1Musculoskeletal Health and Movement Science Laboratory, Department of Kinesiology, Judith Herb College of Education, Health Science and Human Service, University of Toledo, Toledo, OH; 2Department of Health and Human Performance, School of Education, College of Charleston, Charleston, SC; and 3Department of Exercise and Sport Science, University of North Carolina, Chapel Hill, NC.
Med Sci Sports Exerc. 2013 Nov;45(11):2120-8. doi: 10.1249/MSS.0b013e31829a3d0b.
This study aimed to investigate the influence of chronic ankle instability (CAI) on lower extremity joint energy dissipation patterns during a stop-jump task.
Nineteen participants with self-reported CAI and 19 healthy control participants volunteered. Participants performed five double-leg vertical stop-jump tasks onto a force plate. Lower extremity kinetics and kinematics were examined with an electromagnetic tracking system interfaced with a nonconductive force plate. Lower extremity joint energy dissipations were calculated for the hip, knee, and ankle in the sagittal plane during 50, 100, 150, and 200 ms after initial contact with the force plate. Energy dissipation values were normalized to the product of body mass and height [J · (N · m)(-1)]. Individual joint contribution to total lower extremity energy dissipation by the ankle, knee, and hip was reported as the percentage of energy dissipation by each joint over the total energy dissipation of all three joints. Independent t-tests and standard mean differences were conducted to assess differences in each dependent variable between the CAI and the control groups. Significance was set a priori at P < 0.05.
The CAI group demonstrated significantly less percentage of knee energy dissipation (P = 0.04) and higher percentage of ankle energy dissipation (P = 0.035) of the total energy dissipation during the 100 ms immediately after initial contact compared with the control group.
We found altered energy dissipation patterns at the knee and ankle during a stop-jump task in the CAI group. These findings may provide insight into kinetic alterations that may be associated with CAI. Future research should consider this information as it may be used to develop more effective interventions to target these potentially modifiable energy dissipation patterns in those with CAI.
本研究旨在探讨慢性踝关节不稳（CAI）对停止-跳跃任务中下肢关节能量耗散模式的影响。
19 名自报告 CAI 和 19 名健康对照组志愿者参与了本研究。参与者在力板上完成了五次双腿垂直停止跳跃任务。使用电磁跟踪系统与非导电力板接口检测下肢运动学和运动学。在与力板初始接触后的 50、100、150 和 200ms 期间，计算矢状面中髋关节、膝关节和踝关节的下肢关节能量耗散。将能量耗散值归一化为体重和身高的乘积[J·（N·m）（-1）]。踝关节、膝关节和髋关节对下肢总能量耗散的个体关节贡献以每个关节的能量耗散占所有三个关节总能量耗散的百分比报告。采用独立 t 检验和标准均值差异评估 CAI 组和对照组之间每个因变量的差异。预先设定显著性水平为 P<0.05。
CAI 组在初始接触后 100ms 内，膝关节能量耗散的百分比显著降低（P=0.04），踝关节能量耗散的百分比显著升高（P=0.035），占总能量耗散的百分比高于对照组。
我们发现 CAI 组在停止跳跃任务中膝关节和踝关节的能量耗散模式发生了改变。这些发现可能为与 CAI 相关的动力学改变提供了深入了解。未来的研究应考虑这些信息，因为它可能被用于开发更有效的干预措施，以针对 CAI 患者的这些潜在可改变的能量耗散模式。
