Assessment of takeoff execution ability in high jumpers by rebound jump

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The purpose of this study was to present the characteristics of performance and kinetics of the rebound jump (RJ) in high jumpers and the characteristics of changes in performance and kinetics of the RJ in the top level high jumpers, and to present an evaluation perspective to effectively improve SSC performance of the lower limb, which is important for improving high jump competition records, using the RJ test.Fourteen male high jumpers performed the RJ test and were categorized into upper and lower groups based on the median performance.RJ performance (RJ-index, contact time, and jumping height) and kinetics (torque, power, work, and relative work) were calculated and statistically evaluated through Pearson correlations and independent t-tests (p<0.05).The results showed that significant correlations were found between high jump competition records and RJ-index and jump height.The RJ-index and jump height were significantly higher in the upper group of competition records than in the lower group.The RJ-index, jumping height, negative ankle joint power, knee concentric torque and positive knee joint power was 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, but 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 RJ-index.Therefore, evaluating RJ test of high jumpers, not only the performance variables of the RJ test, but also the characteristics of force exertion in the crossing of the high jump can be taken into account to obtain a perspective for assessing the lower limb SSC performance of high jumpers.早期公開

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