Document Detail

Impaired sensory-motor integration during grasping in writer's cramp.
MedLine Citation:
PMID:  8800949     Owner:  NLM     Status:  MEDLINE    
Six subjects with writer's cramp and six healthy control subjects were examined while lifting a small instrumented object with variable weight and friction using the precision grip. The isometric grip and load forces were sampled at 400 Hz and stored in a flexible laboratory computer system for later analysis. Quantitative measurement of vibration and temperature sensibility showed normal sensory perception in the writer's cramp subjects. They exhibited an impaired programming of the grip-lift force co-ordination, while the ability to generate unimodal force-rate trajectories and to characterize the pattern of the force output according to memory representations of weight and friction of the object were intact. The capacity to terminate quickly the programmed grip force in lifts erroneously programmed too high was impaired. Writer's cramp subjects also employed excessive grip force during the static phase of the lift, and some patients had a short grip force latency after sudden unpredicted load increases, indicating a disinhibited spinal reflex response. The results indicate an impaired capacity in writer's cramp subjects to integrate sensory information in the motor programming and force regulation during precision grip tasks, despite a normal sensibility.
T Odergren; N Iwasaki; J Borg; H Forssberg
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Brain : a journal of neurology     Volume:  119 ( Pt 2)     ISSN:  0006-8950     ISO Abbreviation:  Brain     Publication Date:  1996 Apr 
Date Detail:
Created Date:  1996-10-01     Completed Date:  1996-10-01     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0372537     Medline TA:  Brain     Country:  ENGLAND    
Other Details:
Languages:  eng     Pagination:  569-83     Citation Subset:  AIM; IM    
Department of Neurology, Karolinska Hospital, Stockholm, Sweden.
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MeSH Terms
Dystonia / physiopathology*
Hand Strength / physiology
Muscle Cramp / physiopathology*

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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