ABSTRACT
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: ) were analyzed. RESULTS: Significant differences (P<0.05) of values of the dynamic parameters (Rmax, ) 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.Subject(s)
Athletes
, Athletic Performance/physiology
, Isometric Contraction/physiology
, Knee Joint/physiology
, Physical Endurance/physiology
, Plyometric Exercise
, Volleyball
, Adult
, Biomechanical Phenomena
, Female
, Humans
, Muscle Strength/physiology