Hu M H, Hung Y C, Huang Y L, Peng C D, Shen S S
School of Physical Therapy, College of Medicine, National Taiwan University, Taipei, Republic of China.
Proc Natl Sci Counc Repub China B. 1996 Jul;20(3):78-86.
Maintaining stance stability under varying sensory environment is an essential function in the elderly and among patients. Testing sensory organization ability of standing balance, the Sensory Organization Test (SOT), has become a standard procedure in many clinical and laboratory settings. The stance stability can be quantified by two forceplate measures in the SOT: the equilibrium score (ES) and the sway area (SA). This study compares the validity of the ES and the SA in detecting gender, trial, and sensory effects on stability in twenty (ten male, ten female) healthy young adults. Subjects were tested under six sensory conditions: eyes open (EO), eyes closed (EC), sway-referenced vision (Vs), sway-referenced support surface (Ss), eyes closed sway-referenced support surface (ECSs), and sway-referenced visual surround and support surface (VsSs). A visual surround and/or the support surface were tilted proportionately to the subject's spontaneous sway in the sway-referenced conditions. Three trials, 20-second for each trial, were repeated for each sensory condition. Above results demonstrated that the Pearson correlation coefficients between the ES and the SA were all highly significant (p < .0001) except for the first trial of the EO condition. The consistencies in which the two measures discriminated among sensory conditions were tested by the Kendall's coefficient of concordance. The Kendall's coefficient for the ES (W = .843) and the SA (W = .866) were high and similar. Separate ANOVA procedure for the ES and SA revealed that both measures satisfactorily detected a significant sensory condition and trial effects and insignificant gender effect. We can conclude that ES and SA are valid measures of stance stability during the SOT. Our results confirm that healthy young adults have a poorer postural stability when the visual and somatosensory inputs are simultaneously altered. Moreover, the learning effect is observed during repeated trials within test conditions.
在不同的感觉环境下维持姿势稳定性是老年人和患者的一项基本功能。测试站立平衡的感觉组织能力的感觉组织测试（SOT）已成为许多临床和实验室环境中的标准程序。姿势稳定性可以通过SOT中的两种测力台测量来量化：平衡分数（ES）和摆动面积（SA）。本研究比较了ES和SA在检测20名（10名男性，10名女性）健康年轻成年人中性别、试验和感觉对稳定性影响方面的有效性。受试者在六种感觉条件下进行测试：睁眼（EO）、闭眼（EC）、摆动参考视觉（Vs）、摆动参考支撑面（Ss）、闭眼摆动参考支撑面（ECSs）以及摆动参考视觉环境和支撑面（VsSs）。在摆动参考条件下，视觉环境和/或支撑面会与受试者的自发摆动成比例倾斜。每种感觉条件重复进行三次试验，每次试验20秒。上述结果表明，除了EO条件下的第一次试验外，ES和SA之间的皮尔逊相关系数均高度显著（p < .0001）。通过肯德尔和谐系数检验了两种测量在区分感觉条件方面的一致性。ES的肯德尔系数（W = .843）和SA的肯德尔系数（W = .866）都很高且相似。对ES和SA分别进行方差分析程序表明，两种测量都能令人满意地检测到显著的感觉条件和试验效应以及不显著的性别效应。我们可以得出结论，ES和SA是SOT期间姿势稳定性的有效测量指标。我们的结果证实，当视觉和躯体感觉输入同时改变时，健康年轻成年人的姿势稳定性较差。此外，在测试条件下的重复试验中观察到了学习效应。
