Effect of Six Weeks of Hopping Training on Dynamic Stability of Volleyball Players with Functional Ankle Instability with Emphasis on the Time to Stabilization

The aim of the current study was to investigate the effect of six weeks of hopping training on the dynamic balance of volleyball players with Functional Ankle Instability(FAI). To do so, 30 volleyball players with FAI were selected using Cumberland ankle instability tool (CAIT) questionnaire and then divided into experimental and control groups. Pre-test was performed using drop-landing test on force plate and after six weeks of training on experimental group, the post-test was given.Participants' dynamic stability was evaluated using Time to Stabilization (TTS) index during drop-landing task, as one of the deleterious athletic movements. The participants' TTS were calculated in three directions (Vertical, Medio-lateral, and Antero-posterior) and ANCOVA was used to analyze data (α ‹ 0.05). The results showed that six weeks of hopping training had no significant effects on time to stabilization mean in the vertical (P = 0.513), the medio-lateral (P = 0.369), and the antero-posterior directions (P = 0.999) in both experiment and control groups. The results of the present study may not be compatible with those of the previous studies because of the limitations of the previous tests and methods. Also, given that the participants in our study were elite volleyball players, they may have been kept within a certain range by making compensatory changes in their joints. Therefore, it is suggested that further researches, with regard to the effect of exercises on the joints and muscles, be conducted separately and also in conjunction with each other until the possibility of observing changes in each joint separately is provided and also consideration of compensatory changes in the movements of joints involved in motion is possible