The Analysis of Baseball Players Reaction

• Main Authors: Ming - Shain Lee, 李明憲
• Other Authors: Tzyy-Yuang Shiang .Ph.D.
• Format: Others
• Language: zh-TW
• Published: 2004
• Online Access: http://ndltd.ncl.edu.tw/handle/62728938980058725735

碩士 === 臺北巿立體育學院 === 運動科學研究所 === 92 === The Analysis of Baseball Players Reaction Author Ming-Shain Lee Thesis directed by Tzyy-Yuang Shiang Abstract The purpose of this study was to understand pitcher’s reaction time of catching infield line drive, pitching speed, and bat swing speed and build a baseball Coefficient of Restitution (COR) paradigm for four different levels of baseball players. Subjects were recruited from infantile, youth, junior, and senior baseball players, 70 subjects in total. The number of subjects in each level and their average age are 20 infantile players with average age 11.4±0.6 years old, 11 youth players with average age 16.0±0.1 years old, 18 junior players with average age 17.6±0.5, and 21 senior players with average age 20.7±1.5 years old. Radar gun, Photocells, visual and auditory stimuli, pitching machine, and high-speed camera were used as research tools. Therefore we can build a baseball coefficient paradigm for four different levels of baseball players. Data were collected and calculated by Microsoft excel 2000 to obtain mean and standard deviation. Then SPSS 10.0 was used to obtain descriptive statistics, one-way ANOVA, and Scheffe post hoc comparison. was, The results of this study showed the percentage of 4 levels pitchers catching 160 km/hour line drive was 38.3%, less than 40%. In other words, there was more than 60% risk while the infield line drive speed reached 160 km/hour toward to the pitcher. Results also showed all 3 different defense positions of 4 levels of pitchers didn’t have enough time to react and catch the 160km/hour infield line drive. This might cause severe injury. In order to prevent pitcher’s direct injury from infield line drive, enforcing the training of basic defense skills is a crucial approach. We can also amend the baseball rules and equipment regulations. Finally, we could suggest Baseball Association to create COR for each level player. Under these COR values, pitchers could have enough time to react and intercept to avoid injury. KEYWORDS: PITCHING SPEED, BAT SWING SPEED, REACTION