The impact of pitch counts and days of rest on performance among major-league baseball pitchers

Journal of Strength and Conditioning Research
John C Bradbury, Sean L Forman

Abstract

Although the belief that overuse can harm pitchers is widespread, there exists little evidence to show that the number of pitches thrown and the days of rest affect future performance and injury among adults. The purpose of this study is to quantify the effects of pitches thrown and the days of rest on pitcher performance. We examined performances of major-league baseball starting pitchers from 1988 to 2009 using fractional polynomial multiple regression to estimate the immediate and cumulative impact of pitches thrown and the days of rest on performance, while controlling for other factors that likely affect pitcher effectiveness. Estimates indicate each pitch thrown in the preceding game increased earned run average (ERA) by 0.007 in the following game. Each pitch averaged in the preceding 5 and 10 games increased the ERA by 0.014 and 0.022, respectively. Older pitchers were more sensitive to cumulative pitching loads than younger pitchers were, but they were less affected by pitches thrown in the preceding game. Rest days were weakly associated with performance. In summary, we found that there is a negative relationship between past pitches thrown and future performance that is virtually linear. The impact of the cumulative ...Continue Reading

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Citations

May 25, 2013·Orthopedic Reviews·Xinning LiStruan Coleman
Aug 5, 2015·Physical Therapy in Sport : Official Journal of the Association of Chartered Physiotherapists in Sports Medicine·Ellen ShanleyCharles A Thigpen
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Aug 9, 2019·PeerJ·Richard BirferMichael Wr Holmes
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Oct 15, 2021·BMC Sports Science, Medicine and Rehabilitation·Wen-Yi ChouShun-Wun Jhan
Jan 11, 2022·The American Journal of Sports Medicine·Joseph E ManziJoshua S Dines

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