# Effects of Agility Training on Skill-Related Physical Capabilities in Young Volleyball Players
## 4 Discussion  
The findings revealed that the STG showed significant improvements in all three tests, which were 6.10% (DAT), 2.64% (agility _T_-test), and 5.68% (10 MS), and performed significantly better than the CG. In terms of the ATG, the improvements were 4.05% (DAT), 3.28% (agility _T_-test), and 3.27% (10 MS), but only the 10 MS was significantly better than the other tests for the CG. For the CG, the improvements were 0.68% (DAT), 0.25% (agility _T_-test), and 0.47% (10 MS). The results show that the performance of the STG was the most effective. The main reason is that when the intervention was applied to the STG in the six-week 2 m shift training, the athletes used the hip-knee-ankle movement pattern to carry out left-right shifts. At the beginning of the movement, between the shift of the center of gravity of the feet, the muscles first contracted centrifugally and stored elastic potential energy, followed by rapid centripetal contraction, which triggered the stretch reflex and increased the speed of muscle contraction, allowing the stored elasticity to be released and increasing the performance of muscle strength [26]. The 2 m shuttle used in this study usually involves explosive training patterns, such as quick stops, fast starts, and changes in the direction of movement, in the same way as augmentation training, and can therefore be used to assist in the development of agility in young female athletes. Several studies have indicated that agility training can provide performance advantages to the athletes in 10 m, 20 m sprint performance [22] and vertical jump simple reaction time tests [8]. [PERSON] et al. [22] reported that the 6-week agility ladder training provides 2.54% enhancement on 10 m sprinting. [PERSON] et al. [10] pointed out that the workload of a skill-based training program should be appropriate to improve the players' adaptability and achieve enhanced sports performance. In their researches [5,10], pylemotic training was applied to the training program, which involves the features of agility. The studies showed that the college male volleyball players improved the results of the agility _T_-test by 2.01-2.68%. These researches reported similar results to this study and provided positive evidence for the agility training effects. Increasing muscle flexibility improves the stretch-shortening cycle and neural coordination during rapid contraction. This significantly enhances the player's agility to achieve the characteristics of the stretch reflex and muscle elasticity energy conversion, increase the unit of movement, establish a good response mechanism, increase the speed of the player's left-right shifts, heighten the defensive save rate, and enable the player to have an excellent defensive ability, respond randomly to various conditions on the court, and meet the demands of court movements by quickly changing attack and defense positions and \begin{table}
\begin{tabular}{c c c c c c c c} \hline \hline
**Item** & **Group** & **Pre-Test (CV)** & **ICC** & **Post-Test (CV)** & **ICC** & **F** & \(p\)**-Value** \\ \hline \multirow{4}{*}{DATs} & STG & 1.48 \(\pm\) 0.08 (5.41\%) & 0.95 & 1.39 \(\pm\) 0.09 (6.48\%) & 0.89 & \multirow{4}{*}{5.512} & \multirow{4}{*}{0.012} \\  & ATG & 1.48 \(\pm\) 0.05 (3.38\%) & 0.95 & 1.42 \(\pm\) 0.04 (2.82\%) & 0.92 & & \\  & CG & 1.48 \(\pm\) 0.06 (4.05\%) & 0.89 & 1.47 \(\pm\) 0.06 (4.08\%) & 0.90 & & \\  & STG & 11.74 \(\pm\) 0.32 (2.73\%) & 0.81 & 11.43 \(\pm\) 0.30 (2.62\%) & 0.89 & & \\ \(T\)-test & ATG & 12.21 \(\pm\) 0.34 (2.78\%) & 0.91 & 11.81 \(\pm\) 0.37 (3.13\%) & 0.86 & 4.336 & 0.021 \\  & CG & 11.84 \(\pm\) 0.33 (2.79\%) & 0.87 & 11.81 \(\pm\) 0.36 (3.05\%) & 0.82 & & \\  & STG & 2.11 \(\pm\) 0.12 (5.69\%) & 0.96 & 1.99 \(\pm\) 0.12 (6.03\%) & 0.97 & & \\
10 MS & ATG & 2.14 \(\pm\) 0.07 (3.27\%) & 0.94 & 2.07 \(\pm\) 0.06 (2.90\%) & 0.90 & 30.710 & 0.000 \\  & CG & 2.14 \(\pm\) 0.16 (7.48\%) & 0.90 & 2.13 \(\pm\) 0.11 (5.16\%) & 0.87 & & \\ \hline \hline \end{tabular}
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