Document Detail

Prehension Synergy: Use of Mechanical Advantage During Multi-Finger Torque Production on Mechanically Fixed- and Free Objects.
MedLine Citation:
PMID:  21975353     Owner:  NLM     Status:  Publisher    
The aim of this study was to test the mechanical advantage (MA) hypothesis in multi-finger torque production tasks in humans: fingers with longer moment arms produce greater force magnitudes during torque production tasks. There were eight experimental conditions: two prehension types determined by different mechanical constraints (i.e., fixed- and free-object prehension) with two torque directions (i.e., supination and pronation) and two torque magnitudes (i.e., 0.24 and 0.48 Nm). The subjects were asked to produce prescribed torques during the fixed-object prehension or to maintain constant position of the free hand-held object against external torques. The index of MA was calculated for agonist and antagonist fingers, which produce torques in the same and opposite directions to the target torques, respectively. Within agonist fingers, the fingers with longer moment arms produced greater grasping forces while within antagonist fingers, the fingers with shorter moment arms produced greater forces. The MA index was greater in the fixed-object condition as compared to the free-object condition. The MA index was greater in the pronation condition than the supination condition. This study supports the idea that the CNS utilizes the MA of agonist fingers, but not of antagonist fingers, during torque production in both fixed- and free-object conditions.
Jaebum Park; Brian S Baum; You-Sin Kim; Yoon Hyuk Kim; Jae Kun Shim
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2011-10-4
Journal Detail:
Title:  Journal of applied biomechanics     Volume:  -     ISSN:  1065-8483     ISO Abbreviation:  -     Publication Date:  2011 Oct 
Date Detail:
Created Date:  2011-10-6     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9315240     Medline TA:  J Appl Biomech     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Department of Kinesiology, University of Maryland, College Park, MD.
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