(06) RELATIONSHIPS BETWEEN VERTICAL JUMP ECCENTRIC PHASE METRICS AND REACTIVE STRENGTH PERFORMANCE IN NATIONAL LEVEL FEMALE BASKETBALL PLAYERS

Background: The countermovement jump (CMJ) contains both concentric and eccentric movements, which is most commonly used in various testing settings. According to previous studies, reactive strength index-modified (RSImod) is associated with explosiveness metrics in CMJ, such as rate of force development. However, the relationships between RSImod and CMJ eccentric phase metrics, remain unclear. Purpose: This study aimed to explore the associations between RSImod, and the parameters in the eccentric phase of a CMJ. Methods:14 National-level female basketball players participated in this study. The ground reaction forces were collected through single-axis force plates, RSImod, eccentric time (ET), eccentric unweighted time (EUT), eccentric breaking Time (EBT), unweighting impulse (U-Imp), breaking impulse (B-Imp), eccentric displacement were calculated. Pearson product-moment correlation was used to analyze the associations between jumping metrics. Results: There was no significant correlation between RSImod and EBT, and EUT. However, significant relationships between RSI-mod, U-Imp, and B-Imp were revealed (r = 0.825, p < .01). Conclusions: Based on the results, athletes who had better in RSImod also demonstrated superior abilities to generate force in a short period of time, in eccentric phases. Further investigations are warranted to fully understand the underly mechanisms. Practical Application: In order to improve reactive strength performance, impulses being generated from the eccentric phase are important. Strength and conditioning professionals can choose exercises with similar force characteristics to maximize athletes’ reactive strength.


Acknowledgements: None