CORRELATIONS BETWEEN JUMP HEIGHT AND VELOCITY COMPONENTS OF DIFFERENT APPROACH STRIDES IN POWER SPIKING

Abstract

The aim of present work was to find correlations between approach velocity components and jump height in power spike. Fourteen top elite volleyball players have been served for this study. A Mikro-Mak Motion Analyzer with Win-Analyze program has been used for 2D study. A Kodak video camera with 240 frames per second has also been used to better trace the markers on the shoulder, hip, knee, ankle, and toe. The program enabled us to find out the displacement and velocity of all parts and especially the hip in order to estimate subjects CG velocity components. Our findings showed that there were significant correlations between vertical component and jump height in all strides; short (r=0.71, ), normal (r=0.70, ), and long strides (r=0.88, ). The highest correlation was achieved for long stride, where the CG of players is more displaced horizontally as well as vertically. There were no meaningful correlations between Height jump and horizontal velocity component and deviation.