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The purpose of this study is to provide descriptive and comparative information regarding the cardiorespiratory fitness of professional baseball pitchers. Twenty-four ( n = 24) major league (ML) baseball pitchers (starters n = 14; relievers n = 10) over seven seasons (2007⁻2013) were evaluated. A modified Bruce protocol and the CardioCoach™ CO₂ metabolic analyzer were used to estimate VO 2 max and anaerobic threshold (AT) at the beginning of each season. Performance data from each season was utilized to draw inference about pitching performance. One-way Analysis of Variance (ANOVA) was used to compare Starting (S) and Relief (R) pitchers above/below the group mean for VO 2 max and AT. Pearson product moment correlations were also used to examine relationships between cardiorespiratory fitness and performance. Significant differences in performance were discovered between S pitchers above/below the overall group mean for VO 2 max . ( p ≤ 0.05) and for AT in Walks plus Hits per Inning Pitched (WHIP) ( p ≤ 0.05) and Earned Run Average (ERA) ( p ≤ 0.05). Significant relationships between VO 2 max and Walks per 9 Innings (BB/9) ( p ≤ 0.05), Home Runs per 9 innings (HR/9) ( p ≤ 0.05), Wins (W) ( p ≤ 0.05), Fielding Independent Pitching (FIP) ( p ≤ 0.01), Strikeouts (K) ( p ≤ 0.01), Hits per 9 innings (H/9) ( p ≤ 0.01), Strikeouts per 9 innings (K/9) ( p ≤ 0.01), ERA ( p ≤ 0.01), and WHIP ( p ≤ 0.01). Low, but significant, correlations were discovered between AT and WHIP ( p ≤ 0.05) and ERA (≤0.05).

A Description and Comparison of Cardiorespiratory Fitness Measures in Relation to Pitching Performance Among Professional Baseball Pitchers