## 4 Discussion  
The results obtained from the Spike Jump Test indicate that both training methodologies led to improvements in the vertical jump performance of volleyball players. The difference in jump height gains between the two groups is approximately 1.76 cm, with the EXP group achieving a greater relative improvement of 6.9% (from 30.14 cm at the pre-test to 32.22 cm at the post-test) compared to the CON group, which showed a modest improvement of 1.1% (from 28.06 cm at the pre-test to 28.38 cm at the post-test). These findings are consistent with the existing literature, which highlights the effectiveness of pyometric training in enhancing explosive power. Previous studies have reported similar trends, emphasizing the superiority of pyometric protocols over traditional strength-based approaches for jump performance enhancement. Research conducted by [PERSON] et al. [26] on under-16 volleyball players reported significant enhancements in vertical jump ability after one month of pyometric training. [PERSON] et al. [27] observed similar improvements in handball players, while [PERSON] et al. [28] demonstrated that a six-week pyometric training program significantly enhanced neuromuscular performance in soccer players. Collectively, these studies and the current findings suggest that pyometric training is an effective method for improving vertical jump ability across various sports. The responses to the perception survey further reinforce the differences observed between the two groups. Athletes in the EXP group reported greater awareness of the benefits of the pyometric protocol. Specifically, they indicated an improvement in vertical jump performance and expressed a higher perception of achievement compared to previous training methodologies. The perception scores in the EXP group increased from a mean of 3.33 on the pre-test to 4.16 at the post-test, reflecting a positive shift in their self-assessment and motivation. In contrast, the CON group showed relatively stable perceptions over time, with minimal changes in their self-reported awareness or perceived performance gains. Their perception scores remained constant at 3.08 across all time points (pre, mid, and post), suggesting no significant change in their belief about the effectiveness of their training. Comparing the results of the perception survey, the EXP group demonstrated a significant increase in their perception scores, with a mean increase from 3.33 at pre-test to 4.16 at post-test (a change of approximately 0.83 points), which aligns with the substantial performance gains observed in the vertical jump test. This reflects the athletes' growing \begin{table}
\begin{tabular}{c c c c c} \hline \hline
**Variable** & \(\chi^{2}{{}_{F}}\) & _p-Value_ & **Comparison** & _p-Value_ \\ \hline \multirow{4}{*}{EXP} & \multirow{4}{*}{10.24} & \multirow{4}{*}{0.00} & Pre vs. Mid & 0.60 \\ \cline{3-5}  & & & Pre vs. Post & 0.01 \\ \cline{3-5}  & & & Mid vs. Post & 0.01 \\ \hline \multirow{4}{*}{CON} & \multirow{4}{*}{2.09} & \multirow{4}{*}{0.35} & Pre vs. Mid & 0.42 \\ \cline{3-5}  & & & Pre vs. Post & 0.30 \\ \cline{3-5}  & & & Mid vs. Post & 0.57 \\ \hline \hline \end{tabular}
\end{table} 
Table 7: [PERSON] test results and post hoc analysis for athlete perceptions. awareness of their progress and their increased confidence in the training's effectiveness. In contrast, the CON group showed no significant change in perception scores, with a stable mean score of 3.08 across all time points. This discrepancy could suggest that the EXP group not only benefited from physical improvements but also felt more motivated and engaged in the training process, possibly due to the novelty and intensity of the pyometric exercises. It is essential to acknowledge that the specificity of the pyometric protocol, which focused on targeted high-impact exercises, may have shaped the athletes' expectations and potentially induced a placebo effect. This psychological influence could have amplified the perceived effectiveness of the training, thereby affecting the study's outcomes.