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         THE SCIENCE BEHIND         

             THE PROGRAM

The Velocity Development System is unique in that it is based on scientific research and backed by real world results.  What type of results? 

Olympic gold medalists from the following sports have been documented to have used it successfully:

Javelin, shot put, hammer throw, discus, sprinters, swimmers.

Research studies, as well as several current and former major league players, have used the method to increase bat speed and throwing speed dramatically.  I have personally witnessed players add 4 - 6 mph in throwing velocity and 20 - 35 mph in bat speed.

The program is simple, safe, user friendly and most importantly it improves velocity!



Why use Overload – Underload Training:

Put simply, Overload-Underload training is one of the few training methods that has been able to consistently improve an athlete’s performance regardless of the athlete’s ability. 

Overload-Underload Training has produced dramatic improvements in ballistic (explosive) movements dating back to the 1970s, when the former Soviet Union used the exact training method to break numerous track and field records.  Since that time Overload Underload training has been used in numerous sports and has continued to produce tremendous results. 

Overload – Underload training works by improving the athlete’s ability to generate more force (overload) and the ability to generate force at a faster rate (rate of force production [underload]).  Without getting too complex, it’s easy to see that if you can produce more force and produce that higher amount of force at a faster rate of speed, then it can be a huge asset to baseball players.  Numerous (see below) scientific peer reviewed studies have proven overload-underload training to be extremely successful for increasing throwing velocity and bat speed in baseball players. 

Unlike lifting weights, overload-underload training can be used to improve strength and explosiveness in the exact movement patterns an athlete is looking to build (throwing/hitting) as opposed to weight training, where you are strengthening the same muscle groups and hoping to get a carryover effect.  That carryover effect from weight training can be very beneficial at times but science has proven that being able to use the exact motion and movement speed in training is the IDEAL way to improve that movement.

Roger M. Enoka best sums it up in his textbook “Neuromechanical Basis of Kinesiology”

“Training appears to elicit adaptations that are specific to the task, muscle length, and muscle velocity used in the training.  And that highly trained athletes require greater specificity to increase their results.”

Overload-Underload Training allows a player/athlete to train their nervous system more efficiently, which allows for maximum gains.  For once we have a system that is backed both by science and real world results.

                           PROVEN BY SCIENCE - Here are a handful of references

Dr. Coop Derenne's 1990 study of 3 groups showed that, in a simple specific training regime, using overload and underload baseballs, players could dramatically improve throwing velocity. 

* Regulation balls - .88mph increase
* Overweight balls - 3.75 mph increase
* Underweight balls - 4.72 mph increase

Coop DeRenne, Barton P. Buxton, Ronald K. Hetzler and Kwok W. Ho. 1995: Effects of Weighted Bat Implement Training on Bat Swing Velocity. The Journal of Strength and Conditioning Research: Vol. 9, No. 4, pp. 247–250.

Coop DeRenne, Barton P. Buxton, Ronald K. Hetzler and Kwok W. Ho. 1994: Effects of Under- and Overweighted Implement Training on Pitching Velocity. The Journal of Strength and Conditioning Research: Vol. 8, No. 4, pp. 247–250.

David J. Szymanski, MEd, CSCS, June 1998: The Effects of Various Weighted Bats on Bat Velocity - A Literature Review.  Strength and Conditioning, pp. 8 - 11 

Coop DeRenne, Kwok W. Ho and James C. Murphy. 2001: Effects of General, Special, and Specific Resistance Training on Throwing Velocity in Baseball: A Brief Review. The Journal of Strength and Conditioning Research: Vol. 15, No. 1, pp. 148–156.

Coop DeRenne, Kwok Ho and Alan Blitzblau. 1990: Effects of Weighted Implement Training on Throwing Velocity. The Journal of Applied Sport Science Research, 4, 16-19.

DeRenne, C., Tracy, R., and Dunn-Rankin, P. 1985: Increasing Throwing velocity.  Athletic Journal, April, 36 - 39.

Bagonzi, J. A. 1978:  The Effects of Graded Weighted Baseballs, Free Weight Training, and Simulative Isometric Exercise on the Velocity of a Thrown Baseball.  Master's thesis, IndianaUniversity.  

Litwhiler, D., and Hamm, L. 1973:  Overload: Effect on Throwing Velocity and Accuracy.  Athletic Journal, 53, 64-65.

Brose, D.E., and D.L. Hanson 1967:  Effects of Overload Training on Velocity and Accuracy of Throwing.  Research Quarterly. 38:528-533.

Egstrom, G.H., Logan, G.A., and E. L. Wallis 1960:  Acquisition of Throwing skill Involving Projectiles of varying Weight.  Research Quarterly 31:420-425. 

Rafael F. Escamilla1, Ph.D., Glenn S. Fleisig2, Ph.D., Steven W. Barrentine2, M.S., James R. Andrews2, M.D., and Kevin P. Speer, M.D.  Effects of throwing overweight and underweight baseballs on throwing velocity and accuracy.  Sports Med. 2000 Apr;29(4):259-72