Abstract
The measurement of the center of pressure (CoP) is one of the most frequently used quantitative methods for quantifying postural performance. Due to the complexity and the high biological variability of the postural control loop, a large number of different methods and parameters have been established to describe the CoP process. Furthermore, the methodological conditions such as the foot position, visual condition, sampling duration, and the data processing also have a relevant influence on the measurement results. In addition, there are various methods for recording the pressure curve, which differ in particular with regard to the filters used, the frequencies, and measurement times. The aim of the present study was the methodical comparison between different digital filters, measurement frequencies and times, and their effects on the CoP process based on a healthy reference group. The data acquisition was done with LabVIEW and the data storage was organized in a subject oriented data structure. Based on the presented results it could be seen that with a different dominant frequency in the spectrum of the group of test persons, certain filter types are required for the processing of CoP data. In the sampling range from 300 Hz to 1 kHz in the bipedal stand and 600 Hz to 1 kHz in the monopedal stand, the choice of measurement frequency had no influence on the filter result.
Highlights
Clinical research is increasingly based, depending on the research question, on the collection of quantitative measurement variables
This dependence on the measurement time can be proven for a large number of measurement methods such as the measurement of stability using the center of pressure (CoP) [1]
The aim of this study was to provide possible recommendations regarding the choice of appropriate parameters for the CoP track
Summary
Clinical research is increasingly based, depending on the research question, on the collection of quantitative measurement variables Many of these parameters in the medical context appear to be time-constant, but have a time-dependent component when analyzed in detail. The measurement period in which these signals are observed must always be correctly determined in order to obtain the optimum measurement result with the highest significance. This dependence on the measurement time can be proven for a large number of measurement methods such as the measurement of stability using the center of pressure (CoP) [1]. The quantification of the CoP trajectory by means of a force plate is an established procedure in posturography, and is carried out by means of various parameters and methods, which will be presented and analyzed in the context of this study
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