Document Detail

Effect of arm swing direction on forward and backward jump performance.
MedLine Citation:
PMID:  18752799     Owner:  NLM     Status:  MEDLINE    
This study quantified and compared how the directional differences in arm swing affected mechanical and physiological parameters during forward and backward jumping. Seven subjects maximally performed three types of forward and backward squat jumps-no arm swing (FJ, BJ), forward arm swing (FJF, BJF), and backward arm swing (FJB, BJB) from a force platform. All performances were captured with a 3-D motion capture system. Electromyograms (EMGs) of the lower extremity muscles were obtained. Variables were calculated by combining kinematic and kinetic data. The jump displacement and center of mass velocity at take-off were significantly larger in FJF than in FJ or FJB and larger in BJB than in BJ or BJF, suggesting that the best performance was obtained by employing the same arm swing direction as a given jump direction. The total work by three lower and two upper extremity joints was significantly larger in FJF than in FJ or FJB and larger in BJB than in BJ or BJF. For the lower extremity joints, hip work was the greatest in FJF and BJB. The integrated EMG of the biceps femoris when the hip power was produced was significantly larger in FJF and BJB than under other conditions. These results suggest that if the arm swing direction is the same as a given jump direction, the activation level of the hip extensor is greater to counter large loads which make the hip joint flex during the push-off phase, which result in increased hip extension torque, power, and work.
Mikiko Hara; Akira Shibayama; Hiroshi Arakawa; Senshi Fukashiro
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Publication Detail:
Type:  Journal Article     Date:  2008-08-26
Journal Detail:
Title:  Journal of biomechanics     Volume:  41     ISSN:  0021-9290     ISO Abbreviation:  J Biomech     Publication Date:  2008 Sep 
Date Detail:
Created Date:  2008-09-15     Completed Date:  2009-02-25     Revised Date:  2009-11-11    
Medline Journal Info:
Nlm Unique ID:  0157375     Medline TA:  J Biomech     Country:  United States    
Other Details:
Languages:  eng     Pagination:  2806-15     Citation Subset:  IM    
Department of Sports Sciences, Japan Institute of Sports Sciences, 3-15-1 Nishigaoka, Kita-ku, Tokyo 115-0056, Japan.
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MeSH Terms
Ankle Joint / physiology
Arm / physiology*
Biomechanics / physiology*
Elbow Joint / physiology
Joints / physiology*
Knee Joint / physiology
Motor Activity / physiology*
Movement / physiology*
Shoulder Joint / physiology

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

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