蛇動運動の形態学的研究(2)
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概要
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In the previous study which examined the whole body antero-posterior snake-like motion of the body, it was found that smooth antero-posterior movement of the hips is the key factor for expression of power in the wave-like motions. In the current study, a hypothesis was made that the hip movement is also the key factor in the efficiency of whole body transverse snake-like motion. Thus, the importance of the hypothesis was to be examined in this study by similar procedure to the previous study. The subjects were asked to perform whole body transverse snake-like motion under four different conditions, while personal opinions/review poll was also applied. Then from the results, discussions would be made on the following two aspects, i.e., (1) correlationship between movement loci and differences among the subjects, and (2) correlationship between conditions 1 through 3 and 4 and differences between them. For the experiment, ten landmarks were set on the medial line of the subject and movie pictures were taken from the front side by use of Bolex 16mm camera. Objective observation of the total picture was made by use of 16mm editor and analyzer machines. Besides, by producing tracing loci by cinematograph and local pictures, comparisons and examinations would be made. Upon comparisons and examinations, the following results were obtained. Firstly, under first to third conditions, motions of the upper body only were observed, as the range of motion was small. Under the fourth condition, the movement was executed by whole body and its range of motion was large. Movements of knees and ankles were not clearly observed under first through third conditions, while it was evident under fourth condition. The hips moved smoothly at a large scale transversely under fourth condition. In this manner, the wave motion is transmitted smoothly without stopping the snake-like motion, as the personal poll indicated that this condition was the easiest to executeIn other words, the power was not fully transmitted to whole body under conditions 1 through 3, thus only upper body moved and the wave motion was small. On the other hand, under the fourth condition, the whole body resulted in smooth transverse motion which transmits the power in order. From the results above, the smooth transverse hip movement was found to be the important factor for transmitting the wave motion smoothly.
- 東京女子体育大学・東京女子体育短期大学の論文
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