Document Detail

Effects of drop jumps added to the warm-up of elite sport athletes with a high capacity for explosive force development.
MedLine Citation:
PMID:  17530974     Owner:  NLM     Status:  MEDLINE    
The purpose of this study was to evaluate the immediate influence of eccentric muscle action on vertical jump performance in athletes performing sports with a high demand of explosive force development. In this randomized, controlled crossover trial, 13 Swiss elite athletes (national team members in ski jump, ski alpine, snowboard freestyle and alpine, ski freestyle, and gymnastics) with a mean age of 22 years (range 20-28) were randomized into 2 groups. After a semistandardized warm-up, group 1 did 5 jumps from a height of 60 cm, landing with active stabilization in 90 degrees knee flexion. One minute after these modified drop jumps, they performed 3 single squat jumps (SJ) and 3 single countermovement jumps (CMJ) on a force platform. The athletes repeated the procedure after 1 hour without the modified drop jumps. In a crossover manner, group 2 did the first warm-up without and the second warm-up with the modified drop jumps. Differences of the performance (jump height and maximal power) between the different warm-ups were the main outcomes. The mean absolute power and absolute height (without drop jumps) were CMJ 54.9 (SD = 4.1), SJ 55.0 (SD = 5.1), CMJ 44.1 cm (SD = 4.1), and SJ 40.8 cm (SD = 4.1). A consistent tendency for improvement with added drop jumps to the warm-up routine was observed compared with warm-up without drop jumps: maximal power CMJ +1.02 (95% confidence interval [CI] = +0.03 to +2.38), p = 0.045; maximal power SJ +0.8 (95% CI = -0.34 to +2.02), p = 0.148; jump height CMJ +0.48 cm (95% CI = -0.26 to +1.2), p = 0.182; SJ +0.73 cm (95% CI = -0.36 to +1.18), p = 0.169. Athletes could add modified drop jumps to the warm-up before competitions to improve explosive force development.
Roger Hilfiker; Klaus Hübner; Tobias Lorenz; Bernard Marti
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Publication Detail:
Type:  Journal Article; Randomized Controlled Trial    
Journal Detail:
Title:  Journal of strength and conditioning research / National Strength & Conditioning Association     Volume:  21     ISSN:  1064-8011     ISO Abbreviation:  J Strength Cond Res     Publication Date:  2007 May 
Date Detail:
Created Date:  2007-05-28     Completed Date:  2007-07-31     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9415084     Medline TA:  J Strength Cond Res     Country:  United States    
Other Details:
Languages:  eng     Pagination:  550-5     Citation Subset:  IM; S    
University of Applied Sciences Valais, Domain Health and Social Work, Leukerbad, Switzerland.
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MeSH Terms
Analysis of Variance
Cross-Over Studies
Gymnastics / physiology*
Leg / physiology
Muscle, Skeletal / physiology*
Physical Education and Training / methods*
Snow Sports / physiology*
Task Performance and Analysis

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