Document Detail


Have we underestimated the kinematic and kinetic benefits of non-ballistic motion?
MedLine Citation:
PMID:  18972886     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Explosive upper-body movements, with which the load is not thrown (non-ballistic), may comprise a phase during which forces are produced in opposition to the motion of the load. Thirty men completed three test sessions (free weight, ballistic, and pneumatic), each consisting of a one-repetition maximum (1-RM) and four explosive repetitions of a bench press at six loads (15, 30, 45, 60, 75, and 90% 1-RM). The end of the lifting phase for the non-ballistic conditions (free weight and pneumatic) was defined by: the point of peak barbell displacement and the point at which the vertical force became negative (positive work). When analysed by peak displacement, the ballistic condition elicited significantly greater mean velocity, force, and power at loads of 15-60% 1-RM compared with the free weight condition. When the period of negative work was removed, the mean free weight velocity, force, and power at loads below 60% 1-RM increased. Consequently, the only differences between the free weight and ballistic conditions were found at loads of 15% and 30% 1-RM. Including a period of negative work may underestimate all kinematic and kinetic variables dependent on the time to, or position of, the end of the lifting phase, for non-ballistic efforts.
Authors:
David M Frost; John B Cronin; Robert U Newton
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Sports biomechanics / International Society of Biomechanics in Sports     Volume:  7     ISSN:  1476-3141     ISO Abbreviation:  Sports Biomech     Publication Date:  2008 Sep 
Date Detail:
Created Date:  2008-10-31     Completed Date:  2009-01-14     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  101151352     Medline TA:  Sports Biomech     Country:  Scotland    
Other Details:
Languages:  eng     Pagination:  372-85     Citation Subset:  IM    
Affiliation:
School of Exercise, Biomedical and Health Sciences, Edith Cowan University, Joondalup, WA, Australia. d3frost@uwaterloo.ca
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MeSH Terms
Descriptor/Qualifier:
Biomechanics
Computer Simulation
Humans
Lifting*
Male
Models, Biological*
Motor Skills / physiology*
Movement / physiology*
Physical Endurance / physiology*
Physical Exertion / physiology*
Task Performance and Analysis*
Weight-Bearing / physiology*
Young Adult

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


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