Abstract details
| Abstract-ID: | 575 |
| Title of the paper: | Ball Velocity and Spin Rate in Volleyball Jump Serves |
| Authors: | Asai, T., Nakanishi, Y., Suita, M., Nakayama, M., Kurosaki, E., Kimachi, K., Ozaki, H., Hong, S. |
| Institution: | Faculty of Physical Education |
| Department: | International Pasific University |
| Country: | Japan |
| Abstract text | INTRODUCTION: In volleyball jump serves, ball speed and spin rate are critical technical factors influencing serve effectiveness (1). A high-speed ball and effective spin can increase the difficulty of reception and enhance scoring potential (2). Previous research has reported that the mean ball speed of a jump topspin serve in a men’s Olympic qualifying tournament was 23.03 ± 3.94 m/s, which was significantly faster and more effective than a float serve (3). While topspin causes the ball to drop sharply, making reception more challenging (1), little is known about the characteristics of ball speed and spin rates across different jump serve types, including the jump float serve, jump drive (topspin) serve, and jump hybrid (sidespin) serve. METHODS: A highly skilled female collegiate volleyball player (12+ years of experience, national team member) performed 10 trials of each serve type on a standard volleyball court. A 3D motion capture system was used to analyze ball speed and spin rate immediately after hand contact. A one-way ANOVA with Bonferroni correction was applied to compare serve types. RESULTS: Jump float serves had the lowest ball speed (18.5 ± 0.5 m/s), while jump drive (21.5 ± 0.7 m/s) and jump hybrid serves (20.5 ± 0.7 m/s) were significantly faster (p < 0.05). The vertical spin rate was significantly higher in jump drive (2.6 ± 0.6 rps) and jump hybrid serves (2.5 ± 1.4 rps) compared to jump float serves (0.1 ± 0.6 rps, p < 0.05), with no significant difference between drive and hybrid serves. The jump hybrid serve had a significantly higher horizontal spin rate (3.3 ± 1.0 rps) than the other serves (p < 0.05). CONCLUSION: This study highlights distinct differences in ball speed and spin characteristics across jump serve types. The greater ball speed in jump drive and jump hybrid serves suggests enhanced force transmission at impact. The presence of topspin in the jump hybrid serve, despite its sidespin characteristics, indicates a unique rotational dynamic. Additionally, the significantly higher horizontal spin in the jump hybrid serve suggests a distinct trajectory variation due to sidespin effects. REFERENCES: 1) Bhasi & Sadanandan, Int J Phys Educ Sports Health, 2022 2) Häyrinen et al., Br J Sports Med, 2011 3) Moras et al., J Sports Med Phys Fitness, 2008 |
| Topic: | Coaching |
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