| Summary: | 碩士 === 國立陽明大學 === 物理治療暨輔助科技學系 === 101 === Background: Serve plays an important role in volleyball games. Not only can a serve score directly, but also destroy the attack of the opponent team. Quality of the serve depends on its velocity and position which are two of the main focuses in volleyball players’ training nowadays. Previous study demonstrated that a higher serving velocity was linked with higher body height, thicker skin fold and higher competitive level. Researches also identified some factors relating to serve performance, such as body weight and in-game role. However, the relationships of the muscular and physiological factors to serve performance and are still unclear. Objectives: To identify the differences of muscular and physiological factors and serve performance between female volleyball specialized group and regular male and female volleyball players. To determine the correlation of muscle performing factors and physiological characteristics with serve performance in collegiate volleyball players.
Design: Cross sectional exploratory design. Methods: 52 collegiate volleyball players are recruited. We divided them into 3 groups （female volleyball specialized group, FSG; regular male player group, RMG; regular female players group, RFG）. We recorded their gender, height, weight, train¬ing time, practicing-volleyball experience and in-game role, and assessed their ROM, flexibility and isometric muscle strength of shoulder, elbow and trunk. Velocity and accuracy of their volleyball serving were also be measured. Statistical analysis: One-way ANOVA was used to analyze the between group differences of serve performance, muscle performance and physiological characteristics. We divided players into 2 the high serving speed group and low serving speed group; and into accurate serving group and non-accurate serving group. We used independent t test to identify potential predicting factors between each part of the two groups. Variables that showed a group difference at p<0.1 entered into a stepwise linear regressions analysis to establish the prediction model for serve performance. The statistical significant levels were set at α < 0.05. Results: FSG and RMG’ s height, body weight and serving speed were significant higher than RFG, but serving accuracy, BMI and FMS score were similar between three groups. FSG’s experiences were longer than the other groups, but more shoulder flexion limitation, either. RMG’s shoulder internal rotation limitation was significant larger than RFG. RMG’s muscle strength was significant larger than RFG except lower trapezius. The throwing distant was similar between FSG and RMG and longer than RFG. The COP excursions of RMG were significant larger than the other two groups. Serving speed used 54 as the cut-off point, throwing distant of the medicine ball was a positive indicator for serving speed (β=0.578, p=0.001, R2 =0.335) . For the serving accuracy, we found the experience of playing volleyball was closely related to the serving accuracy (β=0.554, p=0.001, R2 =0.307). Conclusion: FSG and RMG had similar physiological characteristics, muscle performance and serving speed, and those performance were significant better than RFG. FSG’s experiences of playing volleyball were significant higher than RMG and RFG. The serving accuracy and functional movement screen test score were without statistical differences between three groups. The throwing distant of medicine ball was related to serving speed and experience of playing volleyball was related to serving accuracy. There were little difference of single muscle strength between FSG and RFG, but significant in the overhead throwing medicine ball and experience. But the effects of medicine ball throwing in volleyball training still unclear, need more experiments to identify.
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