AI Article Synopsis
- Imitation jumps are commonly used in ski jumping training, but their effectiveness for actual performance is unclear.
- The study analyzed 11 ski jumpers of varying skill levels to examine how imitation jump techniques relate to their performance, focusing on kinetic factors measured through motion capture and force cells.
- Key findings indicated that elements like thigh angle and ground reaction force timing before push-off are critical for developing the right momentum and preparing for an aerodynamic position, suggesting that early push-off dynamics are more vital than the final take-off position.
Article 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.
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| http://dx.doi.org/10.1080/02640414.2020.1776913 | DOI Listing |
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