Neuromuscular Coordination Laboratory, University of Wisconsin, Departments of Kinesiology and Mechanical Engineering, Madison, WI, United States.
Applied Vestibular Physiology Laboratory, Emory University, School of Medicine, Department of Rehabilitation Medicine, Division of Physical Therapy, Atlanta, GA, United States.
Hum Mov Sci. 2024 Aug;96:103239. doi: 10.1016/j.humov.2024.103239. Epub 2024 May 28.
This study evaluated psychometric properties of the Intersection Point Height, derived from ground-on-feet force characteristics, as a tool for assessing balance control. We compare this metric with traditional center of pressure (CP) measurements.
Data from a public dataset of 146 participants, divided into younger (<60 years old) and older (≥60 years old) adults, were analyzed. Clinical tests included the Short Falls Efficacy Scale-International, International Physical Activity Questionnaire-Short Form, Trail Making Tests A and B, and the Mini-Balance Evaluation Systems Test. Reliability and validity were assessed through the intra-class correlation coefficient (ICC[3,1]) for mean Intersection Point Height in each test condition and Spearman's rho between summative Intersection Point Height (the sum of intra-condition mean values across all test conditions within one subject) and other variables of interest, respectively.
Mean Intersection Point Height showed good to excellent reliability (ICC = 0.712-0.901), similar to that of CP velocity (ICC = 0.733-0.922) and greater than that of variance CPx (0.475-0.768). Summative Intersection Point Height exhibited strong convergent validity with Trail Making Tests A and B (rho = 0.49, p < 0.001) and the Mini-Balance Evaluation Systems Test (rho = -0.47, p < 0.001). At most, a weak to moderate association (rho = 0.39-0.49, p < 0.001) was found between intra-condition mean Intersection Point Height with CP metrics. Intra-condition mean Intersection Point Height demonstrated weak to moderate convergent validity with several clinical measures (rho = 0.32-0.52, p < 0.001). In contrast, at most, a weak to moderate association (rho = 0.39-0.49, p < 0.001) was found between intra-condition mean Intersection Point Height with CP metrics.
The Intersection Point Height is a reliable and valid balance measure. Further, we believe that it is a more comprehensive evaluation than CP metrics.
本研究评估了源自地面足力特征的交点高度（Intersection Point Height）作为评估平衡控制工具的心理测量学特性。我们将该指标与传统的压力中心（Center of Pressure，CP）测量进行了比较。
分析了来自公共数据集的 146 名参与者的数据，这些参与者分为年轻（<60 岁）和年长（≥60 岁）成年人。临床测试包括简短跌倒效能量表-国际版、国际体力活动问卷-短表、连线测试 A 和 B 以及简易平衡评估系统测试。通过在每个测试条件下交点高度均值的组内相关系数（ICC[3,1]）以及交点高度总和（每个受试者所有测试条件下的均值之和）与其他感兴趣变量之间的 Spearman 秩相关系数，分别评估了可靠性和有效性。
交点高度均值的可靠性较好（ICC=0.712-0.901），与 CP 速度（ICC=0.733-0.922）相似，优于 CPx 方差（0.475-0.768）。交点高度总和与连线测试 A 和 B（rho=0.49，p<0.001）和简易平衡评估系统测试（rho=-0.47，p<0.001）表现出较强的收敛效度。在大多数情况下，交点高度均值与 CP 指标之间的相关性较弱到中等（rho=0.39-0.49，p<0.001）。交点高度均值与多个临床测量值之间表现出较弱到中等的收敛效度（rho=0.32-0.52，p<0.001）。相比之下，在大多数情况下，交点高度均值与 CP 指标之间的相关性较弱到中等（rho=0.39-0.49，p<0.001）。
交点高度是一种可靠且有效的平衡测量方法。此外，我们认为它比 CP 指标更全面。
