Department of Physical Therapy, Program in Exercise Science, Strength and Conditioning Research Laboratory, Marquette University, Milwaukee, Wisconsin, USA.
J Strength Cond Res. 2010 Aug;24(8):1983-7. doi: 10.1519/JSC.0b013e3181e72466.
The ability to develop force quickly is a requisite ability in most sports. The reactive strength index (RSI) has been developed as a measure of explosive strength and is derived by evaluating jump height divided by ground contact time during the depth jump (DJ). At present, the RSI is typically used to evaluate DJ performance, because it is the only plyometric exercise with an identifiable ground contact time. The purpose of this study was to introduce a modification of the RSI (RSImod) that can be used to evaluate the explosive power of any vertical plyometric exercise. This study will also assess the reliability of the RSImod, evaluate the RSImod of a variety of plyometric exercises, and examine gender differences. Twenty-six men and 23 women served as subjects. Subjects performed 3 repetitions for each of 5 plyometric exercises including the countermovement jump (CMJ), tuck jump, single-leg jump, squat jump, and dumbbell CMJ. Data were analyzed using a 2-way analysis of variance to evaluate differences in RSImod between the plyometric exercise and the interaction between plyometric exercise RSImod and gender. The analysis of RSImod revealed significant main effects for plyometric exercise type (p <or= 0.001) but not for the interaction between plyometric exercise type and gender (p > 0.05). Results of pairwise comparisons indicate that the RSImod is statistically different between all plyometric exercises studied. Intraclass correlation coefficients indicate that RSImod is highly reliable for all of the exercises studied. The RSImod offers a highly reliable method of assessing the explosiveness developed during a variety of plyometric exercises.
快速发力能力是大多数运动的必备能力。反应强度指数（RSI）已被开发为衡量爆发力的指标，通过评估深蹲跳（DJ）中的跳跃高度除以地面接触时间来得出。目前，RSI 通常用于评估 DJ 表现，因为它是唯一具有可识别地面接触时间的增强式训练。本研究旨在介绍一种可用于评估任何垂直增强式训练爆发力的 RSI 修正版（RSImod）。本研究还将评估 RSImod 的可靠性，评估各种增强式训练的 RSImod，并研究性别差异。26 名男性和 23 名女性作为研究对象。研究对象进行了 5 种增强式训练的 3 次重复，包括深蹲跳（CMJ）、屈体跳、单腿跳、深蹲跳和哑铃 CMJ。使用 2 因素方差分析对数据进行分析，以评估增强式训练之间和增强式训练 RSImod 与性别之间的交互作用的 RSImod 差异。RSImod 的分析显示出增强式训练类型的显著主要影响（p≤0.001），但增强式训练类型和性别之间的交互作用没有影响（p＞0.05）。成对比较的结果表明，研究中所有的增强式训练的 RSImod 都存在统计学差异。组内相关系数表明，所有研究的练习的 RSImod 都具有高度可靠性。RSImod 提供了一种高度可靠的方法，可用于评估各种增强式训练中产生的爆发力。
