관절운동의 제한이 던지기 동작의 운동역학적 변인에 미치는 영향

다국어 초록 (Multilingual Abstract)

The purpose of this study were a) To identify the effect on the bio-mechanical variables when joint motion is limited in ball throwing. b) To clarify contribution of each joint/segment in ball throwing. Seven male college students were participated in the experiment and they thrown a ball in 6 position - limited right wrist, right elbow, left arm, right knee, left knee and normal. Video image, E.M.G data, Ground reaction force data were collected when subjects performed their task. Some bio-mechanical variables were calculated for each subject and for each position. The means and standard deviations of variables were calculated for each position, and those were tested by paired sample t-Test. Followings are the conclusions. 1. Throwing distance: normal=38.1m, limited wrist=27.6m, limited elbow=24.4m, limited right knee=28.7m, limited left knee=30.3m, limited left arm=29.6m. They showed significant difference between normal and limited some joint. 2. Duration of throwing motion: normal=0.706S, limited wrist=0.686S, limited elbow=0.682S, limited right knee=0.677S, limited left knee=0.663S, limited left arm=0.677S. They did not show significant difference between normal and limited any joint. 3. Moving distance of C.O.G. in the sagittal plane: limited right knee were shorter than normal. 4. Moving distance of the ball in the sagittal plane: Shorter than normal when limited any joint. in the frontal plan: limited wrist and elbow were longer than normal. 5. Ground reaction force: R/L Min. Limied right knee, left knee, right elbow were larger than normal. R/L mean: Limited right knee were larger than normal. A/P mean; limited elbow were larger than normal. U/D min. and max.; limited right knee were larger than normal. 6. The order of muscle activation was changed when a joint motion was limited, rectus femoris and biceps femoris were activated earlier. 7. Mean amplitude of biceps brachialis when limited left arm and of gastrocnemius when limited wrist were less than normal. 8. The contribution ratio of each joint which calculated by throwing distance were wrist=27.1%, elbow=35.1%, right knee=24.4%, left knee=20.1%, left arm=21.7%.

참고문헌 (Reference)

• 1 김의진, ".신체분절의 운동이 던지기 운동에 미치는 영향" 129-133, 1982
• 2 진성태, ". 던지기 동작에서 각 신체분절의 역할" 1984
• 3 Hay, ". The Biomechanics of Sport Techniques. Englewood Cliffs. NJ" Prentice Hall. 1978
• 4 Hay, ". The Biomechanics of Sport Techniques. Englewood Cliffs. NJ" Prentice Hall. 1978