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 (2016). Kinematics and kinetics of squats, drop jumps and imitation jumps of ski jumpers Journal of Strength and Conditioning Research (The), 30(3), pp. 643-652. Lippincott Williams & Wilkins 10.1519/JSC.0000000000001166

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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.

Item Type:	Journal Article (Original Article)
Division/Institute:	Swiss Federal Institute of Sports Magglingen SFISM > EHSM - Leistungssport > Sportphysiologie Kraft
Name:	Pauli, Carole A.; Keller, Melanie; Ammann, Fabian; Hübner, Klaus; Lindorfer, Julia; Taylor, William R. and Lorenzetti, Silvio
ISSN:	1064-8011 (Print) 1533-4287 (Online)
Publisher:	Lippincott Williams & Wilkins
Language:	English
Submitter:	Service Account
Date Deposited:	24 Feb 2021 10:22
Last Modified:	25 Sep 2021 02:18
Publisher DOI:	10.1519/JSC.0000000000001166
PubMed ID:	26418370
Uncontrolled Keywords:	performance ski jumping movement analysis Sportphysiologie Kraft
ARBOR DOI:	10.24451/arbor.10928
URI:	https://arbor.bfh.ch/id/eprint/10928