Abstract
The purpose of this study is to quantify ground reaction force from directions of anterior-posterior, medial-lateral and vertical according to locomotion speed which influence dynamic stability and stability index to analyze the degree of contribution to dynamic stability. For this experiment, 10 healthy male college students participated, all of whom were right-footed. The walking speed was set to 4.5km/h and 6km/h, running speed to 8km/h and 12km/h, and force plate was used to compute maximum anterior-posterior, medial-lateral and vertical ground reaction force and stability index/dynamic stability index per each direction. The results are as follows: 1. Along with increase in locomotion speed, ground reaction force per each direction tended to increase. But maximum anterior-posterior ground reaction force was decreased and similar in slow walking and run-ning. 2. Along with increase in locomotion speed, stability in each direction was found to decrease. In conclusion, the degree of contribution per each direction to stability index was the greatest for vertical ground reaction force in both walking and running, and it was found that the ratio of anterior-posterior ground reaction forces were relatively greater in walking than in running.
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