Document Detail


Morphological analysis of force/velocity relationship in dynamic exercise at varying loads.
MedLine Citation:
PMID:  20634737     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
This study examined the force/velocity (F/V) curve morphology among the entire concentric phase of the countermovement squat (CMS). The hypothesis is that F/V curve shape of the lower limb muscles complex is different from F/V isolated muscle curve and that these analyses could be useful in characterizing athletes' muscular capacity and training programs. Squat exercise was performed by 29 subjects (15 men and 14 women, divided into resistance and endurance athletes). The protocol was 6 x 1 CMS at maximal speed with increasing loads: 20, 35, 50, 65, 80, 90% of 1 repetition maximum (1RM). Displacement, speed, and acceleration of the weight bar, joint knee angles, knee angular speed, and total and normalized forces were collected. F/V relation was obtained by force and velocity values of each 10 degrees angular interval of the concentric phase for any load. Results show that the F/V relationship does not follow a linear shape and an equivalent criterion for all loads. We observed a "second peak force" statistically higher (p < 0.05) than the inversion peak at 80 and 90% 1RM. Resistance trained men showed a "second peak" higher and larger than that shown by endurance trained men. This indicated a higher ability to produce and maintain greater force at higher relative speed. These results may be helpful to identify the muscle characteristics of the athletes at various speeds and joint positions. With a phase division of the specific move, it will be possible to determine an individualized program to monitor the specific phases of technical moves and to evaluate the training effect in long run.
Authors:
Eloisa Limonta; Massimiliano Sacchi
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Journal of strength and conditioning research / National Strength & Conditioning Association     Volume:  24     ISSN:  1533-4287     ISO Abbreviation:  J Strength Cond Res     Publication Date:  2010 Aug 
Date Detail:
Created Date:  2010-08-04     Completed Date:  2010-11-12     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9415084     Medline TA:  J Strength Cond Res     Country:  United States    
Other Details:
Languages:  eng     Pagination:  2065-72     Citation Subset:  IM    
Affiliation:
Department of Sport Sciences, Nutrition and Health, Statal University of Milan, Milan, Italy. eloisa.limonta@unimi.it
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MeSH Terms
Descriptor/Qualifier:
Adult
Female
Humans
Male
Muscle Strength / physiology
Myography
Physical Endurance / physiology
Resistance Training / methods*
Weight-Bearing / physiology
Young Adult

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


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