Document Detail


The pull in olympic weightlifting.
MedLine Citation:
PMID:  491869     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Data from five experienced weightlifters on the vertical forces applied to the barbell and system (barbell and lifter) during the pull were in excellent agreement with earlier displacement-time descriptions of the double knee bend as consisting of two stages of extension interrupted by a period of realignment (second knee bend). The vertical component of the ground reaction force (Rz) consisted of three phases: Weighting I, Unweighting, and Weighting II. The relative magnitude of the Rz impulse with respect to the system weight impulse (as an indicant of the proportion of the Rz impulse contributing to system acceleration) ranged from 118--141% for Weighting I, 74--89% for Unweighting, and 122--135% for Weighting II. In agreement with published theoretical calculations the most experienced and successful lifter produced the larger phase of positive acceleration first. The rebending of the knees was associated with the Unweighting phase. Although this latter interval corresponded to a phase of barbell deceleration, it appeared that the concomitant enhancement of the back, hip, and knee extensor activity outweighed any adverse effects.
Authors:
R M Enoka
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Publication Detail:
Type:  Journal Article; Research Support, U.S. Gov't, P.H.S.    
Journal Detail:
Title:  Medicine and science in sports     Volume:  11     ISSN:  0025-7990     ISO Abbreviation:  Med Sci Sports     Publication Date:  1979  
Date Detail:
Created Date:  1979-12-20     Completed Date:  1979-12-20     Revised Date:  2008-11-21    
Medline Journal Info:
Nlm Unique ID:  0203246     Medline TA:  Med Sci Sports     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  131-7     Citation Subset:  IM    
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MeSH Terms
Descriptor/Qualifier:
Biomechanics
Humans
Knee / physiology
Male
Physical Exertion*
Sports*
Weight Lifting*

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


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