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

Kevin R. Ford, Gregory D. Myer, Jensen L. Brent, Timothy E. Hewett

Research output: Contribution to journalArticlepeer-review

13 Scopus citations

Abstract

Ford, KR, Myer, GD, Brent, JL, and Hewett, TE. Hip and knee extensor moments predict vertical jump height in adolescent girls. J Strength Cond Res 23(4): 1327-1331, 2009-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.

Original languageEnglish (US)
Pages (from-to)1327-1331
Number of pages5
JournalJournal of Strength and Conditioning Research
Volume23
Issue number4
DOIs
StatePublished - Jul 2009

Keywords

  • Biomechanics
  • Female athlete
  • Lower extremity
  • Performance

ASJC Scopus subject areas

  • Orthopedics and Sports Medicine
  • Physical Therapy, Sports Therapy and Rehabilitation

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