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How does the All-Star break affect injury rates in professional baseball?
Peter N Chalmers1, Kathryn Mcelheny2, John D'Angelo3
1University of Utah, Department of Orthopaedic Surgery, Salt Lake City, UT, USA.
JSES Reviews, Reports, and Techniques
|August 17, 2023
Summary
The All-Star break in professional baseball does not significantly impact player injury rates. Analysis of thousands of games shows no clinically meaningful difference in injuries following the break compared to other periods.
Area of Science:
- Sports Medicine
- Baseball Analytics
- Injury Epidemiology
Background:
- Professional baseball sees rising injury rates.
- The impact of the All-Star break rest period on injury risk remains unclear.
Purpose of the Study:
- To investigate if the timing of rest around the All-Star break influences injury incidence in professional baseball players.
Main Methods:
- Included 66,642 professional baseball games (2011-2017) across multiple leagues.
- Classified games as control (April, May, June, September) or post-All-Star break.
- Compared injury incidence between these two game categories.
Main Results:
- No significant difference in mean injuries per game between control and post-All-Star break games.
- Multivariate analysis showed a statistically significant but clinically insignificant association (effect size 0.001).
Conclusions:
- The All-Star break does not appear to alter injury rates per game in professional baseball.
- Despite providing rest, the break has no clinically meaningful effect on subsequent injury risk.
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