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Title: Kinematics and Kinetics of Squats, Drop Jumps and Imitation Jumps of Ski Jumpers
Authors : Pauli, Carole A.
Keller, Melanie
Ammann, Fabian
Hübner, Klaus
Lindorfer, Julia
Taylor, William R.
Lorenzetti, Silvio
Published in : Journal of Strength and Conditioning Research
Volume(Issue) : 30
Issue : 3
Pages : 643
Pages to: 652
Publisher / Ed. Institution : National Strength and Conditioning Association
Issue Date: 4-Mar-2016
License (according to publishing contract) : CC BY-NC-ND 4.0: Namensnennung - Nicht kommerziell - Keine Bearbeitungen 4.0 International
Type of review: Peer review (Publication)
Language : English
Subjects : Performance; Ski jumping; Movement analysis
Subject (DDC) : 571: Physiology and related subjects
Abstract: Squats, drop jumps, and imitation jumps are commonly used training exercises in ski jumping to enhance maximum force, explosive force, and sport-specific skills. The purpose of this study was to evaluate the kinetics and kinematics of training exercises in ski jumping and to find objective parameters in training exercises that most correlate with the competition performance of ski jumpers. To this end, barbell squats, drop jumps, and imitation jumps were measured in a laboratory Environment for 10 elite ski jumpers. Force and motion data were captured, and the influence of maximum vertical force, force difference, vertical take-off velocity, knee moments, knee joint power, and a knee valgus/varus index was evaluated and correlated with their season jump performance. The results indicate that, especially for the imitation jumps, a good correlation exists between the vertical take-off velocity and the personal jump performance on the hill (R = 0.718). Importantly, however, the more the athletes tended toward a valgus knee alignment during the measured movements, the worse their performance (R = 0.729 imitation jumps; R = 0.685 squats). Although an evaluation of the athletes’ lower limb alignment during competitive jumping on the hill is still required, these preliminary data suggest that performance training should additionally concentrate on improving knee alignment to increase ski jumping performance.
Departement: Gesundheit
Organisational Unit: Institute of Physiotherapy (IPT)
Publication type: Article in scientific Journal
DOI : 10.1519/JSC.0000000000001166
ISSN: 1064-8011
Appears in Collections:Publikationen Gesundheit

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