Effects of ballistic training on preseason preparation of elite volleyballplayers

Purpose: The purpose of this study was to determine whether ballistic resis tance training would increase the vertical jump (VJ) performance of already highly trained jump athletes. Methods: Sixteen male volleyball players fro m a NCAA Division I team participated in the study. A Vertec was used to me asure standing vertical jump and reach (SJR) and jump and reach from a thre e-step approach (AJR). Several types of vertical jump tests were also perfo rmed on a Plyometric Power System and a forceplate to measure force, veloci ty, and power production during vertical jumping. The subjects completed th e tests and were then randomly divided into two groups, control and treatme nt, All subjects completed the usual preseason volleyball on-court training combined with a resistance training program. In addition, the treatment gr oup completed 8 wk of squat jump training while the control group completed squat and leg press exercises at a 6RM load. Both groups were retested at the completion of the training period. Results: The treatment group produce d a significant increase in both SJR and AJR of 5.9 +/- 3.1% and 6.3 +/- 5. 1%, respectively. These increases were significantly greater than the pre- to postchanges produced by the control group, which were not significant fo r either jump. Analysis of the data from the various other jump tests sugge sted increased overall force output during jumping, and in particular incre ased rate of force development were the main contributors to the increased jump height. Conclusions: These results lend support to the effectiveness o f ballistic resistance training for improving vertical jump performance in elite jump athletes.