Department of Exercise and Sport Science, University of North Carolina at Chapel Hill.
Division of Sport Science, Pusan National University, Busan, Republic of Korea.
J Athl Train. 2024 Aug 1;59(8):822-829. doi: 10.4085/1062-6050-0379.23.
Individuals with chronic ankle instability (CAI) demonstrate altered movement patterns when their vision is disturbed during simple tasks, such as single-legged standing and walking. However, it remains unclear whether visual disruption by stroboscopic glasses alters movement patterns during landing-cutting movements, considered highly demanding sport maneuvers that mimic a typical athletic movement.
To identify altered lower extremity kinematics and muscle activation when vision is disrupted by stroboscopic glasses during landing-cutting tasks in individuals with CAI.
Case-control study.
Laboratory.
A total of 18 individuals with CAI (age = 22.3 ± 2.3 years, height = 1.75 ± 0.1 m, mass = 72.5 ± 9.8 kg) and 18 matched healthy controls (age = 21.7 ± 2.3 years, height = 1.75 ± 0.1 m, mass = 71.9 ± 10.3 kg).
INTERVENTION(S): All participants performed 5 trials of a landing-cutting task with (SV) and without (NSV) stroboscopic glasses.
MAIN OUTCOME MEASURE(S): Frontal- and sagittal-plane lower extremity kinematics and 6 lower extremity muscle activations during the stance phase of a landing-cutting task in the SV and NSV conditions.
Individuals with CAI demonstrated more ankle-inversion angle from 18% to 22% and from 60% to 100% of the stance phase and more peroneus longus activation from initial contact to 18% of the stance phase under the SV condition than under the NSV condition. We observed no differences in knee- and hip-joint angles between the visual conditions for both groups.
When wearing stroboscopic glasses, individuals with CAI showed altered movement patterns, including increased ankle-inversion angle and peroneus longus activation during the stance phase of a landing-cutting task. The results suggest that they may lack the ability to reweight sensory information to adapt their movement to visual disruption.
患有慢性踝关节不稳定（CAI）的个体在单腿站立和行走等简单任务中，当他们的视力受到干扰时，会表现出运动模式的改变。然而，当使用频闪眼镜干扰视觉时，是否会改变在着陆-切割运动中的运动模式，这仍然不清楚。着陆-切割运动被认为是高度要求的运动动作，模仿了典型的运动动作。
在患有 CAI 的个体进行着陆-切割任务时，当视觉受到频闪眼镜干扰时，确定下肢运动学和肌肉激活的变化。
病例对照研究。
实验室。
共有 18 名患有 CAI 的个体（年龄=22.3±2.3 岁，身高=1.75±0.1 m，体重=72.5±9.8 kg）和 18 名匹配的健康对照者（年龄=21.7±2.3 岁，身高=1.75±0.1 m，体重=71.9±10.3 kg）。
所有参与者进行了 5 次着陆-切割任务，分别有频闪眼镜（SV）和无频闪眼镜（NSV）。
SV 和 NSV 条件下，着陆-切割任务的站立阶段，下肢在额状面和矢状面的运动学和 6 个下肢肌肉的激活情况。
患有 CAI 的个体在 SV 条件下，与 NSV 条件相比，在站立阶段的 18%至 22%和 60%至 100%阶段，踝关节内翻角度更大，并且从初始接触到站立阶段的 18%阶段，腓骨长肌的激活更多。两组在膝关节和髋关节角度方面，在视觉条件下均无差异。
当佩戴频闪眼镜时，患有 CAI 的个体在着陆-切割任务的站立阶段表现出运动模式的改变，包括踝关节内翻角度增加和腓骨长肌的激活增加。结果表明，他们可能缺乏重新分配感觉信息的能力，无法适应视觉干扰。
