ORIGINAL ARTICLE  EXERCISE PHYSIOLOGY AND BIOMECHANICS 

The Journal of Sports Medicine and Physical Fitness 2016 December;56(12):1482-7

Copyright © 2016 EDIZIONI MINERVA MEDICA

lingua: Inglese

A comparison of take-off dynamics during three different spikes, block and counter-movement jump in female volleyball players

Jaroslae KABACINSKI ¹, Lecholslaw B. DWORAK ^{2, 3}, Michal MURAWA ¹, John OSTARELLO ⁴, Agata RZEPNICKA ¹, Jacek MACZYNSKI ¹ ✉

¹ Department of Biomechanics, University School of Physical Education, Poznan, Poland; ² Department of Bionics, University of Arts, Poznan, Poland; ³ Department of Rheumatology and Rehabilitation, Poznan University of Medical Sciences, Poznan, Poland; ⁴ Department of Kinesiology, California State University, East Bay, Hayward, CA, USA

BACKGROUND: The purpose of the study was to compare the take-off dynamics in counter-movement jump (CMJ), volleyball block and spikes.
METHODS: Twelve professional female players, representing the highest volleyball league in Poland, participated in the laboratory tests. A force platform was used to record ground reaction force (GRF) during take-off phase in CMJ test, block from a run-up and spikes: front row attack, slide attack, back row attack. Vertical (v) GRF (peak: Rmax and integral mean: ), impulse of vGRF (J) and mechanical power (peak: Pmax and integral mean: < P >) were analyzed.
RESULTS: Significant differences (P<0.05) of values of the dynamic parameters (Rmax, < R >, J, Pmax, and < P >) were found between CMJ, block from a run-up and three different technique spikes. The highest values were recorded during take-off in the back row attack: peak vGRF (2.93±0.05 BW), integral mean vGRF (1.90±0.08 BW), impulse of vGRF (354±40 Ns), peak power (5320±918 W) and integral mean power (3604±683 W). Peak power (2608±217 W) and integral mean power (1417±94 W) were determined in CMJ test to evaluate the force-velocity capabilities of the players.
CONCLUSIONS: In terms of GRF and the mechanical power, high level of dynamics in take-off influences positively the jumping height and significantly increases the effectiveness of attacks during spike of the ball over the block of the opponent.

KEY WORDS: Volleyball - Female - Athletic performance