Reliability of traditional and fractal dimension measures of quiet stance center of pressure in young, healthy people
Reliability of traditional and fractal dimension measures of quiet stance center of pressure in young, healthy people
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DOI：
10.1016/j.apmr.2005.05.014
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发表时间：
2005-10-01
影响因子：
4.3
通讯作者：
Burnett, AF
中科院分区：
文献类型：
--
作者：
Doyle, TL;Newton, RU;Burnett, AF
目的：评估传统和分形维数测量安静站立压力中心（COP）的可靠性。设计：横断面研究。设置：大学实验室。参与者：30名年轻健康男性（n=20）和女性（n = 10）。（平均年龄，23岁）。干预措施：不适用。主要结果测量：在4种条件下记录了3项试验的COP：睁着眼睛，闭着眼睛站在坚实的泡沫表面上。传统的COP变量，峰值摇摆速度和摇摆范围，在前后（AP）和内外侧（ML）方向，和总偏移面积，和分形维数的COP在AP和ML方向进行了计算。结果：摇摆范围（AP）是最可靠的传统变量（组内相关系数模型2，1 [ICC2.1]范围-0.28至0.72）。峰值摇摆速度（AP）的可靠性最差（ICC 2.1范围，0.05 - 0.29）。只有1个传统变量具有出色的可靠性;总偏移面积（坚定，闭眼）（ICC2.1 = .95）。所有bar 1分形维数测量具有良好的ICC。分维测量的相对技术误差在4%~ 7%之间。变异系数在1.8%~ 6.7%之间。结论：分形维数测量COP比传统方法更可靠。尽管传统措施被广泛用于评估COP，但其可靠性值得怀疑。分形维数的措施表明，承诺可靠地量化COP，并保证进一步调查。
Objectives: To assess reliability of traditional and fractal dimension measures of quiet stance center of pressure (COP).Design: Cross-sectional study.Setting: University laboratory.Participants: Thirty young healthy men (n=20) and women (n = 10) (mean age, 23y).Interventions: Not applicable.Main Outcome Measures: COP was recorded for 3 trials across 4 conditions: eyes open and eyes closed standing on firm and foam surfaces. Traditional COP variables-peak sway velocity and range of sway, both in the anteroposterior (AP) and mediolateral (ML) directions, and total excursion area, and fractal dimension of the COP in the AP and ML directions - were calculated. Reliability statistics were calculated.Results: Range of sway (AP) was the most reliable traditional variable (intraclass correlation coefficient model 2,1 [ICC2.1] range - .28 to .72.). Peak sway velocity (AP) had poorest reliability (ICC2.1 range, .05- .29). Only 1 of the traditional variables had excellent reliability; total excursion area (firm, eyes closed) (ICC2.1 = .95). All bar 1 fractal dimension measures had excellent ICCs. Relative technical error of measurement ranged from 4% to 7% for the fractal dimension measures. Coefficients of variation were also very good, ranging from 1.8% to 6.7%.Conclusions: Fractal dimension measures were more reliable than traditional measures of COP. Although traditional measures are used extensively to assess COP, their reliability is questionable. Fractal dimension measures show promise to reliably quantify COP and warrant further investigation.