Korean Journal of Applied Biomechanics (한국운동역학회지)

Korean Society of Applied Biomechanics (한국운동역학회)
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Kinematic Analysis of Baseball Throw after 15 Weeks of Class

15주 야구 수업을 통한 던지기 동작의 운동학적 변인 변화 분석

  • Chun, Young-Jin (Department of Physical Education, College of Education, Seoul National University) ;
  • Shin, In-Sik (Department of Physical Education, College of Education, Seoul National University)
  • 천영진 (서울대학교 사범대학 체육교육과) ;
  • 신인식 (서울대학교 사범대학 체육교육과)
  • Received : 2012.01.31
  • Accepted : 2012.03.08
  • Published : 2012.03.31
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Abstract

The purpose of this study was to investigate the pattern change of throwing in baseball after 15 weeks of participation in baseball class, by examining ball speed, trunk and upper body angles. The comparison was with 6 university students that haven't had any experience in baseball. 8 infra red cameras and 2 force platforms were used to collect the data. First, there was an increase in the speed of the ball after the class. Second, there was no significant difference in the allocated phases during the throw before and after class. Third, the release point was lower and more in front. Forth, there was an increase in the knee flexion at the left foot landing and release point. Finally, there was an increase in the maximum shoulder external rotation and pelvis angle. It is recommended that the coordination between the segments should be investigated to improve our understanding of the learning of throwing in future research.

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References

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