Document Detail

Positive work as a function of eccentric load in maximal leg extension movements.
MedLine Citation:
PMID:  3769913     Owner:  NLM     Status:  MEDLINE    
Negative and positive work performed during leg extension movements of 53 well trained subjects was measured with the help of a special dynamometer. The subjects performed four maximal push off trials against five different loads (25-105 kg): two two-legged extensions from a squatting position (SM) with a knee angle of 70 degrees and two trials with a preliminary counter movement (CM) but with the same extension range as in the SM. Positive work differed only by about 4% between CM and SM in spite of large differences in initial forces at the onset of concentric contraction. Based on simulations, it is suggested that in CM the advantage of stored elastic energy can almost completely be nullified by the disadvantage of a limited shortening distance of the contractile elements. It is hypothesised that elastic energy in CM can only cause considerable extra work during concentric contraction compared to the maximal positive work done in SM if the total range of lengthening and shortening of the muscle(s) involved is larger in CM than in SM.
F J Avis; H M Toussaint; P A Huijing; G J van Ingen Schenau
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  European journal of applied physiology and occupational physiology     Volume:  55     ISSN:  0301-5548     ISO Abbreviation:  Eur J Appl Physiol Occup Physiol     Publication Date:  1986  
Date Detail:
Created Date:  1986-11-25     Completed Date:  1986-11-25     Revised Date:  2004-11-17    
Medline Journal Info:
Nlm Unique ID:  0410266     Medline TA:  Eur J Appl Physiol Occup Physiol     Country:  GERMANY, WEST    
Other Details:
Languages:  eng     Pagination:  562-8     Citation Subset:  IM; S    
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MeSH Terms
Energy Metabolism
Muscle Contraction
Muscles / metabolism,  physiology*
Time Factors

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

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