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Comparison of Three Baseball Specific Six-Week Training Programs on Trunk Strength and Power in High School Baseball Players: 3341 May 31, 915 AM - 930 AM

Escamilla, Rafael F. FACSM1; Ionno, Michele2; deMahy, Scott3; Fleisig, Glenn S.4; Wilk, Kevin E.5; Yamashiro, Kyle6; Mikla, Tony7; Paulos, Lonnie8; Andrews, James R.9

Medicine & Science in Sports & Exercise: May 2014 - Volume 46 - Issue 5S - p 887
doi: 10.1249/01.mss.0000496163.16682.c7
G-29 Free Communication/Slide - Enhancing Performance through Training Interventions Saturday, May 31, 2014, 9:00 AM - 10:45 AM Room: 305

1California State University, Sacramento, Sacramento, CA. 2Texas Tech University, Lubbock, TX. 3Andrews Institute rehabilitation, Gulf Breeze, FL. 4American Sports Medicine Institute, Birmingham, AL. 5Champion Sports Medicine, Birmingham, AL. 6Results Physical Therapy and Training Center, Sacramento, CA. 7Athletes Performance, Phoenix, AZ. 8Paulos Sports Injury and Joint Preservation Clinic, Salt Lake City, UT. 9Andrews Research and Education Institute at the Andrews Institute, Gulf Breeze, FL.

(No relationships reported)

PURPOSE: Because training or rehabilitating an athlete involves a progression of training programs specific to the athletes sport, it is important to understand how different training programs effect performance and minimize injury risk. Because enhancing trunk strength & power may enhance performance and decrease injury risk in baseball players, this study compared the effects of 3 baseball-specific 6-week training programs on trunk strength & power.

METHODS: Sixty-eight high school baseball players (14-17 yo) were randomly & equally divided into 3 training groups & a non-training control (CON) group. The 3 training groups were the Throwers Ten (TT) (slower controlled motion exercises using body weight, dumbbells, & tubing), Keiser Pneumatic (KP) (explosive motion exercises using constant air resistance machines), & Plyometric (PLY) (explosive motion exercises using 4-8 lb medicine balls & tubing). Each training group trained 3 days/week for 6 weeks, comprised of a 5-10 min warm-up & cool-down and 45 min of resistance training (2 sets of 6-12 reps). At the beginning and end of the training session, trunk strength & power were assessed in the 3 training groups and CON group during rotational and overhead maximum efforts 3 lb and 6 lb medicine balls throws for distance, as well as prone plank and side plank isometric holds for time. A two-factor repeated measures analysis of variance was used to assess strength & power differences (p < 0.05).

RESULTS: All 3 training groups had significantly greater increases in trunk strength & power after the 6 week training program, demonstrating approximately 10-25% greater trunk strength during the prone and side plank tests and approximately 10-15% greater trunk power during the rotational and overhead medicine ball tests. There were no significant differences in all trunk strength and power pre-test and post-test values in the CON group.

CONCLUSIONS: All 3 training programs, but not the CON group, were effective in increasing trunk strength and power. Overall, the TT group was most effective in increasing trunk strength, while the KP & PLY groups were most effective in increasing trunk power. As high school baseball players develop into stronger & more powerful athletes, the risk of injury may decrease and their performance may increase.

© 2014 American College of Sports Medicine