Discussion
ACL injury, quadriceps muscle activityThe, TTP, muscle reduced the reaction
TTP, CONTRACTION
This study examined the influence of a 4-week plyometric training on neuromuscular and Ergo-jump characteristics' in different phases of a one-leg drop jump in active girls. The present study showed that the TTP in the plyometric training group compared to the control group in the PR phase showed a significant decrease in the RF muscle. The TTP of the RF muscle in the PR phase, after 4 weeks of plyometric training, decreased by 18% compared to the control group. It means that after training, the RF muscle reduced the reaction time of muscle contraction. Previous studies, such as Chang et al. showed that the time to peak decreases after plyometric training in childrenAlso, the results of this research showed that there was no significant difference between the two groups at the Onset time. Despite this, the Onset time decreased from pre to post-training in both groups. It was also shown in the present study that the Activity Time differs between the two groups in the TA muscle. The results of other studies suggest that female athletes have a higher risk of ACL injury during jump landing due to increased TA translation force with quadriceps muscle activityThe research results showed no significant difference between the two groups in Ergo-jump variables. In contrast, other studies have shown that Plyometric training improves performance and maintains explosive strength parametersResults of the current research showed that using the plyometric training in female training programs reduces the maximum landing forces and leads to fewer ACL injuries