Evaluation of two methods of the jump float serve in volleyball
(Auswertung von zwei Methoden der Sprung-Flatteraufgabe im Volleyball)
A novel jump-focused (JF) technique of the jump float serve was compared with the conventionally used contact-focused (CF) method. Seven elite male (height: 195 ± 6 cm) and two elite female (height: 181 and 182 cm) volleyball players were videoed at 60 Hz performing both techniques. Horizontal and vertical ball contact coordinates, pre- and postcontact ball velocities, and initial projection angles were determined. The JF technique resulted in a significantly higher mean contact height, t(8) = 4.12, p = .006, d = 0.72, initial serve speed, t(8) = 4.71, p = .006, d = 2.03, and significantly flatter initial projection angle, t(8) = 2.53, p = .036, d = 0.63, relative to the CF technique. The precontact vertical ball velocity was also significantly higher, t(8) = 8.04, p = .004, d = 2.86. The higher precontact vertical ball velocity suggests it is more difficult to make accurate contact with the ball during the JF technique. However, this method promotes a more favorable ball trajectory and a greater initial serve speed. When combining the random lateral movement patterns inherent in any float serve, with the reduced flight time associated with the JF technique, a more challenging passing scenario can be presented to the defensive team in comparison with the current CF technique.
© Copyright 2012 Journal of Applied Biomechanics. Human Kinetics. Alle Rechte vorbehalten.
| Schlagworte: | |
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| Notationen: | Naturwissenschaften und Technik Spielsportarten |
| Veröffentlicht in: | Journal of Applied Biomechanics |
| Sprache: | Englisch |
| Veröffentlicht: |
2012
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| Online-Zugang: | https://doi.org/10.1123/jab.28.5.579 |
| Jahrgang: | 28 |
| Heft: | 5 |
| Seiten: | 579-586 |
| Dokumentenarten: | elektronische Zeitschrift |
| Level: | hoch |