Correlation between some biostatic and dynamic parameters of jumping and their effects on smash performance of volleyball players

Abstract EN

The material of this work comprised 10 male players selected at random form the players of the Main Volleyball Team of the Alexandria Union Club during the period 1997-1998.

A complete clinical examination of the musculo-skeletal system was performed to ensure the absence of any overt neuro-muscular or joint disease.

The following tests were carried out for each of the studied cases : stability parameters (Core area size-CBM on the X and Y axes) by using MTI-force platform.

Determination of the biodynamic profile of the smash jump phase (power, total force and time of work) and determination of the practical performance smash technique.

Statistical analysis of the effects of the different personal characteristics on the performance of smash proved that the performance during jumping phase is an important factor in determination of smash outcome.

The best knee flexion angle prior to jumping is (60-90) degree, as the distance of jumping after (60-90) knee flexion provided adequate lower extremity muscular contractions that generate the maximum force with minimal increase in the jumping distance.

On the other hand the force generated following (60-90) degree knee flexion is characterized by being of maximal vertical component and minimal horizontal component that allow maximum benefit of the force generated.

The biostatic parameters (core area size and CBM) as well as the body weight are very important factors that influence the smash outcome.

Age and height were not a major factor in the determination of smash performers.

This is another important result proved throughout this work and should be kept into consideration in choosing the smash performers.