Han Seunguk, Oh Minsub, Lee Hyunwook, Hopkins J Ty
Exercise Sciences, Brigham Young University, Provo, United States.
Int J Sports Med. 2024 Jan;45(1):48-54. doi: 10.1055/a-2156-2644. Epub 2023 Nov 16.
Patients with chronic ankle instability (CAI) consistently display postural control alterations, which may result from sensorimotor dysfunction. This study aimed to compare muscle activity in the lower extremity and postural control among individuals with CAI, copers and uninjured controls during a static balance test. A total of 57 physically active participants were categorized into three groups (CAI, copers and controls) and performed a single-leg balance test with two visual conditions: eyes open and eyes closed. Muscle activity in six lower extremity muscles and center of pressure (CoP) variables were recorded and analyzed. Patients with CAI exhibited greater muscle activity in the medial gastrocnemius and gluteus maximus compared to controls or copers, regardless of the visual condition. Copers displayed increased gluteus medius activity compared to controls. Additionally, all groups demonstrated increased muscle activity and CoP variables when visual feedback was disrupted. These findings suggest that patients with CAI may have less effective recruitment of motor units during static balance. On the other hand, greater muscle activity in the gluteus medius in copers may represent a coping mechanism to avoid further ankle injuries. Further research on muscle activity during dynamic postural control is warranted to explore sensorimotor alterations in patients with CAI.
慢性踝关节不稳（CAI）患者始终表现出姿势控制改变，这可能是由感觉运动功能障碍引起的。本研究旨在比较CAI患者、应对者和未受伤对照组在静态平衡测试期间下肢的肌肉活动和姿势控制。共有57名身体活跃的参与者被分为三组（CAI组、应对者组和对照组），并在两种视觉条件下进行单腿平衡测试：睁眼和闭眼。记录并分析了六块下肢肌肉的肌肉活动和压力中心（CoP）变量。与对照组或应对者相比，无论视觉条件如何，CAI患者在腓肠肌内侧头和臀大肌中均表现出更大的肌肉活动。与对照组相比，应对者的臀中肌活动增加。此外，当视觉反馈中断时，所有组的肌肉活动和CoP变量均增加。这些发现表明，CAI患者在静态平衡期间可能对运动单位的募集效果较差。另一方面，应对者臀中肌更大的肌肉活动可能代表一种避免踝关节进一步受伤的应对机制。有必要对动态姿势控制期间的肌肉活动进行进一步研究，以探索CAI患者的感觉运动改变。
