Agus Rusdiana
The purpose of this study was to find out the effect of fatigue on ball velocity in relation to kinematic changes in the sequence of motion performed by baseball pitchers. The samples of this study were 12 baseball male athletes, who played as pitchers of Universitas Pendidikan Indonesia, aged ±19 years old, with the height of ±171.4cm and weigh of ±64.3kg. The method used in this study was descriptive quantitative method with a pre-test and post-test design. The instruments of this study were three handy cams, a high speed video camera, a speed gun radar, a set of calibration tools, a force platform, a set of light markers, a motion capture system software and a heart rate monitor. The results of this study showed that there were six indicators which had a significant relationship with the overhead pitching speed when the pitchers were in the normal and fatigue conditions, including stride length percentage height, elbow flexion, maximum shoulder horizontal adduction, maximum elbow extension angular velocity, maximum shoulder internal rotation angular velocity, and lateral trunk tilt. The body segment motions which have high contributions on the pitcher’s overhead pitching outcomes include the internal shoulder rotation, elbow extension angular velocity, and lateral trunk tilt. © 2019, Drustvo Pedagoga Tjelesne i Zdravstvene Kulture. All rights reserved.
Sport Science Study Program, Faculty of Sport and Health Education, Indonesia University of Education, Indonesia
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