The Korean Journal of Physical Education (한국체육학회지)

Korean Alliance for Health: Physical Education: Recreation:and Dance (한국체육학회)
권호 표지

Analysis of upper Body Kinematic Variable according to Difference of Ball Velocity in Baseball Pitching

야구 투구 시 볼 속도 차이에 따른 상체의 3차원 운동학적 분석

Cho, Young-Jae;Lee, Sung-Cheul;Moon, Gon-Sung;Park, Jong-Rul
조영재;이성철;문곤성;박종률

  • Published : 20040000
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Abstract

The purpose of this study was to present difference of upper Body kinematic variable according to plane when pitched ball velocity increase in the same subject in two pitched ball velocity such as 110km, 120km. The subjects of this study were the nine right-handed pitcher who belonged to professional, university and high school. 3D cinematograph which pictured subjects was analyzed by LabVIEW 6i(Johnson, G.W., 2000) and SPSS 10. 0 to compare ten kinematic variables by plane. The results can be summarized as follows: In linear velocity, it had the maximal value in such order as hip, shoulder, elbow, hand. Especially, the time when elbow segment and hand segment had the maximal value was different from the time when ball velocity was slow according to ball velocity increased. Trunk tilt angle, elbow angle and pelvis rotation angle had statistically significant difference in the time when lead foot contact and shoulder`s maximal external rotation. When Instance of ball release, kinematic variables had statistically significant difference in horizontal rotation of shoulder, trunk tilting angle, trunk rotation angle. Also, Angular velocity of maximal upper torso, angle velocity of maximal pelvis, angle of maximal elbow, Extension angle of maximal elbow and maximal internal rotation velocity had statistically significant difference in cocking plane or acceleration plane.

Keywords

References

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