Strength and Conditioning Department, Irish Rugby Football Union, Dublin, Ireland.
J Strength Cond Res. 2011 Aug;25(8):2177-84. doi: 10.1519/JSC.0b013e3181e85b6a.
The aim of this study was to investigate the recovery process of a maximal stretch-shortening cycle (SSC) fatigue workout on the biomechanical performance of drop jump (DJ) and rebound jump (RBJ) on a force sledge apparatus. Thirteen elite level rugby players performed sledge DJs and RBJs before and 15, 45, 120, and 300 seconds after a maximum SSC fatigue workout. Flight time, ground contact time (CT), peak force, reactive strength index (RSI), and leg-spring stiffness were the dependent variables. The DJ results showed that after 15 seconds recovery, there was a significant reduction in flight time (FT) (p < 0.01), RSI (p < 0.001), peak force (p < 0.01), and leg stiffness (p < 0.001). Similarly, the results for the RBJ indicated that the fatigue workout significantly reduced FT (p < 0.001), peak force (p < 0.01), RSI (p < 0.01), and significantly increased CT (p < 0.05) at the 15-second interval. The results also indicated a potentiation effect at the 300-second interval because of significant increases in RSI, peak force, and leg stiffness (p < 0.05) for the RBJ and significant increases in RSI (p < 0.05), peak force, and leg stiffness (p < 0.01) and a significant decrease in ground CT (p < 0.05) for the DJ. A maximal SSC fatigue workout had both an inhibiting and potentiating effect on DJ and RBJ performance depending on the recovery interval. The efficiency of the SSC function was reduced immediately after the cessation of the fatigue workout. A potentiation effect was evident for both jumps 300 seconds postfatigue.
本研究旨在探讨最大强度的弹震式收缩-伸展循环（SSC）疲劳训练对力量雪橇上的纵跳（DJ）和反弹跳（RBJ）生物力学性能恢复的影响。13 名高水平橄榄球运动员在完成最大 SSC 疲劳训练前后以及 15、45、120 和 300 秒后，在力量雪橇上进行了 DJ 和 RBJ。飞行时间、触地时间（CT）、峰值力、反应强度指数（RSI）和腿部弹簧刚度是依赖变量。DJ 的结果表明，恢复 15 秒后，飞行时间（FT）（p < 0.01）、RSI（p < 0.001）、峰值力（p < 0.01）和腿部刚度（p < 0.001）显著降低。同样，RBJ 的结果表明，疲劳训练显著降低了 FT（p < 0.001）、峰值力（p < 0.01）、RSI（p < 0.01），并在 15 秒间隔时显著增加了 CT（p < 0.05）。结果还表明，在 300 秒间隔时存在增强效应，因为 RBJ 的 RSI、峰值力和腿部刚度显著增加（p < 0.05），而 DJ 的 RSI（p < 0.05）、峰值力和腿部刚度显著增加（p < 0.01），地面 CT 显著减少（p < 0.05）。最大强度的 SSC 疲劳训练对 DJ 和 RBJ 的性能既有抑制作用又有增强作用，这取决于恢复间隔。SSC 功能的效率在疲劳训练停止后立即降低。在疲劳后 300 秒，两种跳跃都出现了增强效应。
