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Joint angles and leg stiffness play a role in an athlete’s Reactive Strength Index (RSI). RSI is a variable that can quantify the elasticity and stiffness capacity of muscle during rapid changes from eccentric to concentric contraction. PURPOSE: To evaluate the differences in RSI, joint absorption strategies for knee joint displacement (KD), and ankle joint displacement (AD) among soccer and volleyball female athletes during a landing task. METHODS: A total of 30 (Soccer=21, Volleyball=9) healthy, NCAA Division III female athletes (19.76 ± 1.24 years) volunteered for this study. The subjects jumped over a hurdle with subsequent maximal vertical jump measured on EZE jump mat (swift performance). The maximal vertical jump landing was video recorded and joint angle displacements (KD and AD) analyzed using Hudl technique application on iphone. Of three jump trials, highest (RSIH) and lowest RSI (RSIL) were recorded. A one-way ANOVA was used to determine differences among soccer and volleyball athletes for RSIH. Further, two-way ANOVA with replication was used to examine the differences between joint angular displacements (KD and AD) at RSIH and RSIL. RESULTS: There was no significant difference (p=0.178) between soccer (1.9±0.44) and volleyball (1.67±0.39) athletes for RSIH. There was a statistically significant interaction (p=0.043) between the effects of levels of RSI on joint angular displacements.

Differences in Lower-Extremity Kinematics Among Female Collegiate Soccer and Volleyball Players