Ford Kevin R, Myer Gregory D, Hewett Timothy E
Cincinnati Children's Hospital Medical Center, Sports Medicine Biodynamics Center and Human Performance Laboratory, Cincinnati, OH 45229, USA.
Med Sci Sports Exerc. 2007 Nov;39(11):2021-8. doi: 10.1249/mss.0b013e318149332d.
Biomechanical measures quantified during dynamic tasks with coupled epidemiological data in longitudinal experimental designs may be useful to determine which mechanisms underlie injury risk in young athletes. A key component is the ability to reliably measure biomechanical variables between testing sessions. The purpose was to determine the reliability of three-dimensional (3D) lower-extremity kinematic and kinetic variables during landing in young athletes measured within a session and between two sessions 7 wk apart.
Lower-extremity kinetics and kinematics were quantified during a drop vertical jump. Coefficient of multiple correlations (CMC), intraclass correlation coefficients (ICC (3, k), ICC (3, 1)), and typical error (TE) analyses were used to examine within- and between-session reliability.
There were no differences in within-session reliability for peak angular rotations between planes with all discrete variables combined (sagittal ICC > or = 0.933, frontal ICC > or = 0.955, transverse ICC > or = 0.934). Similarly, the between-session reliability of kinematic measures were not different between the three planes of motion but were lower than the within-session ICC. The within- and between-session reliability of discrete joint moment variables were excellent for all sagittal (within ICC > or = 0.925, between ICC > or = 0.800) and frontal plane moment measures (within ICC > or = 0.778, between ICC > or = 0.748). CMC analysis revealed similar averaged within-session (CMC = 0.830 +/- 0.119) and between-session (CMC = 0.823 +/- 0.124) waveform comparisons.
The majority of the kinematic and kinetic variables in young athletes during landing have excellent to good reliability. The ability to reliably quantify lower-extremity biomechanical variables of young athletes during dynamic tasks over extended intervals may aid in identifying potential mechanisms related to injury risk factors.
在纵向实验设计中，结合流行病学数据对动态任务期间的生物力学指标进行量化，可能有助于确定年轻运动员受伤风险背后的机制。一个关键因素是在测试阶段之间可靠测量生物力学变量的能力。本研究旨在确定年轻运动员在一次测试中以及间隔7周的两次测试中进行着陆动作时，三维（3D）下肢运动学和动力学变量的可靠性。
在垂直纵跳过程中对下肢动力学和运动学进行量化。采用多重相关系数（CMC）、组内相关系数（ICC(3,k)，ICC(3,1)）和典型误差（TE）分析来检验测试阶段内和阶段间的可靠性。
所有离散变量合并后，各平面之间峰值角旋转的测试阶段内可靠性无差异（矢状面ICC≥0.933，额状面ICC≥0.955，横断面ICC≥0.934）。同样，运动学测量的测试阶段间可靠性在三个运动平面之间没有差异，但低于测试阶段内的ICC。离散关节力矩变量在矢状面（测试阶段内ICC≥0.925，测试阶段间ICC≥0.800）和额状面力矩测量（测试阶段内ICC≥0.778，测试阶段间ICC≥0.748）的测试阶段内和阶段间可靠性均极佳。CMC分析显示，测试阶段内（CMC = 0.830±0.119）和阶段间（CMC = 0.823±0.124）的波形比较结果相似。
年轻运动员着陆时的大多数运动学和动力学变量具有极佳至良好的可靠性。在较长时间内对年轻运动员动态任务期间的下肢生物力学变量进行可靠量化的能力，可能有助于识别与受伤风险因素相关的潜在机制。
