Document Detail


Is power grasping contact continuous or discrete?
MedLine Citation:
PMID:  23271322     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
During power grasp, the number of local force maxima reflects either the central nervous system's preferential use of particular hand regions, or anatomical constraints, or both. Previously, both bimodal and trimodal force maxima have been hypothesized for power grasp of a cylindrical handle. Here we measure the number of local force maxima, with a resolution of 4.8°, when performing pushing and pulling efforts in the plane perpendicular to the cylinder's long axis. Twelve participants produced external forces to eight targets. The number of contacts was defined as the number of local maxima exceeding background variance. A minimum of four and a maximum of five discrete contacts were observed in all subjects at the distal phalanges and metacarpal heads. We thus reject previous hypotheses of bimodal or trimodal force control for cylindrical power grasping. Since we presently observed only 4-5 contacts, which is rather low considering the hand's kinematic flexibility in the flexion plane, we also reject hypotheses of continuous contact, which are inherent to current grasping taxonomy. A modification to current grasping taxonomy is proposed wherein power grasp contains separate branches for continuous and discrete contacts, and where power and precision grasps are distinguished only by grasp manipulability.
Authors:
Todd C Pataky; Greg P Slota; Mark L Latash; Vladimir M Zatsiorsky
Publication Detail:
Type:  Comparative Study; Journal Article; Research Support, N.I.H., Extramural; Research Support, Non-U.S. Gov't     Date:  2012-12-27
Journal Detail:
Title:  Journal of applied biomechanics     Volume:  29     ISSN:  1065-8483     ISO Abbreviation:  J Appl Biomech     Publication Date:  2013 Oct 
Date Detail:
Created Date:  2013-11-08     Completed Date:  2014-07-01     Revised Date:  2014-07-02    
Medline Journal Info:
Nlm Unique ID:  9315240     Medline TA:  J Appl Biomech     Country:  United States    
Other Details:
Languages:  eng     Pagination:  554-62     Citation Subset:  IM    
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MeSH Terms
Descriptor/Qualifier:
Adult
Fingers / physiology*
Hand Strength / physiology*
Humans
Male
Models, Biological*
Muscle Strength / physiology*
Psychomotor Performance / physiology*
Stress, Mechanical
Grant Support
ID/Acronym/Agency:
AR048563/AR/NIAMS NIH HHS; R01 AR048563/AR/NIAMS NIH HHS
Comments/Corrections

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