Department of Mechatronics, Optics and Mechanical Engineering Informatics, Budapest University of Technology and Economics, Budapest, Hungary.
Institute of Mathematics, Budapest University of Technology and Economics, Budapest, Hungary.
PLoS One. 2018 Apr 17;13(4):e0195995. doi: 10.1371/journal.pone.0195995. eCollection 2018.
Recent studies have suggested reduced independent and sensitive parameter sets for stabilometry measurements based on correlation and variance analyses. However, the reliability of these recommended parameter sets has not been studied in the literature or not in every stance type used in stabilometry assessments, for example, single leg stances. The goal of this study is to evaluate the test-retest reliability of different time-based and frequency-based parameters that are calculated from the center of pressure (CoP) during bipedal and single leg stance for 30- and 60-second measurement intervals. Thirty healthy subjects performed repeated standing trials in a bipedal stance with eyes open and eyes closed conditions and in a single leg stance with eyes open for 60 seconds. A force distribution measuring plate was used to record the CoP. The reliability of the CoP parameters was characterized by using the intraclass correlation coefficient (ICC), standard error of measurement (SEM), minimal detectable change (MDC), coefficient of variation (CV) and CV compliance rate (CVCR). Based on the ICC, SEM and MDC results, many parameters yielded fair to good reliability values, while the CoP path length yielded the highest reliability (smallest ICC > 0.67 (0.54-0.79), largest SEM% = 19.2%). Usually, frequency type parameters and extreme value parameters yielded poor reliability values. There were differences in the reliability of the maximum CoP velocity (better with 30 seconds) and mean power frequency (better with 60 seconds) parameters between the different sampling intervals.
最近的研究表明，基于相关和方差分析的稳定测量的独立和敏感参数集减少了。然而，这些推荐的参数集的可靠性在文献中尚未得到研究，或者在稳定测量评估中使用的每种姿势类型中都没有得到研究，例如单腿姿势。本研究的目的是评估在双足和单腿姿势下，30 秒和 60 秒测量间隔期间，基于压力中心（CoP）计算的不同基于时间和基于频率的参数的测试-重测可靠性。30 名健康受试者在双足姿势下睁眼和闭眼条件下以及单腿姿势下睁眼重复站立试验，持续 60 秒。力分布测量板用于记录 CoP。CoP 参数的可靠性通过使用组内相关系数（ICC）、测量误差（SEM）、最小可检测变化（MDC）、变异系数（CV）和 CV 符合率（CVCR）来描述。基于 ICC、SEM 和 MDC 的结果，许多参数产生了良好到中等的可靠性值，而 CoP 路径长度产生了最高的可靠性（最小 ICC>0.67（0.54-0.79），最大 SEM%=19.2%）。通常，频率类型参数和极值参数的可靠性较差。在不同的采样间隔之间，最大 CoP 速度（30 秒更好）和平均功率频率（60 秒更好）参数的可靠性存在差异。
