The relationship between selected kinematic parameters and the speed of the jump topspin serve in men's volleyball
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| Year of publication | 2022 |
| Type | Appeared in Conference without Proceedings |
| MU Faculty or unit | |
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| Description | This article focused on the relation between selected kinematic parameters of spike serve regarding the speed of a flying ball in men's volleyball. 10 players of the elite senior category in real conditions performed one measured spike serve at submaximal speed during training. All serves were performed following the rules of volleyball. The average speed of the recorded serves was 94.7 ± 5.22 km/h. 6 high-frequency cameras measured kinematic variables during the measurement of the spike serve in the 100 Hz recording mode (Simi Motion - technology). In this article, we focused on comparing the serve speed with the wrist height of the hitting arm at the time of the strike. Furthermore, to compare the speed of the serve with the height of the centre of gravity of the serving player (calculated according to Gubitz) at the time of the strike. And the last relation we looked for was the serve speed and the length of the serving player's flight phase. This parameter was calculated from the centre of gravity trajectory (according to Gubitz) from the moment of the player's jump from the ground (pad) to the moment of hitting the ball. Pearson's correlation coefficient was used for statistical processing of serve speed and kinematic parameters. The resulting correlation between the serve speed and the wrist height of the hitting arm r = 0.03, i.e., a very trivial association. The correlation between the serve speed and the height of the centre of gravity at the moment of the strike is large, r = 0.5. Similarly, the correlation coefficient r = 0.52 was obtained in the case of the relation between the serve speed and the length of the flight phase of the center of gravity, so in this case, it is a large degree of correlation. We presume the data obtained could contribute to volleyball coaches (primarily male category) in developing this complex player skill. Information about the relation between the serve speed and the length of the flight phase of the serving player is beneficial. |
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