スキージャンプ競技場面における踏力の測定

抄録

The purpose of this study was to identify the relation between the force production during take-off by ski jumpers and their performance. The force measuring system which constructed under the take-off platform was used to measure the normal forces exerted during take-off by ski jumpers. This field research was conducted in a competition “FIS Continental Cup Asia Series NTT Cup Summer Jumping Games” in 1996.

Three variables were analyzed as follows: the average forces (F'_6-0m), the peak force value (Fz_peak) and the net impulse (I_6-0m) of the force measured from the last 6 m of the take-off platform. These variables were significantly correlated to the distance of ski jumping. Also these variables were compared between two groups: the 1 - 10 placers (longest 10) and the 41 - 50 placers (shortest 10). All the variables obtained by the longest 10 group showed significantly higher value than those of the shortest 10 group. These results indicate that the force production during the take-off has some effects on the ski jumping performance. It was found that the force curves obtained from the same subject were closely similar to each other. Comparison was conducted between two ski jumpers about their ways of force production. These two ski jumpers had same amount of the impulse of the force, but their ways of force production were very different.