Document Detail


Adaptations to fatigue of a single digit violate the principle of superposition in a multi-finger static prehension task.
MedLine Citation:
PMID:  23322417     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
We investigated the effects of exercise-induced fatigue of a digit on the biomechanics of a static prehension task. The participants were divided into two groups. One group performed the fatiguing exercise using the thumb (group-thumb) and the second group performed the exercise using the index finger (group-index). We analyzed the prehensile action as being based on a two-level hierarchy. Our first hypothesis was that fatigue of the thumb would have stronger effects at the upper level (action shared between the thumb and all four fingers combined-virtual finger) and fatigue of the index finger would have stronger effects at the lower level of the hierarchy (action of the virtual finger shared among actual fingers). We also hypothesized that fatigue would cause a decrease in the normal force applied by the exercised digit and correspondingly lead to a decrease in the normal force applied by the opposing digit(s). Our third hypothesis was that fatigue would leave the tangential forces unaffected. Fatigue led to a significant drop in the normal force of both exercised and non-exercised (opposing) digits. The tangential forces of the exercised digits increased after fatigue. This led to a drop in the safety margin in the group-thumb, but not group-index. As such, the results supported the first two hypotheses but not the third hypothesis. Overall, the results suggested that fatigue triggered a chain reaction that involved both forces and moments of force produced by individual digits leading to a violation of the principle of superposition. The findings are interpreted within the framework of the referent configuration hypothesis.
Authors:
Tarkeshwar Singh; Vladimir M Zatsiorsky; Mark L Latash
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Publication Detail:
Type:  Journal Article; Research Support, N.I.H., Extramural     Date:  2013-01-16
Journal Detail:
Title:  Experimental brain research     Volume:  225     ISSN:  1432-1106     ISO Abbreviation:  Exp Brain Res     Publication Date:  2013 Apr 
Date Detail:
Created Date:  2013-03-12     Completed Date:  2013-08-26     Revised Date:  2014-04-02    
Medline Journal Info:
Nlm Unique ID:  0043312     Medline TA:  Exp Brain Res     Country:  Germany    
Other Details:
Languages:  eng     Pagination:  589-602     Citation Subset:  IM    
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MeSH Terms
Descriptor/Qualifier:
Adult
Biomechanical Phenomena / physiology
Female
Fingers / physiology*
Hand Strength
Humans
Male
Motor Skills / physiology*
Movement / physiology*
Muscle Fatigue / physiology*
Grant Support
ID/Acronym/Agency:
AG-018751/AG/NIA NIH HHS; AR-048563/AR/NIAMS NIH HHS; NS-035032/NS/NINDS NIH HHS; R01 AG018751/AG/NIA NIH HHS; R01 AR048563/AR/NIAMS NIH HHS; R01 NS035032/NS/NINDS NIH HHS
Comments/Corrections

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