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An assessment of a volleyball player’s loads in a match on the basis of the number and height of jumps measured in real-time conditions

100%

Wnorowski K., Aschenbrenner P., Skrobecki J., Stech M.

Background: The value of volleyball players’ reach is often critical to their efficient functioning in the game. It depends on the jumping ability factor and the player’s body build. An analysis of this parameter is particularly difficult to carry out in real conditions of the game. The objective of the research was to determine the height of reach in basic technical and tactical actions of leading Polish volleyball players during a match in regard to their maximum values measured in laboratory conditions. Material/Methods: The study involved five volleyball players, Polish representatives of different specialization in the game: the attacker, the setter, the middle blocker and two receivers. The study made use of a camcorder and an innovative computer program AS-4, which enables measuring the value of reach at which tactical and technical actions are carried out in the game. Results: A total of 378 tactical and technical actions of the tested players were registered. It turned out that they were performed at the level of (reach) 87.4% in comparison to the maximum reach measured in laboratory conditions. Conclusions: Values of reach achieved by the tested volleyball players have a significant, positive correlation with results obtained in individual sets. The values closest to the value of the maximum reach were reported in attack, the lowest ones in setting.

The Effect of a 6-Week Plyometric Training on Explosive Power in Volleyball Players

88%

Jastrzebski Z., Wnorowski K., Mikolajewski R., Jaskulska E., Radziminski L.

Baltic Journal of Health and Physical Activity

2014

vol. 6

issue 2

79-89

Background: The purpose of the present study was to determine the effects of a six-week plyometric high and low-intensity training on the explosive power of lower limbs in volleyball players. Material/Methods: The research was conducted on a sample of 30 volunteers of the Sports Club at Gdansk University of Technology in Gdansk. Before the experiment, the players were divided into two homogeneous groups. After two weeks of an introductory common stage, each group followed a plyometric regime of different intensity. The results showed that the high-intensity program was more efficient than the low-intensity program in developing the explosive power in the volleyball players. Results: The largest significant improvement was observed for the vertical jump with arm swing (11% in HIJG and 3.8% in LISG). The strongest correlations were registered for the maximal power and the total mechanical work obtained in the Wingate test (r=0.83), and the power of jumps during attacks and blocks (r=0.78). Conclusions: The experiment confirmed high effectiveness of the training loads applied in the experiment, in particular in the high-intensity program.

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2 Baltic Journal of Health and Physical Activity

1 2014

1 2013

2 Wnorowski K.

1 Aschenbrenner P.

1 Jaskulska E.

1 Jastrzebski Z.

1 Mikolajewski R.

1 Radziminski L.

1 Skrobecki J.

1 Stech M.

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An assessment of a volleyball player’s loads in a match on the basis of the number and height of jumps measured in real-time conditions

The Effect of a 6-Week Plyometric Training on Explosive Power in Volleyball Players