숙련성에 따른 스노보드 턴 동작의 제어전략

Abstract

The purpose of this study is to understand the control strategic of the turn in snowboard according to expertise. Six experts and ten novices participated in this experiment. The task was to ride a snowboard, turn four cones, and down the slope. Four camcorders were used for recording. DLT method was used to get the 3D data. The data was analyzed with Kwon3D motion analysis system. Statistics was used to carry out the two-group discriminant analysis, and the significance level set at p<.05.<BR> results of this study were as follows: First, the novices showed an increasing rate of time performing as a characteristics of the task while experts showed a relatively constant rate performance for the phase of movement performance patterns. Second, the experts showed smaller angle chang of the shoulder line than novices in the phase 1. This indicates that the novice"s shoulder line movement is actively involved in the pattern of the degree of freedom released. On the other hand, in the phase 2, it can be seen that the experts is more involved in the task performance than the novices, as the degree of freedom in which angle chang of the knee line is larger than the novices. Third, the result of the coordination of the form of the alignment line for experts showed a strong coupled form of them and novices showed a released form. All subjects showed an anti-phase movement form.<BR> In conclusion, to control of snowboard movement, in phase two; the experts used a control strategy of lower body through the form of coupled coordination, which is significant then the involved within the novices. But, the novices used a control strategy to make turns with upper body movement in the phase 1 and showed a pattern of released coordination in all phases.