The physical effort in the defensive phase of volleyball games: comparison among positional roles Introduction The number of jumps performed by players during a game is a commonly used parameter when defining the physical loading in volleyball1,2. The aim of this study is to compare the jumping performance in volleyball players of different roles, focusing the analysis on the defensive phase of the game, characterized by jumps aimed to serve, block and eventually counterattack. A similar number of jumps is hypothesized to be between opposite-role players due to similarities in their technical characteristics. Methods 3 volleyball games (15 sets) of a top level male team were considered. Data were collected with the Data Video system (Dataproject s.r.l., Bologna, Italy). The jumps were subdivided in serving, blocking and counterattacking (spiking) jumps. The mean jump number for game of each category was analysed with Chi-square tests with the level of significance set at 0.05. Comparisons were made respectively between the setter (P) vs. the opposite (O), the two hitters (S1 - S2) and the two middle blockers (C1 - C2). Results Table 1: Comparison between role and position in the defensive phase Position SERVE BLOCK SPIKE Mean ± S.D. % Mean ± S.D.. % Mean ± S.D. % C1 15.0±1.0 24.5 12.0±2.6 69.0 4.0±2.6 6.5 C2 14.7±0.6 23.0 12.0±1.0 71.1 3.3±3.5 5.2 S1 24.0±0.6 43.6 8.0±4.0 48.5 4.3±0.6 7.9 S2 20.0±11.1 38.5 5.7±3.1 48.7 6.7±1.5 12.8 P 18.3±6.5 35.3 9.0±1.0 42.3 1.0±0.0 1.1 O 21.0±3.0 43.8 8.0±2.6 44.0 5.7±5.0 11.8 Discussion Chi-square tests showed a significant difference between the number of jumps performed by the setter (P) and the opposite (O) when spiking and setting. Discussion/Conclusion The innovation of this pilot study is to analyze the jumping performance specifically in the defensive phase of the volleyball game. The difference shown between the setter and the opposite may be due to the different task they have to perform in the transition from defense to counterattack. Using the most popular line-up system, called the 5-1, the setter is the responsible of every second touch, then his aim is to transform the defence into counterattack. Indeed, the opposite in many teams is the primary hitter, attacking equally from the front and the back row. References 1. Fontani, G., Ciccarone, G. et al. (2000) SDS-Rivista di cultura sportiva. 50:14-20. 2. Tillman, M.D., Hass, C.J. et al. (2004) Journal of sports science and medicine. 3:30-36.
Castelli E., Tomasini A., De Lellis J.C., Lobietti R. (2008). The physical effort in the defensive phase of volleyball games: comparison among positional roles.
The physical effort in the defensive phase of volleyball games: comparison among positional roles
LOBIETTI, ROBERTO
2008
Abstract
The physical effort in the defensive phase of volleyball games: comparison among positional roles Introduction The number of jumps performed by players during a game is a commonly used parameter when defining the physical loading in volleyball1,2. The aim of this study is to compare the jumping performance in volleyball players of different roles, focusing the analysis on the defensive phase of the game, characterized by jumps aimed to serve, block and eventually counterattack. A similar number of jumps is hypothesized to be between opposite-role players due to similarities in their technical characteristics. Methods 3 volleyball games (15 sets) of a top level male team were considered. Data were collected with the Data Video system (Dataproject s.r.l., Bologna, Italy). The jumps were subdivided in serving, blocking and counterattacking (spiking) jumps. The mean jump number for game of each category was analysed with Chi-square tests with the level of significance set at 0.05. Comparisons were made respectively between the setter (P) vs. the opposite (O), the two hitters (S1 - S2) and the two middle blockers (C1 - C2). Results Table 1: Comparison between role and position in the defensive phase Position SERVE BLOCK SPIKE Mean ± S.D. % Mean ± S.D.. % Mean ± S.D. % C1 15.0±1.0 24.5 12.0±2.6 69.0 4.0±2.6 6.5 C2 14.7±0.6 23.0 12.0±1.0 71.1 3.3±3.5 5.2 S1 24.0±0.6 43.6 8.0±4.0 48.5 4.3±0.6 7.9 S2 20.0±11.1 38.5 5.7±3.1 48.7 6.7±1.5 12.8 P 18.3±6.5 35.3 9.0±1.0 42.3 1.0±0.0 1.1 O 21.0±3.0 43.8 8.0±2.6 44.0 5.7±5.0 11.8 Discussion Chi-square tests showed a significant difference between the number of jumps performed by the setter (P) and the opposite (O) when spiking and setting. Discussion/Conclusion The innovation of this pilot study is to analyze the jumping performance specifically in the defensive phase of the volleyball game. The difference shown between the setter and the opposite may be due to the different task they have to perform in the transition from defense to counterattack. Using the most popular line-up system, called the 5-1, the setter is the responsible of every second touch, then his aim is to transform the defence into counterattack. Indeed, the opposite in many teams is the primary hitter, attacking equally from the front and the back row. References 1. Fontani, G., Ciccarone, G. et al. (2000) SDS-Rivista di cultura sportiva. 50:14-20. 2. Tillman, M.D., Hass, C.J. et al. (2004) Journal of sports science and medicine. 3:30-36.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
