1 0 0 0 OA スキースロープスタイルにおける国内トップ選手のコーク720のテイクオフ動作の特徴
- 著者
- 高尾 千穂 岡部 文武 土屋 純
- 出版者
- 日本スキー学会
- 雑誌
- スキー研究 (ISSN:1349449X)
- 巻号頁・発行日
- vol.15, no.1, pp.93-100, 2018 (Released:2019-03-22)
- 参考文献数
- 11
Cork720 is a Ski Slopestyle jump trick, in which a skier's body rotates around an axis that is tilted away from the vertical and horizontal axis. The purpose of this study was to analyze the takeoff characteristics of the Cork720 of a Japanese top skier by comparing with the Upright 720 which rotates around the vertical axis. The subject was 1 top level male Ski Slopestyle athlete belonging to the Japanese national team( age: 20years, height: 168cm, weight: 64kg). Data were collected at a waterramp which is a typical off-season training facility for Freestyle ski. Two high speed video cameras were used to film from both sides of the jump and the three-dimensional(3-D) coordinate values were calculated by using the DLT method. Angles of the backward and sideward tilt of the body, the joint angles of the knees and hips, shoulder and hip rotation angles were analyzed. It was found that the takeoff motions of the Upright720 and Cork720 were similar, though Cork720 had larger back tilt of the body, the extension of the right knee and hip was larger, and the shoulder and hip started to rotate earlier. The side tilt of the body was thought to be the main factor to create the tilted axis of Cork720, and also would be the greatest difference between the two tricks, but in this case, it resulted that the side tilt of the body was almost the same. From these results, it was suggested that in this case, the tilted axis of the Cork720 was made by the back tilt of the body and the extension of the right knee joint and the right hip joint.
Cork720 is a Ski Slopestyle jump trick, in which a skier's body rotates around an axis that is tilted away from the vertical and horizontal axis. The purpose of this study was to analyze the takeoff characteristics of the Cork720 of a Japanese top skier by comparing with the Upright 720 which rotates around the vertical axis. The subject was 1 top level male Ski Slopestyle athlete belonging to the Japanese national team( age: 20years, height: 168cm, weight: 64kg). Data were collected at a waterramp which is a typical off-season training facility for Freestyle ski. Two high speed video cameras were used to film from both sides of the jump and the three-dimensional(3-D) coordinate values were calculated by using the DLT method. Angles of the backward and sideward tilt of the body, the joint angles of the knees and hips, shoulder and hip rotation angles were analyzed. It was found that the takeoff motions of the Upright720 and Cork720 were similar, though Cork720 had larger back tilt of the body, the extension of the right knee and hip was larger, and the shoulder and hip started to rotate earlier. The side tilt of the body was thought to be the main factor to create the tilted axis of Cork720, and also would be the greatest difference between the two tricks, but in this case, it resulted that the side tilt of the body was almost the same. From these results, it was suggested that in this case, the tilted axis of the Cork720 was made by the back tilt of the body and the extension of the right knee joint and the right hip joint.