INTRODUCTION: The aim of the study was to determine the structure of the impulse of the push-off force in three different forms of imitation of elite female ski jumpers. METHODS: An elite Slovenian female ski jumper participated in the experimental study conducted in August 2018. She realized the jump on a special measuring device, in jumping shoes, on the imitated hill slope of 10 degrees. The athlete performed the first imitation of the jump, where the centre of mass (CoM) moved forward by 30 cm during the jump, then by 60 cm, and finally she performed the imitation of the jump where she was caught by the trainer. To monitor each jump, the following ground reaction force variables were recorded: the total force of the jump perpendicular to the ground; the perpendicular force at the first and rear left and right feet; the total force of the jump parallel to the take-off plate; the total force of the jump parallel to the take-off plate at the left and right legs. RESULTS: In the first part of the imitation jump`s take-off by the trainer catch, the vertical component of take-off force increased markedly, while the parallel component of the take-off force increased significantly in the second part. DISCUSSION: The impulse structure of the take-off force in the two jumps where the CoM moved 30 cm and 60 cm was quite similar and more realistically reflected the structure of the take-off force on the jumping hill. In the first part of the realistic take-off phase on the jumping hill, the force is acting perpendicular to the ground, while in the second part of take-off phase, the jumper`s CoM moves forward about 20 to 30 cm. CONCLUSION: When imitating the take-off in ski jumping, a different coordination of movement is expressed in comparison to jumping on the realistic ski jump. The more the jumper shifts the CoM when imitating the take-off, the greater the difference. The popular imitation of the take-off where the coach is catching the jumper differs remarkably from the realistic take off action on the ski jumping hill and there is different movement coordination. REFERENCES: Jošt, B., Vodicar, J. in Supej, M. (2021). Developing Take off Power in Ski-jumping. Hamburg: Verlag Dr. Kovac.
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