Document Detail

Bimanual coordination: constraints imposed by the relative timing of homologous muscle activation.
MedLine Citation:
PMID:  14689135     Owner:  NLM     Status:  MEDLINE    
It has often been supposed that patterns of rhythmic bimanual coordination in which homologous muscles are engaged simultaneously, are performed in a more stable manner than those in which the same muscles are activated in an alternating fashion. In order to assess the efficacy of this constraint, the present study investigated the effect of forearm posture (prone or supine) on bimanual abduction-adduction movements of the wrist in isodirectional and non-isodirectional modes of coordination. Irrespective of forearm posture, non-isodirectional coordination was observed to be more stable than isodirectional coordination. In the latter condition, there was a more severe deterioration of coordination accuracy/stability as a function of cycling frequency than in the former condition. With elevations in cycling frequency, the performers recruited extra mechanical degrees of freedom, principally via flexion-extension of the wrist, which gave rise to increasing motion in the vertical plane. The increases in movement amplitude in the vertical plane were accompanied by decreasing amplitude in the horizontal plane. In agreement with previous studies, the present findings confirm that the relative timing of homologous muscle activation acts as a principal constraint upon the stability of interlimb coordination. Furthermore, it is argued that the use of manipulations of limb posture to investigate the role of other classes of constraint (e.g. perceptual) should be approached with caution because such manipulations affect the mapping between muscle activation patterns, movement dynamics and kinematics.
Yong Li; Oron Levin; Richard G Carson; Stephan P Swinnen
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2003-12-19
Journal Detail:
Title:  Experimental brain research     Volume:  156     ISSN:  0014-4819     ISO Abbreviation:  Exp Brain Res     Publication Date:  2004 May 
Date Detail:
Created Date:  2004-04-20     Completed Date:  2004-06-04     Revised Date:  2013-12-13    
Medline Journal Info:
Nlm Unique ID:  0043312     Medline TA:  Exp Brain Res     Country:  Germany    
Other Details:
Languages:  eng     Pagination:  27-38     Citation Subset:  IM    
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MeSH Terms
Hand / physiology*
Movement / physiology
Muscle Contraction / physiology*
Muscle, Skeletal / physiology*
Posture / physiology
Psychomotor Performance / physiology*
Reference Values
Time Factors

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

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