Kinematics and Kinetics of Squats, Drop Jumps and Imitation Jumps of Ski Jumpers

Kinematics and Kinetics of Squats, Drop Jumps and Imitation Jumps of Ski Jumpers

Pauli, CA, Keller, M, Ammann, F, Hübner, K, Lindorfer, J, Taylor, WR, and Lorenzetti, S. Kinematics and kinetics of squats, drop jumps and imitation jumps of ski jumpers. J Strength Cond Res 30(3): 643–652, 2016—Squats, drop jumps, and imitation jumps are commonly used training exercises in ski jump...

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Main Authors: Pauli, Carole A., Keller, Melanie, Ammann, Fabian, Hübner, Klaus, Lindorfer, Julia, Taylor, William R., Lorenzetti, Silvio
Format: Online
Language:English
Published: Journal of Strength and Conditioning Research 2016
Online Access:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4780482/
id pubmed-4780482
recordtype oai_dc
spelling pubmed-47804822016-03-28 Kinematics and Kinetics of Squats, Drop Jumps and Imitation Jumps of Ski Jumpers Pauli, Carole A. Keller, Melanie Ammann, Fabian Hübner, Klaus Lindorfer, Julia Taylor, William R. Lorenzetti, Silvio Original Research Pauli, CA, Keller, M, Ammann, F, Hübner, K, Lindorfer, J, Taylor, WR, and Lorenzetti, S. Kinematics and kinetics of squats, drop jumps and imitation jumps of ski jumpers. J Strength Cond Res 30(3): 643–652, 2016—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. Journal of Strength and Conditioning Research 2016-03 2016-03-04 /pmc/articles/PMC4780482/ /pubmed/26418370 http://dx.doi.org/10.1519/JSC.0000000000001166 Text en © 2015 National Strength and Conditioning Association This is an open access article distributed under the terms of the Creative Commons Attribution-NonCommercial-NoDerivatives License 4.0 (CC BY-NC-ND) (http://creativecommons.org/licenses/by-nc-nd/4.0/) , which permits downloading and sharing the work provided it is properly cited. The work cannot be changed in any way or used commercially.
repository_type Open Access Journal
institution_category Foreign Institution
institution US National Center for Biotechnology Information
building NCBI PubMed
collection Online Access
language English
format Online
author Pauli, Carole A.
Keller, Melanie
Ammann, Fabian
Hübner, Klaus
Lindorfer, Julia
Taylor, William R.
Lorenzetti, Silvio
spellingShingle Pauli, Carole A.
Keller, Melanie
Ammann, Fabian
Hübner, Klaus
Lindorfer, Julia
Taylor, William R.
Lorenzetti, Silvio
Kinematics and Kinetics of Squats, Drop Jumps and Imitation Jumps of Ski Jumpers
author_facet Pauli, Carole A.
Keller, Melanie
Ammann, Fabian
Hübner, Klaus
Lindorfer, Julia
Taylor, William R.
Lorenzetti, Silvio
author_sort Pauli, Carole A.
title Kinematics and Kinetics of Squats, Drop Jumps and Imitation Jumps of Ski Jumpers
title_short Kinematics and Kinetics of Squats, Drop Jumps and Imitation Jumps of Ski Jumpers
title_full Kinematics and Kinetics of Squats, Drop Jumps and Imitation Jumps of Ski Jumpers
title_fullStr Kinematics and Kinetics of Squats, Drop Jumps and Imitation Jumps of Ski Jumpers
title_full_unstemmed Kinematics and Kinetics of Squats, Drop Jumps and Imitation Jumps of Ski Jumpers
title_sort kinematics and kinetics of squats, drop jumps and imitation jumps of ski jumpers
description Pauli, CA, Keller, M, Ammann, F, Hübner, K, Lindorfer, J, Taylor, WR, and Lorenzetti, S. Kinematics and kinetics of squats, drop jumps and imitation jumps of ski jumpers. J Strength Cond Res 30(3): 643–652, 2016—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.
publisher Journal of Strength and Conditioning Research
publishDate 2016
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4780482/
_version_ 1613548288961675264

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