Document Detail


Evidence of motor equivalence in a pointing task involving locomotion.
MedLine Citation:
PMID:  11500574     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
A pointing task was performed both while subjects stood beside and while subjects walked past targets that involved differing movement amplitudes and differing sizes. The hand kinematics were considered relative both to a fixed frame of reference in the movement environment (end effector kinematics) and to the subject's body (kinematics of the hand alone). From the former view, there were few differences between standing and walking versions of the task, indicating similarity of the kinematics of the hand. However, when the hand was considered alone, marked differences in the kinematics and spatial trajectories between standing and walking were achieved. Furthermore, kinematic analyses of the trunk showed that subjects used differing amounts of both flexion-extension and rotation movements at the waist depending on whether they were standing or walking as well as on the constraints imposed by target width and movement amplitude. The present results demonstrate the existence of motor equivalence in a combined upper and lower extremity task and that this motor equivalence is a control strategy to cope with increasing task demands. Given the complexity involved in controlling the arm, the torso, and the legs (during locomotion), the movements involved in the present tasks appear to be planned and controlled by considering the whole body as a single unit.
Authors:
R G Marteniuk; C J Ivens; C P Bertram
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Motor control     Volume:  4     ISSN:  1087-1640     ISO Abbreviation:  Motor Control     Publication Date:  2000 Apr 
Date Detail:
Created Date:  2001-08-13     Completed Date:  2001-08-30     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  9706297     Medline TA:  Motor Control     Country:  United States    
Other Details:
Languages:  eng     Pagination:  165-84     Citation Subset:  IM    
Affiliation:
Faculty of Applied Sciences, Simon Fraser University, Burnaby, B.C. V5A 1S6, Canada.
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MeSH Terms
Descriptor/Qualifier:
Attention*
Biomechanics
Female
Humans
Male
Orientation*
Posture
Psychomotor Performance*
Reference Values
Walking*

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


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