The influence of shoulder abduction and external rotation on throwing arm kinetics in professional baseball pitchers

Background The relationships between shoulder abduction and external rotation with peak kinetic values at the shoulder and elbow in professional baseball pitchers are not well established. Methods Professional pitchers (n = 322) threw 8–12 fastballs under 3D motion analysis (480 Hz). Pitchers were s...

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Bibliographic Details
Published in:Shoulder & elbow 2022-07, Vol.14 (1_suppl), p.90-98
Main Authors: Manzi, Joseph E, Dowling, Brittany, Trauger, Nicolas, Fu, Michael C, Hansen, Benjamin R, Dines, Joshua S
Format: Article
Language:English
Subjects:
Shoulder
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Summary:Background The relationships between shoulder abduction and external rotation with peak kinetic values at the shoulder and elbow in professional baseball pitchers are not well established. Methods Professional pitchers (n = 322) threw 8–12 fastballs under 3D motion analysis (480 Hz). Pitchers were stratified into quartiles by shoulder abduction and external rotation at distinct timepoints. Regression analyses were performed to quantify associations between shoulder position and kinetics. Results Shoulder abduction remained relatively consistent throughout the pitch (foot contact–ball release: 85.5 ± 11.1–90.7 ± 8.4°); shoulder external rotation increased dramatically (foot contact–ball release: 30.8 ± 24.6–165.2 ± 9.7°). For every 10° increase in maximum shoulder rotation, shoulder superior force increased by 2.3% body weight (p 
ISSN:1758-5732
1758-5740
DOI:10.1177/17585732211010300