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Force Production Asymmetry in Male and Female Athletes of Differing Strength Levels.
MedLine Citation:
PMID:  25394294     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
The purpose of this investigation was to determine the existence of bilateral strength and force production asymmetry and evaluate possible differences based on sex as well as strength level. Asymmetry was assessed during weight distribution (WtD) testing, unloaded and lightly loaded static (SJ) and countermovement jump (CMJ) testing, and isometric mid-thigh pull (IMTP) strength testing. Subjects included 63 athletes (31 male, 32 female) for WtD, SJ and CMJ tests, while 129 athletes (64 male, 65 female) participated in IMTP testing. Independent samples t tests were used to determine possible differences in asymmetry magnitude between males and females as well as between strong and weak athletes. Cohen's d effect size estimates were also used to estimate difference magnitudes. SI score sStatistically different asymmetry levels with moderate to strong effect sizes were seen between males and females in WtD, 0 kg SJ (peak force; PF), 20 kg SJ (peak power; PP), 0 kg CMJ (PF, PP, net impulse), 20 kg CMJ (PF), but no statistical differences were observed in IMTP variables. Dividing the sample into strong and weak groups produced statistically significant differences with strong effect size estimates in IMTP PF and rate of force development and many effect sizes in jump symmetry variables increased. The results of this investigation indicate that females may be more prone to producing forces asymmetrically than males during WtD and jumping tasks. Similarly, weaker athletes displayed more asymmetry than stronger athletes. This may indicate that absolute strength may play a larger role in influencing asymmetry magnitude than sex.
Authors:
Christopher A Bailey; Kimitake Sato; Angus Burnett; Michael H Stone
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2014-11-13
Journal Detail:
Title:  International journal of sports physiology and performance     Volume:  -     ISSN:  1555-0265     ISO Abbreviation:  Int J Sports Physiol Perform     Publication Date:  2014 Nov 
Date Detail:
Created Date:  2014-11-13     Completed Date:  -     Revised Date:  2014-11-14    
Medline Journal Info:
Nlm Unique ID:  101276430     Medline TA:  Int J Sports Physiol Perform     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
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