Franceschi Alberto, Robinson Mark A, Owens Daniel, Brownlee Thomas, Ferrari Bravo Duccio, Enright Kevin
Sport Science and R&D Department, Juventus Football Club, Torino, Italy.
School of Sport and Exercise Sciences, Liverpool John Moores University, Liverpool, United Kingdom.
Front Sports Act Living. 2023 Jul 13;5:1173621. doi: 10.3389/fspor.2023.1173621. eCollection 2023.
To effectively monitor post-match changes in physical performance, valid, reliable and practical measures which are sensitive to change are required. This study aimed to quantify test-retest reliability and sensitivity to change of a range of physical performance measures recorded during an isometric posterior chain (IPC) lower-limb muscle test and a countermovement jump (CMJ) test.
Eighteen Italian Serie A academy soccer players performed three IPC repetitions per limb and five CMJ trials in 4 testing sessions. Test-retest reliability was evaluated between two testing sessions seven days apart using typical error of measurement, coefficient of variation and intraclass correlation coefficient. Sensitivity to change was assessed on two additional testing sessions performed before and immediately after a soccer match through Hedges' g effect size (g) and comparisons to typical error.
Absolute reliability (coefficient of variations) ranged from 1.5 to 8.8%. IPC and CMJ measures demonstrated to relative reliability (intraclass correlation coefficients ranged from 0.70 to 0.98). A wide range of physical performance measures showed significant alterations post-match ( < 0.05; : to ). IPC peak force and torque, CMJ reactive strength index modified, CMJ eccentric forces (mean breaking force, mean deceleration force, peak force, force at zero velocity) and CMJ mean power measures had post-match changes greater than their typical variation, demonstrating acceptable sensitivity in detecting performance changes at post-match.
IPC peak force and torque, CMJ reactive strength index modified, CMJ eccentric phase forces and CMJ mean power were found to be both reliable and sensitive to change, and thus may be appropriate for monitoring post-match neuromuscular performance in youth soccer population.
为有效监测比赛后身体机能的变化，需要采用对变化敏感、有效、可靠且实用的测量方法。本研究旨在量化等长后链（IPC）下肢肌肉测试和反向纵跳（CMJ）测试中记录的一系列身体机能指标的重测信度及对变化的敏感性。
18名意大利甲级联赛青年足球运动员在4次测试中，每条腿进行3次IPC重复测试，以及5次CMJ测试。使用测量标准误、变异系数和组内相关系数，在相隔7天的两次测试之间评估重测信度。通过Hedges' g效应量（g）以及与标准误的比较，在足球比赛前和比赛后立即进行的另外两次测试中评估对变化的敏感性。
绝对信度（变异系数）范围为1.5%至8.8%。IPC和CMJ指标显示出相对信度（组内相关系数范围为0.70至0.98）。一系列身体机能指标在比赛后显示出显著变化（<0.05；：至）。IPC峰值力和扭矩、改良的CMJ反应力量指数、CMJ离心力（平均断裂力、平均减速力、峰值力、零速度时的力）和CMJ平均功率指标在比赛后的变化大于其典型变异，表明在检测比赛后机能变化方面具有可接受的敏感性。
发现IPC峰值力和扭矩、改良的CMJ反应力量指数、CMJ离心相力和CMJ平均功率对变化既可靠又敏感，因此可能适用于监测青少年足球运动员比赛后的神经肌肉机能。
