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Trunk axial rotation in baseball pitching and batting
Glenn S Fleisig1, Wellington K Hsu2, Dave Fortenbaugh3
1American Sports Medicine Institute, Birmingham, AL 35205, USA. glennf@asmi.org
Sports Biomechanics
|January 29, 2014
Summary
Elite baseball pitchers and batters experience peak trunk axial rotation and angular acceleration during specific game actions. Pitching
Area of Science:
- Biomechanics of baseball
- Sports injury prevention
- Human movement analysis
Background:
- Understanding the biomechanical demands on the trunk is crucial for elite baseball performance.
- Trunk rotation and acceleration are key components of pitching and batting power generation.
- Previous research has not fully quantified these specific kinematic variables in professional athletes.
Purpose of the Study:
- To quantify trunk axial rotation and angular acceleration in elite baseball pitchers and batters.
- To identify the timing of peak trunk biomechanics during pitching and batting motions.
- To compare the trunk demands between pitching and batting actions.
Main Methods:
- Studied 40 professional baseball pitchers and 40 professional baseball batters.
- Utilized an eight-camera automated digitizing system to track reflective markers at 240 Hz.
- Calculated trunk axial rotation and angular acceleration from kinematic data.
Main Results:
- Maximum trunk axial rotation (55 +/- 6 degrees) and angular acceleration (11,600 +/- 3,100 degrees/s2) in pitching occurred near front foot contact.
- Maximum trunk axial rotation (46 +/- 9 degrees) and angular acceleration (7,200 +/- 2,800 degrees/s2) in batting occurred during the follow-through after ball contact.
- The most demanding trunk moments occurred near front foot contact for pitching and after ball contact for batting.
Conclusions:
- Elite baseball pitching and batting impose significant biomechanical stress on the trunk and spine.
- The timing of peak trunk demands differs between pitching and batting actions.
- These findings can inform injury prevention strategies and performance enhancement programs for baseball athletes.
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