大学生男女初心者のけのび動作における力発揮と認識の変容

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In this study, we analyze the gliding form by using a digital video camera system connected to an underwater force plate. In addition, we also examine the streamlined position of the body by considering motion analysis and the locus of the center of gravity as well as information regarding the body positions in the pre and post skill practice stages. Six male and seven female beginner varsity swimmers were employed as subjects for measuring the force and the images of the gliding motion while swimming. The experimental protocols were as follows: approximately an hour per day, twice a week, and a total practice period of around a month. The average distance covered by the gliding motion for the male swimmers was 7.5 ± 0.64 m in the pre-training stage and 8.50 ± 0.93 m in the post-training stage. On the other hand, it was 6.9 ± 0.91 m in the pre-training stage and 8.1 ± 1.52 m in the post-training stage for the female swimmers (p<0.05). There were significant differences between the pre and post-practice stages with regard to the duration of push off in the male and female subjects, respectively. During the post-practice stage, the depth of the center of gravity for the male and female subjects was more apparent than that during the pre-practice stage; in addition, the angle of the hip joint appeared at a position parallel to the water surface, submerging 0.5 s after kick off. Moreover, the awareness of the body position during the gliding motion showed greater values when compared with that of the pre-practice stage. The body position of the male and female swimmers, particularly during the contact phase and after the kick off phase, exhibited deeper submerging with a streamlined position. These findings support the notion that it might be beneficial for beginner swimmers to perform the gliding motion underwater at a depth of around 0.4 m in order to reduce the vortex drag efficiently.
日本スポーツ方法学会の論文
2006-03-10

大学生男女初心者のけのび動作における力発揮と認識の変容

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