Imai Satoshi, Harato Kengo, Morishige Yutaro, Nagura Takeo, Matsumoto Hideo, Hase Kimitaka
Department of Rehabilitation, Keio University Hospital, Tokyo, Japan.
Department of Physical Medicine and Rehabilitation, Kansai Medical University, Osaka, Japan.
J Hum Kinet. 2024 Dec 19;97:51-63. doi: 10.5114/jhk/190681. eCollection 2025 Apr.
Visual information is crucial for motor control during a jump-landing, allowing for anticipation of landing timing and prediction of the impact. However, the effects of visual occlusion on lower extremity biomechanics are not well understood. To investigate this, we studied the impact of visual occlusion on motor control during a low-intensity single-leg landing. Seventeen female college students participated in the controlled laboratory investigation. They performed low-intensity repetitive vertical hopping on a single leg under eyes-open (EO) and eyes-closed (EC) conditions. Main outcome measurements were taken, including jump height, ground reaction forces, joint angles, and joint moments, using a motion capture system. The significant effects of visual occlusion were as follows: 1) a decrease in the hip flexion angle at ground contact (p = 0.02), 2) an increase in Fx (medio-lateral ground reaction force), knee valgus, and internal rotation angles in the early phase within 80 ms after ground contact (p < 0.05), and 3) an increase in Fz (vertical ground reaction force) and a reduction in hip and knee flexion angles at peak Fz (p < 0.05). The amount of angular change at the ankle joint correlated with the hip and knee joints only under the EC condition (p < 0.05). These changes indicate modifications in landing strategy for safety and/or deficiencies in control for an efficient and accurate landing. In conclusion, visual information contributes to safe and accurate motor control during low-intensity landing movements.
视觉信息对于跳跃着陆过程中的运动控制至关重要，它能够让人预判着陆时机并预测冲击力。然而，视觉遮挡对下肢生物力学的影响尚未得到充分了解。为了探究这一点，我们研究了视觉遮挡对低强度单腿着陆时运动控制的影响。17名女大学生参与了这项对照实验室研究。她们在睁眼（EO）和闭眼（EC）条件下进行单腿低强度重复垂直跳跃。使用运动捕捉系统进行主要结果测量，包括跳跃高度、地面反作用力、关节角度和关节力矩。视觉遮挡的显著影响如下：1）着地时髋关节屈曲角度减小（p = 0.02），2）着地后80毫秒内早期阶段Fx（内外侧地面反作用力）、膝外翻和内旋角度增加（p < 0.05），3）Fz（垂直地面反作用力）增加，且在Fz峰值时髋关节和膝关节屈曲角度减小（p < 0.05）。仅在EC条件下，踝关节的角度变化量与髋关节和膝关节相关（p < 0.05）。这些变化表明着陆策略为了安全而进行了调整，和/或在有效且准确着陆的控制方面存在不足。总之，视觉信息有助于在低强度着陆动作中实现安全且准确的运动控制。
