Purpose: To assess the short-term reliability of measurement instruments to quantify the acute psychophysiological response to load in adolescent soccer players in relation to biological maturity. Methods: Data were collected from 108 U12 to U17 soccer players on 2 consecutive weeks (pre, n = 32; at, n = 34; and post, n = 42 estimated peak height velocity). Measurements consisted of the Short Recovery and Stress Scale, a countermovement jump, assessment of leg stiffness, and a submaximal run to assess exercise heart rate and heart rate recovery. Test–retest reliability was assessed with the coefficient of variation (CV) and intraclass correlation coefficient (ICC). Results: Items of the Short Recovery and Stress Scale showed poor reliability across maturity groups (CV = 7.0%–53.5%; ICC = .28 to .79). Only few countermovement jump variables (jump height, concentric impulse, and concentric velocity) possessed good reliability. For most variables of the countermovement jump, reliability was better for the post peak height velocity group followed by at-peak height velocity and prepeak height velocity. Very high levels of reliability across maturity groups were observed for exercise heart rate (CV < 1.8%; ICC > .94), while heart rate recovery was more variable (CV < 16.5%; ICC > .48). Conclusion: Results suggest that the majority of investigated variables have poor reliability, questioning their ability to detect small, yet meaningful changes in acute responses to load in adolescent soccer players.

目的：评估测量仪器的短期可靠性，以量化与生物成熟度相关的青少年足球运动员对负荷的急性心理生理反应。方法：连续 2 周从 108 名 U12 到 U17 足球运动员收集数据（前，n = 32；在，n = 34；和后，n = 42 估计的峰值身高速度）。测量包括短期恢复和压力量表、反向运动跳跃、腿部僵硬评估以及评估运动心率和心率恢复的次最大跑步。用变异系数（CV）和组内相关系数（ICC）评估重测信度。结果：短期恢复和压力量表的项目在成熟度组中显示出较差的可靠性（CV = 7.0%–53.5%；ICC = .28 到 .79）。只有少数反向运动跳跃变量（跳跃高度、同心冲量和同心速度）具有良好的可靠性。对于反向运动跳跃的大多数变量，峰后高度速度组的可靠性更好，其次是峰高度速度和峰前高度速度。在运动心率（CV < 1.8%；ICC > .94）方面观察到成熟组的可靠性水平非常高，而心率恢复变化更大（CV < 16.5%；ICC > .48）。结论：结果表明，大多数调查变量的可靠性较差，质疑他们检测青少年足球运动员对负荷的急性反应的微小但有意义的变化的能力。