Document Detail

Damping of the wrist joint during voluntary movement.
MedLine Citation:
PMID:  9808304     Owner:  NLM     Status:  MEDLINE    
Damping characteristics of the musculoskeletal system were investigated during rapid voluntary wrist flexion movements. Oscillations about the final position were induced by introducing a load with the characteristics of negative damping, which artificially reduced the damping of the wrist. Subjects responded to increases in the negatively damped load by stronger cocontraction of wrist flexor and extensor muscles during the stabilization phase of the movement. However, their ability to counteract the effects of the negatively damped load diminished as the negative damping increased. Consequently, the number and frequency of oscillations increased. The oscillations were accompanied by phase-locked muscle activity superimposed on underlying tonic muscle activation. The wrist stiffness and damping coefficient increased with the increased cocontraction that accompanied more negatively damped loads, although changes in the damping coefficient were less systematic than the stiffness. Analysis of successive half-cycles of the oscillation revealed that the wrist stiffness and damping coefficient increased, despite decreasing muscle activation, as oscillation amplitude and velocity declined. This indicates that the inverse dependence of the damping coefficient on oscillation velocity contributes significantly to damping of joint motion. It is suggested that this property helps to offset a negative contribution to damping from the stretch reflex.
T E Milner; C Cloutier
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Experimental brain research     Volume:  122     ISSN:  0014-4819     ISO Abbreviation:  Exp Brain Res     Publication Date:  1998 Oct 
Date Detail:
Created Date:  1999-01-08     Completed Date:  1999-01-08     Revised Date:  2013-12-13    
Medline Journal Info:
Nlm Unique ID:  0043312     Medline TA:  Exp Brain Res     Country:  GERMANY    
Other Details:
Languages:  eng     Pagination:  309-17     Citation Subset:  IM; S    
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MeSH Terms
Electric Impedance
Movement / physiology*
Muscle Contraction / physiology
Muscle, Skeletal / physiology
Reflex / physiology
Volition / physiology*
Wrist Joint / physiology*

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