Article Title



Hillary Ake1, Hunter Haynes2, Riley Galloway2, Paul Donahue2, John C. Garner3. 1University of Florida, Gainesville, FL. 2Univeristy of Southern Mississippi, Hattiesburg, MS. 3Troy University, Troy, AL.

BACKGROUND: In recent years there has been increased interest in the implementation of weighted baseball training as a strategy for increasing pitch velocity. Therefore, the purpose of this retrospective study was to examine the efficacy of overload (20% greater than regulation weight) and underload (20% less than regulation weight) throwing on the pitch velocity of collegiate pitchers over the course of an off-season. METHODS: Pitch velocity of varsity collegiate baseball pitchers (N=56) from 2012-2015 was examined following the completion of two separate off-season throwing programs. The weighted implement (WI) group (n=35) used overload (6oz) and underload (4oz) baseballs in addition to normal throwing activities with a regulation baseball (5oz) during the 2012 and 2014 off-seasons. The normal throwing (NT) group (n=21) participated in normal throwing activities only during the 2013 and 2015 off-seasons. Pre- and Post- training pitch velocities were collected using the Stalker Pro Sport 2 Radar Gun during off-season testing sessions and scrimmages. A 2x2 repeated measures ANOVA was used to determine if differences existed between the two throwing programs and pitch velocity between the two time points. RESULTS: No significant interaction was found between the two groups (WI and NT) and the two time points (pre- and post-offseason). No significant main effect found for time (p=0.07) and no significant main effect for group (p=0.27). The pre- to post-velocity for the WI group was 87.25±2.32 mph and 87.54±2.73 mph, respectively. The pre- to post-velocity for the NT group was 86.800±1.319 mph and 86.99±1.27 mph, respectively. CONCLUSION: The present study found no significant differences in pitch velocity between pre and post off-season testing for the weighted baseball throwing program as compared to a traditional throwing program. This indicates that the implementation of 20% overload and 20% underload throwing did not significantly change pitch velocity amongst collegiate pitchers. With the growing popularity of weighted implementation for throwing sports, further investigation is needed on alternate over/underloads and programming strategies to determine the efficacy for increasing pitch velocity.

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