| Abstrakt: |
The purpose of this study was to clarify the performance and kinetic characteristics of the rebound jump (RJ) in high jumpers and the characteristics of changes in RJ performance and kinetics in top level high jumpers. An evaluation perspective for effectively improving stretch-shortening cycle (SSC) performance of the lower limb, which is important for improving high jump competition records, was also formulated using the RJ test. Fourteen male high jumpers performed the RJ test and were categorized into upper and lower groups based on their median competition performance. RJ performance (RJ-index, contact time, and jump height) and kinetics (torque, power, work, and relative work) were calculated and evaluated statistically through Pearson correlations and independent t tests (p < 0.05). Significant correlations were found between high jump competition records and the RJ-index and jump height, which were significantly higher in the upper group than in the lower group. The RJ-index, jumping height, negative ankle joint power, knee concentric torque and positive knee joint power were significantly higher in the upper group than in the lower group. However, there was no significant difference in contact time between the groups. Additionally, the RJ test and competition records of high jumper A over a 7-year period showed that this individual’s contact time during takeoff in the RJ was comparable to the overall average, whereas the RJ-index and jump height were above average. In addition, high jumper A’s ankle negative and positive power values during takeoff in the RJ were higher than the upper group average. Furthermore, there was a strong correlation between the knee eccentric torque and the RJ-index. Therefore, evaluation of not only the performance variables of the RJ test, but also the characteristics of force exertion in the takeoff of the high jump can be taken into account to obtain a perspective for assessing the lower limb SSC performance of high jumpers. [ABSTRACT FROM AUTHOR] |
