ABSTRACT

The difference analysis of kinematic variable and muscle activity on sail up according to skill degree in windsurfing

Kim Chang-Min
Advisor : Prof. Kyung-Il Lee Ph.D.
Major in Physical Education,
Graduate School of Chosun University

This study was to do a comparative analysis on kinematic differences and differences in muscle activity between the skilled and the unskilled in windsurfing sail up actions and to present the basic theory of the sail up actions. For this, it was conducted targeting 3 killed people with more than 3 years of experience and 3 unskilled people with less than 1 year of experience. The video experiment was analyzed through Kwon3D XP after shooting it by 30frame/s with 4 cameras, EMG measured the muscle activity of the straight muscle of thigh, gastrocnemius, erector spinae muscules using Telemyo 2400T. The results of the comparative analysis on the data measured in this experiment obtained the following conclusions.

First, in sail up actions, skilled people did them as their knee angle was increasing in order of E1-E2-E without changes in the knee angle, on the other hand, unskilled people showed inefficient movement in order of E1-E3-E2.
Second, in sail up actions, skilled people performed them by minimizing the back angle variation in the state of extending the waist.
Third, in sail up actions, skilled people set up the mast safely taking a long time after the boom end.
Fourth, skilled people did sail up actions by lessening the back angle.
Fifth, in sail up actions, for skilled people, the muscle activity of the right gastrocnemius appeared high.
Sixth, in sail up actions, skilled people showed the high muscle activity of the straight muscle of thigh.
Seventh, in sail up actions, the muscle activity of erector spinae muscules showed differences in E2, skilled people showed the high muscle activity.