Imitation jumps in ski jumping: Technical execution and relationship to performance level期刊界 All Journals 搜尽天下杂志传播学术成果专业期刊搜索期刊信息化学术搜索

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Imitation jumps in ski jumping: Technical execution and relationship to performance level

Authors:	Gertjan Ettema Steinar Braaten Jørgen Danielsen Birk Eirik Fjeld

Institution:	1. Department of Neuromedicine and Movement Science, Faculty of Medicine and Health Sciences, NTNU, Centre for Elite Sports Research , Trondheim, Norway gertjan.ettema@ntnu.nohttps://orcid.org/0000-0002-3370-0957;3. Olympiatoppen , Norway;4. Department of Neuromedicine and Movement Science, Faculty of Medicine and Health Sciences, NTNU, Centre for Elite Sports Research , Trondheim, Norway

Abstract:	ABSTRACT Imitation jumps are frequently used in training for ski jumping. Yet, the dynamics of these jumps differ considerably. Thus, the relevance of imitation jumps for ski jumping performance is not elucidated. The aim of this study was to investigate the relationship between the technical execution of imitation jumps and ski jumping performance level. We compared the imitation jumps of 11 ski jumpers of different performance levels using a Spearman correlation transform of time traces of the kinetics (measured using force cells and motion capture) of imitation jumps. The kinetic aspects that were related to performance centred on the moment arm of ground reaction force to the centre of mass before the onset of the push-off, angular momentum early in push-off, thigh angle during the main period of push-off and vertical velocity towards the end of push-off. We propose that the thigh angle may be a key element allowing high development of linear momentum while preparing for appropriate aerodynamic position. Furthermore, the findings suggest that the kinetic development prior to (and during) push-off is more important than the kinematic end state at take-off.

Keywords:	Ski jump imitation biomechanics

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