운동 역학 : 에어로빅 댄스의 운동역학적 분석 = Biomechanical Analysis of Movement Variables in Aerobic Dancing

다국어 초록 (Multilingual Abstract)

This study attemtps to figure out causes of the injuries that are incurred during aerobic dancing class. For the purpose, I surveyed three types of aerobic dancing classes -municipal hall aerobic class, commercial aerobic: class, non-profit sprots center class- around metropolitan area. Five physical factors of aerobic dancing are sorted out that seem to be closely related to body injuries. These factors consist of movement style, single practice time of each movement, number of repetition, total practice time of each movement, and each movement`s share of total practice time. In addition to these physical factors, one biomechanic factor, vertical ground-reaction force was selected. In order to measure these factors of aerobic dancing, I used video-tape recorders and force-platform. The following are main results of the survey and subsequent analyses.
1. Each aerobic class lasts a4 minutes and 26 seconds on average.
2. In municipal aerobic classes, walking, as a movement style, takes the lion`s share(36.9%) of total practice time whereas standing-up takes the largest share(44.9%) of the class time in nonprofit sports center classes.
3. Jump, the single major cause of body injury is, on average, performed for one minute and forty-six seconds in municipal aerobic classes while it is performed for one minute and four seconds and sixteen seconds in commercial aerobic classes and non-profit sports center classes respectively.
4. Total practice time for each movement style is on average as follows: standing-up and down(9 minutes and 52 seconds), running(8 minutes and 23 seconds), walking(6 minutes 44 seconds), step (6 minutes and 23 seconds), kick(1 minutes and 53 seconds), jump(1 minute and 2 seconds).
5. Average number of foot movement repetition by movement style amount to 639(running), 404 (walking), 333(step), kick(102), and jump(59) respectively.
6. The values of average vertical ground reaction force by movement style turn out to be 3.58 BW(step), 2.89 BW(running), 2.60 BW(kick), 2.29(jump), and 2.29 BW(walking) respectively.
7. The values of total ground reaction force by movement style are 1847 BW(running), 1176 BW (step), 917 BW(walking), 414 BW(standing-up), 265 BW(kick), and 135 BW(jump) respectively. And the grand total of these vertical ground reaction forces is 4754 BW.
Based on these results, we can draw a conclusion as follows. First, aerobic students invested the largest portion of exercise time(592 seconds) to standing-up and down movement.
It seems to be a characteristic of aerobic dance that the vertical ground reaction force of step movement was greater than those of both jump and running. Moreover, the vertical ground reaction force of aerobic dance walking turns out to be twice as great as that of ordinary walking. This can be explained by the fact that aerobic dance walking is characteritic of fore-foot landing.
Via measuring ground reaction force of various movements, it was revealed that in stepping and walking, one can, by fully using fore-foot and knee joint, not only absorb passive impact but also utilize active muscle power effectively.
For the next research, one may align all the exercise movements in the order of time and check whether a particular movement generates very high impact. Furthermore, if one compute energy consumption of each aerobic movement, then it will help analyse daily energy consumption and keep energy balance.