Document Detail


The effects of isokinetic contraction velocity on concentric and eccentric strength of the biceps brachii.
MedLine Citation:
PMID:  16686569     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
The purpose of this investigation was to determine the influence of contraction velocity on the eccentric (ECC) and concentric (CON) torque production of the biceps brachii. After performing warm-up procedures, each male subject (n = 11) completed 3 sets of 5 maximal bilateral CON and ECC isokinetic contractions of the biceps at speeds of 90, 180, and 300 degrees x s(-1) on a Biodex System 3 dynamometer. The men received a 3-minute rest between sets and the order of exercises was randomized. Peak torque (Nm) values were obtained for CON and ECC contractions at each speed. Peak torque scores (ECC vs. CON) were compared using a t-test at each speed. A repeated measures analysis of variance was used to determine differences between speeds. ECC peak torque scores were greater than CON peak torque scores at each given speed: 90 degrees x s(-1), p = 0.0001; 180 degrees x s(-1), p = 0.0001; and 300 degrees x s(-1), p = 0.0001. No differences were found between the ECC peak torque scores (p = 0.62) at any of the speeds. Differences were found among the CON scores (p = 0.004). Post hoc analysis revealed differences between 90 degrees x s(-1) (114.61 +/- 23) and 300 degrees x s(-1) (94.17 +/- 18). These data suggest that ECC contractions of the biceps brachii were somewhat resistant to a force decrement as the result of an increase in velocity, whereas CON muscular actions of the biceps brachii were unable to maintain force as velocity increased.
Authors:
Daniel G Drury; Kristin J Stuempfle; Clifford W Mason; Julia C Girman
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Journal of strength and conditioning research / National Strength & Conditioning Association     Volume:  20     ISSN:  1064-8011     ISO Abbreviation:  J Strength Cond Res     Publication Date:  2006 May 
Date Detail:
Created Date:  2006-05-11     Completed Date:  2006-11-09     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  9415084     Medline TA:  J Strength Cond Res     Country:  United States    
Other Details:
Languages:  eng     Pagination:  390-5     Citation Subset:  IM; S    
Affiliation:
Human Performance Laboratory, Gettysburg College, Gettysburg, Pennsylvania 17325, USA. ddrury@gettysburg.edu
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MeSH Terms
Descriptor/Qualifier:
Adult
Analysis of Variance
Arm / physiology*
Humans
Male
Muscle Contraction / physiology*
Muscle, Skeletal / physiology*
Torque
Weight Lifting / physiology*

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


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