Evaluation of Two Methods of the Jump Float Serve in Volleyball

• Autores: Sasho MacKenzie, Marc LeVangie, Brett Barro, Kyle Kortegaard
• Localización: Journal of applied biomechanics, ISSN-e 1543-2688, ISSN 1065-8483, Vol. 28, Nº. 5, 2012, págs. 579-586
• Idioma: inglés
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• Dialnet Métricas: 6 Citas
• Resumen

  • 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.