Document Detail

Influence of a horizontal approach on the mechanical output during drop jumps.
MedLine Citation:
PMID:  18431945     Owner:  NLM     Status:  MEDLINE    
This study investigated the influence of a horizontal approach to mechanical output during drop jumps. Participants performed drop jumps from heights of 15, 30, 45, and 60 cm with zero, one, two, and three approach steps. The peak summed power during the push-off phase changed quadratically across heights (6.2 +/- 0.3, 6.7 +/- 0.4, 6.4 +/- 0.4, and 6.0 +/- 0.4 kW, respectively) driven by the ankle joint response. Summed peak power was 10% greater with an approach attributed to the knee joint response. Downward phase dorsiflexion (31%), knee flexion (35%), and peak vertical force (32%) increased with drop heights. Vertical approach force (22%) increased, while knee flexion (11%) and downward duration (17%) decreased. An approach may improve drop jump training for explosive tasks.
Mianfang Ruan; Li Li
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Research quarterly for exercise and sport     Volume:  79     ISSN:  0270-1367     ISO Abbreviation:  Res Q Exerc Sport     Publication Date:  2008 Mar 
Date Detail:
Created Date:  2008-04-24     Completed Date:  2008-07-10     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8006373     Medline TA:  Res Q Exerc Sport     Country:  United States    
Other Details:
Languages:  eng     Pagination:  1-9     Citation Subset:  IM    
Department of Kinesiology at Louisiana State University, Baton Rouge, LA 70803, USA.
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MeSH Terms
Ankle Joint / physiology
Hip Joint / physiology
Joints / physiology*
Knee Joint / physiology
Leg / physiology*
Muscle, Skeletal / physiology*
Sports / physiology*

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