NDLI: Hip and knee extensor moments predict vertical jump height in adolescent girls.

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Ford, Kevin R. Myer, Gregory D. Brent, Jensen L. Hewett, Timothy E.
Description	Country affiliation: United States Author Affiliation: Ford KR ( Human Performance Laboratory, Sports Medicine Biodynamics Center, Cincinnati Children's Hospital Medical Center, Cincinnati, Ohio, USA. kevin.ford@chmcc.org)
Abstract	Biomechanical factors, such as hip and knee extensor moments, related to drop jump (DJ) performance have not been investigated in adolescent girls. The purpose of this study was to determine the key independent biomechanical variables that predict overall vertical jump performance in adolescent girls. Sixteen high school adolescent girls from club-sponsored and high school-sponsored volleyball teams performed DJ at 3 different drop heights (15, 30, and 45 cm). A motion analysis system consisting of 10 digital cameras and a force platform was used to calculate vertical jump height, joint angles, and joint moments during the tasks. A multiple linear regression was used to determine the biomechanical parameters that were best predictive of vertical jump height at each box drop distance. The 2 predictor variables in all 3 models were knee and hip extensor moments. The models predicted 82.9, 81.9, and 88% of the vertical jump height variance in the 15, 30, and 45 cm trials, respectively. The results of the investigation indicate that knee and hip joint moments are the main contributors to vertical jump height during the DJ in adolescent girls. Strength and conditioning specialists attempting to improve vertical jump performance should target power and strength training to the hip and knee extensors in their athletes.
File Format	HTM / HTML
ISSN	10648011
e-ISSN	15334287
DOI	10.1519/JSC.0b013e31819bbea4
Journal	Journal of Strength and Conditioning Research
Issue Number	4
Volume Number	23
Language	English
Publisher	Lippincott Williams & Wilkins
Publisher Date	2009-07-01
Publisher Place	United States
Access Restriction	Open
Subject Keyword	Discipline Sport Sciences Athletic Performance Hip Joint Physiology Knee Joint Movement Volleyball Adolescent Biomechanical Phenomena Linear Models Range Of Motion, Articular Research Support, N.i.h., Extramural
Content Type	Text
Resource Type	Article
Subject	Orthopedics and Sports Medicine Physical Therapy, Sports Therapy and Rehabilitation Sports Science

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HIP AND KNEE EXTENSOR MOMENTS PREDICT VERTICAL JUMP HEIGHT IN ADOLESCENT GIRLS

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