Purpose: To examine the reliability, validity, and performance characteristics of the 10 to 5 repeated jump test (10–5 RJT) in adolescent male athletes. The 10–5 RJT has been shown to be a valid and reliable test of reactive strength index (RSI) in older adolescents (age 17–19 y), but less is known in younger adolescent athletes at different stages of maturity. Methods: Athletes (age 11–17 y) completed the 10–5 RJT on 2 days, 1 week apart, to examine the reliability (n = 41), validity (n = 18) of the test. Athletes were classified as pre, circa, or post peak height velocity (PHV) height velocity using maturity offset to examine the effect of maturation status on RSI, flight time (FT), ground contact time (GCT), and jump height (JH) (n = 68) using a cross-sectional design. Results: Paired samples t tests showed no significant differences (P ≥ .05), and Bland–Altman analysis showed no bias and close limits of agreement for RSI, JH, FT, and GCT between the contact mat and force plate. Interday reliability was rated excellent for RSI (intraclass correlation coefficient = .91) and good for GCT, FT, and JH (intraclass correlation coefficient = .81–.85). All variables had a coefficient of variation ≤ 10%. RSI increased across maturation groups, with significant differences between pre-PHV and post-PHV groups (P = .014, d = 1.00). Conclusion: The 10–5 RJT is a valid and reliable test for adolescent male athletes. Greater RSI with advancing maturity was primarily due to increased FT and JH, with GCT remaining similar.

目的：检查青少年男性运动员 10 到 5 次重复跳跃测试 (10-5 RJT) 的信度、效度和表现特征。10-5 RJT 已被证明是对年龄较大的青少年（17-19 岁）的反应力量指数 (RSI) 进行有效且可靠的测试，但对于处于不同成熟阶段的年轻青少年运动员知之甚少。方法：运动员（11-17 岁）在 2 天、1 周内完成 10-5 次 RJT，以检查测试的可靠性（n = 41）和有效性（n = 18）。运动员被分类为峰值前、大约或峰值后高度速度 (PHV) 使用成熟度偏移来检查成熟状态对 RSI、飞行时间 (FT)、地面接触时间 (GCT) 和跳跃高度 (JH) 的影响(n = 68) 使用横截面设计。结果：配对样本t检验显示差异不显着（P ≥ .05)，Bland-Altman 分析显示接触垫和测力台之间的 RSI、JH、FT 和 GCT 没有偏差和接近的一致性限制。RSI 的日间信度被评为优秀（组内相关系数 = .91），GCT、FT 和 JH 的日间信度良好（组内相关系数 = .81–.85）。所有变量的变异系数≤10%。成熟组的 RSI 增加，PHV 前组和 PHV 后组之间存在显着差异（P  = .014，d  = 1.00）。结论: 10-5 RJT 是对青少年男性运动员有效且可靠的测试。随着成熟度的提高，RSI 更大，主要是由于 FT 和 JH 增加，而 GCT 保持相似。