block are known to expand, increasing the overlap of different muscle representations. Such reorganization mimics that seen in actual amputees. We investigated whether such changes degrade voluntary control of muscles proximal to the block. Nine subjects produced brief, isometric flexion force selectively with each fingertip before, during, and after ischemic block at the wrist. We recorded the isometric force exerted at the distal phalanx of each digit, along with electromyographic (EMG) activity from intrinsic and extrinsic finger muscles. Despite paralysis of the intrinsic hand muscles, and associated decrements in the flexion forces exerted by the thumb, index, and little fingers, the selectivity of voluntary finger flexion forces and of EMG activity in the extrinsic finger muscles that generated these forces remained unchanged. Our observations indicate that during ischemic nerve block, reorganization does not eliminate or degrade motor representations of the temporarily deafferented and paralyzed fingers.</p>
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