The relationship of the number of pitches to the kinetics changes of pitching during a simulated baseball game

DOI Web Site 5 Citations 4 References Open Access

Bibliographic Information

Other Title
  • 野球投球における投球数と動作キネティクスとの関係

Description

<p>The purpose of this study was to investigate the relationship of the number of pitches to the kinetics changes of pitching during a simulated baseball game. Three male college baseball pitchers threw 15 pitches in an inning for 9 innings (135 pitches) in an indoor pitcher's mound with two force platforms. Rest time between innings was 6 minutes. Three-dimensional positions of 47 reflective markers attached to subject were tracked by an optical motion capture system (Vicon Motion System 612, Oxford Metrics) with eight cameras (250 Hz).For each subject 75 fastball pitches (1st, 3rd, 5th, 7th, and 9th inings) were chosen for analysis. Kinetic parameters were analyzed by simple linear regression analysis at three instants of motion events (p<0.05).</p><p>As the main results, the stride leg hip joint extension positive, negative and absolute work decreased with increasing the number of pitches. The throwing arm shoulder joint internal rotation positive work decreased with increasing the number of pitches. The throwing arm shoulder joint horizontal adduction positive and absolute work increased with increasing the number of pitches.</p>

Journal

  • Biomechanisms

    Biomechanisms 19 (0), 91-102, 2008

    Society of Biomechanisms

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