Impact of 12-s rule on performance and muscle damage of baseball pitchers
(Der Einfluss der 12er-Regel auf Leistung und Muskelschädigung bei Baseball-Werfern)
Introduction: A recent US Major League Baseball (MLB) rule change requires baseball pitchers to deliver pitches within 12 s.
Purposes: To examine the effect of three between-pitch rest intervals on throwing performance during a simulated seven-inning game and muscle damage during postgame recovery.
Design: A randomized counterbalanced study.
Methods: Seven intercollegiate pitchers threw 15 pitches per inning for seven innings with rest interval trials of 8, 12, and 20 s between pitches and 5 min between innings. Pitchers threw aimed fastballs at their best effort. Trials were separated by =2 wk.
Results: Progressive decreases in pitching speed and accuracy below baseline (first inning of 20-s trial) occurred after fourth inning during the 8-s and 12-s trials, but not the 20-s trial. Plasma creatine kinase elevated 48 h later for the 8-s and 12-s trials (+105% and +75%, P < 0.01), but not the 20-s trial (+26%, no significance). A transient interleukin (IL)-6 surges immediately after the game for the 8- and 12-s trials (+265%, +128%, P < 0.01) above baseline. IL-6 reversed below the level of 20-s trial at 48 h after game, whereas IL-10 increased significantly above the level of 20-s trial.
Conclusions: Under the same pitching load, decreasing rest interval from 20 to 12 s or less results in an early-onset performance loss during a game and increases in muscle damage and inflammation for more than 2 d after a game. Our data do not favor the current rule change in concern of keeping musculoskeletal health of pitchers.
© Copyright 2016 Medicine & Science in Sports & Exercise. Lippincott Williams & Wilkins. Alle Rechte vorbehalten.
Schlagworte: | Baseball Wurf Muskel Muskelphysiologie Schaden Leistung Gesundheit Relation Wettkampfbestimmung |
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Notationen: | Spielsportarten |
DOI: | 10.1249/MSS.0000000000001048 |
Veröffentlicht in: | Medicine & Science in Sports & Exercise |
Veröffentlicht: |
2016
|
Jahrgang: | 48 |
Heft: | 12 |
Seiten: | 2512-2516 |
Dokumentenarten: | Artikel |
Sprache: | Englisch |
Level: | hoch |