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Generation Mechanism of Linear and Angular Ball Velocity in Baseball Pitching

1
Faculty of Health and Sport Sciences, University of Tsukuba, Tsukuba 3058574, Japan
2
Graduate School, University of Tsukuba, Tsukuba 3058574, Japan
3
Sports Research & Development Core, University of Tsukuba, Tsukuba 3058574, Japan
*
Author to whom correspondence should be addressed.
Presented at the 12th Conference of the International Sports Engineering Association, Brisbane, Queensland, Australia, 26–29 March 2018.
Proceedings 2018, 2(6), 206; https://doi.org/10.3390/proceedings2060206
Published: 23 February 2018
The purpose of this study was to quantify the functional roles of the whole-body’s joint torques including fingers’ joints in the generation of ball speed and spin during baseball fast-ball pitching motion. The dynamic contributions of joint torque term, gravitational term, and motion-dependent term (MDT) consisting of centrifugal force and Coriolis force, to the generation of the ball variables were calculated using two types of models. Motion and ground reaction forces of a baseball pitcher, who was instructed to throw a fastball into the target, were measured with a motion capture system with two force platforms. The results showed (1) the MDT is the largest contributor to ball speed (e.g., about 31 m/s prior to ball release) when using 16-segment model, and (2) the horizontal adduction torque of pitching-side shoulder joint plays a crucial role in generating ball speed with conversion of the MDT into other terms using a recurrence formula.
Keywords: baseball pitching; dynamic contribution; ball speed; ball spin; induced speed analysis; multi-body dynamics baseball pitching; dynamic contribution; ball speed; ball spin; induced speed analysis; multi-body dynamics
MDPI and ACS Style

Koike, S.; Uzawa, H.; Hirayama, D. Generation Mechanism of Linear and Angular Ball Velocity in Baseball Pitching. Proceedings 2018, 2, 206. https://doi.org/10.3390/proceedings2060206

AMA Style

Koike S, Uzawa H, Hirayama D. Generation Mechanism of Linear and Angular Ball Velocity in Baseball Pitching. Proceedings. 2018; 2(6):206. https://doi.org/10.3390/proceedings2060206

Chicago/Turabian Style

Koike, Sekiya; Uzawa, Hiroki; Hirayama, Daisaku. 2018. "Generation Mechanism of Linear and Angular Ball Velocity in Baseball Pitching" Proceedings 2, no. 6: 206. https://doi.org/10.3390/proceedings2060206

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