남자 배구선수들의 후위공격(Back Attack) 동작에 대한 운동역학적 분석

Abstract

ABSTRACT

The Biomechanical Analysis of the Back Attack on Men's Volleyball Players

Yun, Chung-Keol Advisor : Prof. Kyung-Il. Lee, PhD Department of Physical Education, Graduate School, Chosun University

The purpose of this study is to do a comparative analysis of the biomechanical differences depending on success and failure when men's volleyball players do back attack. To this end, five college volleyball players were selected. Six infrared cameras and two force platforms were used to derive kinetic variables, and time, movement of center of gravity, velocity of center of gravity, angle, angular velocity and maximum ground reaction force were calculated by using Kwon3D X program. Maximum EMG activity analysis was calculated by utilizing Noraxon Myoresearch. To identify the differences between success and failure, paired sample t-test was conducted by using SPSS 18.0, the significant level was set to .05. The conclusion obtained through the analysis of data is as follows:

1. Take-off phase First, depending on the status of success on the take-off phase, there were significant differences in the movement of center of gravity, in case of success, forward movement appeared great. Second, depending on the status of success on the take-off phase, there was a significant difference in the movement of trunk extension angle. Third, depending on the status of success on the take-off phase, there were significant differences in maximum muscular activity of the right side of erector spinae muscle, in case of success, muscular activity appeared.

2. Jumping phase First, according to the status of success on the jumping phase, there were significant differences in the movement of trunk extension angle, in case of success, the movement of trunk expansion excise appeared a little. Second, according to the status of success on the jumping phase, there were significant differences in the perpendicular ground reaction force of the right foot, in case of success, the perpendicular ground reaction force appeared a lot. Third, according to the status of success on the jumping phase, there were significant differences in the perpendicular ground reaction force of the right foot, in case of success, the forward and back ground reaction force appeared a lot.

3. Back attack phase First, depending on the status of success on the back attack phase, there were significant differences in maximum muscular activity of the right deltoid, in case of success, high muscular activity appeared. Second, depending on the status of success on the back attack phase, there were significant differences in kinematic variables.

4. Follow-through phase First, according to the status of success on the follow-through phase, there were significant differences in maximum muscular activity of the right rectus femoris, in case of success, high muscular activity appeared. Second, according to the status of success on the follow-through phase, there were no significant differences in kinematic variables.

Looking at the results of the study, regarding the status of volleyball back attack's success, players should a lot of forward movement for timing adjustment on the take-off phase and it will be effective to do greatly trunk expansion movements using the erector spinae muscle that is the trunk expansion muscle. To minimize trunk expansion movements and to switch horizontal force into normal force on the jumping phase, players should use a large back ground reaction force, muscular strength of the deltoid to play a role of the muscular strength to support the shoulder can be very important on the back attack phase. Effective landing operations by using quadriceps muscle of thigh when landing will be needed on the follow-through phase. The feature of Back attack in volleyball is to be done at a fixed distance of 3m unlike a typical attack. For this, it's necessary to learn the operations through repetitive practice, if the way to maximize technology improvement through practice is devised and integrated into players, it will be a big help in performance enhancement.

Keyword : Back Attack, EMG, Kinetic