Sugimoto Yuki A, McKeon Patrick O, Rhea Christopher K, Mattacola Carl G, Ross Scott E
Department of Physical Therapy & Human Movement Science, Feinberg School of Medicine, Northwestern University, Chicago, IL 60611, USA.
Department of Exercise Science & Athletic Training, Ithaca College, Ithaca, NY 14850, USA.
Bioengineering (Basel). 2024 Sep 25;11(10):956. doi: 10.3390/bioengineering11100956.
The purpose of this study is to investigate the effect of task constraints on the neurobiological systems while maintaining postural control under various sensory feedback manipulations in individuals with and without Chronic Ankle Instability (CAI). Forty-two physically active individuals, with and without CAI, were enrolled in a case-control study conducted at a biomechanics research laboratory. All participants underwent the Sensory Organization Test (SOT), which assesses individuals' ability to integrate somatosensory, visual, and vestibular feedback to maintain postural control in double-, uninjured-, and injured-limb stances under six different conditions in which variations in the sway-referenced support surface (platform) and visual surroundings, with and without vision, are manipulated to affect somatosensory and visual feedback. Center-of-Pressure (COP) path length was computed from raw data collected during trials of each SOT condition. Sample Entropy (SampEN) values were extracted from the COP path length time series to examine neurobiological systems complexity, with lower SampEN values indicating more predictable and periodic (rigid) neurobiological systems, while higher SampEN values indicate more unpredictable and random systems. The results show that specific task constraints affect the neurobiological systems. Specifically, individuals with CAI demonstrated reduced complexity (decreased SampEN values) in the neurobiological systems during the uninjured-limb stance when all sensory feedback was intact and during both uninjured- and injured-limb stances when they were forced to rely on vestibular feedback. These results highlight the interplay between sensory feedback and task constraints in individuals with CAI and suggest potential adaptations in the neurobiological systems involved in postural control.
本研究的目的是调查任务限制对神经生物学系统的影响，同时在有无慢性踝关节不稳（CAI）的个体中，于各种感觉反馈操作下维持姿势控制。42名有或无CAI的身体活跃个体参与了在生物力学研究实验室进行的病例对照研究。所有参与者都接受了感觉组织测试（SOT），该测试评估个体整合体感、视觉和前庭反馈的能力，以在六种不同条件下的双下肢、未受伤肢体和受伤肢体站立姿势中维持姿势控制，其中摇摆参考支撑面（平台）和视觉环境在有视觉和无视觉的情况下有所变化，以影响体感和视觉反馈。从每个SOT条件试验期间收集的原始数据中计算压力中心（COP）路径长度。从COP路径长度时间序列中提取样本熵（SampEN）值，以检查神经生物学系统的复杂性，较低的SampEN值表明神经生物学系统更具可预测性和周期性（刚性），而较高的SampEN值表明系统更不可预测且随机。结果表明，特定的任务限制会影响神经生物学系统。具体而言，有CAI的个体在所有感觉反馈完整时的未受伤肢体站立姿势期间，以及在被迫依赖前庭反馈时的未受伤和受伤肢体站立姿势期间，神经生物学系统的复杂性降低（SampEN值降低）。这些结果突出了有CAI个体中感觉反馈与任务限制之间的相互作用，并暗示了姿势控制所涉及的神经生物学系统的潜在适应性变化。
