2019, Volume 15, Issue 1
Jump height of volleyball players across the league season
Jarosław Jaszczur-Nowicki1, Joanna M. Bukowska2, Karolina Lemanek3, Jarosław Klimczak3, Dariusz Kruczkowski4
1Turystyka, Rekreacja i Ekologia, Uniwersytet Warmińsko-Mazurski w Olsztynie, Olsztyn, Poland
2Turystyka, Rekreacja i Ekologia, Uniwersytet Warmińsko-Mazurski, Olsztyn, Poland
3Turystyki, Rekreacji i Ekologii, Uniwersytet Warmińsko-Mazurski, Olsztyn, Poland
4Elblaska Uczelnia Humanistyczno-Ekonomiczna, Elbląg, Poland
Author for correspondence: Jarosław Jaszczur-Nowicki; Turystyka, Rekreacja i Ekologia, Uniwersytet Warmińsko-Mazurski w Olsztynie, Olsztyn, Poland; email: firstname.lastname@example.org
Background & Study Aim: Volleyball is a sport that requires movements commonly regarded as dynamic with one of the most important factors in this discipline being jump height. The schedule of the league season, with its most important matches, heavily influences the jump height of the players. Of particular interest was the difference in jump height before the beginning of the season and at its final stage. The study aimed was knowledge about the jump height of volleyball players before the season and in the final phase of the league games and possible changes in the level of motor coordination associated with jumping.
Material & Methods: The study involved 12 men aged between 18 and 23 years training in the minor-league volleyball team of the Sports Club of the Academic Sports Association at the University of Warmia and Mazury in Olsztyn, Poland. Each time a participant made two standing jumps. The first jump was a counter movement jump (CMJ). The second one was a counter movement jump with arms swing (CMJ+B). The study was divided into two parts, before and during the final phase of the season. A motion sensor (WIVA® system) was used to analyse the jump.
Results: No statistically significant differences were found for the CMJ trials. Unlike CMJ+B, where statistically significant differences were found for one of the most important indicators for volleyball players, i.e. explosive power (p=0.0414), and also in a indicator called coordination % (p = 0.002) which is decisive for performance in volleyball.
Conclusions: The juxtaposition of CMJ+B and coordination % indicators, which showed statistically significant differences, is indicative of a significant improvement in the physical fitness of the examined volleyball players and may be important for success in volleyball. It confirms the directly proportional relationship between the manifestation of muscle strength and neuromuscular coordination.
Key words: explosive power, coordination, centre of gravity, kinematic chain, various motor skills