Kim Kyung-Min, Kim Joo-Sung, Grooms Dustin R
1 Department of Kinesiology and Sport Sciences, University of Miami, Miami, FL.
2 Division of Athletic Training, School of Applied Health Sciences and Wellness, College of Health Sciences and Professions, Ohio University, Athens, OH.
J Sport Rehabil. 2017 Sep 1;26(5). doi: 10.1123/jsr.2017-0035. Epub 2017 Jun 12.
Patients with somatosensory deficits have been found to rely more on visual feedback for postural control. However, current balance tests may be limited in identifying increased visual dependence (sensory reweighting to the visual system), as options are typically limited to eyes open or closed conditions with no progressions between.
To assess the capability of stroboscopic glasses to induce sensory reweighting of visual input during single-leg balance.
Descriptive
Laboratory
18 healthy subjects without vision or balance disorders or lower extremity injury history (9 females; age = 22.1 ± 2.1 y; height = 169.8 ± 8.5 cm; mass = 66.5 ± 10.6 kg) participated.
Subjects performed 3 trials of unipedal stance for 10 s with eyes open (EO) and closed (EC), and with stroboscopic vision (SV) that was completed with specialized eyewear that intermittently cycled between opaque and transparent for 100 ms at a time. Balance tasks were performed on firm and foam surfaces, with the order randomized.
Ten center-of-pressure parameters were computed.
Separate ANOVAs with repeated measures found significant differences between the 3 visual conditions on both firm (Ps=<.001) and foam (Ps=<.001 to .005) surfaces for all measures. For trials on firm surface, almost all measures showed that balance with SV was significantly impaired relative to EO, but less impaired than EC. On the foam surface, almost all postural stability measures demonstrated significant impairments with SV compared with EO, but the impairment with SV was similar to EC.
SV impairment of single-leg balance was large on the firm surface, but not to the same degree as EC. However, the foam surface disruption to somatosensory processing and sensory reweighting to vision lead to greater disruptive effects of SV to the same level as EC. This indicates that when the somatosensory system is perturbed even a moderate decrease in visual feedback (SV) may induce an EC level impairment to postural control during single-leg stance.
已发现患有躯体感觉缺陷的患者在姿势控制方面更多地依赖视觉反馈。然而，当前的平衡测试在识别增加的视觉依赖性（感觉重新加权至视觉系统）方面可能存在局限性，因为测试选项通常仅限于睁眼或闭眼条件，且两者之间没有过渡。
评估频闪眼镜在单腿平衡期间诱导视觉输入感觉重新加权的能力。
描述性研究
实验室
18名无视力或平衡障碍且无下肢损伤史的健康受试者（9名女性；年龄=22.1±2.1岁；身高=169.8±8.5厘米；体重=66.5±10.6千克）参与研究。
受试者进行3次单腿站立试验，每次持续10秒，分别为睁眼（EO）、闭眼（EC）以及使用频闪视觉（SV），频闪视觉通过专门的眼镜实现，眼镜会以每次100毫秒的间隔在不透明和透明之间间歇性循环切换。平衡任务在坚实表面和泡沫表面上进行，顺序随机。
计算10个压力中心参数。
采用重复测量的单独方差分析发现，在坚实表面（P值均＜.001）和泡沫表面（P值在＜.001至.005之间），所有测量指标在3种视觉条件下均存在显著差异。在坚实表面的试验中，几乎所有测量指标都显示，与睁眼相比，频闪视觉条件下的平衡显著受损，但比闭眼时受损程度轻。在泡沫表面，与睁眼相比，几乎所有姿势稳定性测量指标在频闪视觉条件下均显示出显著受损，但频闪视觉条件下的受损程度与闭眼时相似。
在坚实表面上，频闪视觉对单腿平衡的损害较大，但程度不如闭眼。然而，泡沫表面对躯体感觉处理和视觉感觉重新加权的干扰导致频闪视觉产生与闭眼相同程度的更大干扰效应。这表明，当躯体感觉系统受到干扰时，即使视觉反馈（频闪视觉）有适度降低，也可能在单腿站立期间对姿势控制造成与闭眼时同等程度的损害。
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