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- Title
Validation of Various Filters and Sampling Parameters for a COP Analysis.
- Authors
Koltermann, Jan Jens; Gerber, Martin; Beck, Heidrun; Beck, Michael
- Abstract
The center of pressure (CoP) is one of the most utilized quantitative measurements describing postural competency. Due to the complexity and biological variability of postural regulatory systems, a myriad of different methods and parameters have been established describing the CoP trajectory. Besides procedural variables, such as foot position, visual condition, and sampling duration, the method of data collection itself has a relevant effect on the result of the measurement. Furthermore, different methods for recording the measured data have been developed, which differ regarding the filters, frequencies, and test durations used. The goal of this study was the methodical comparison of various filters, measurement frequencies, and measurement duration, with respect to their effects on the CoP trajectory. Based on the results presented, we demonstrate that the Butterworth and Bessel filters can be recommended for analysis of CoP data, and at the very least, a second-order filter should be chosen for the process. For assessment of the cutoff frequency, a technical pendulum was used to show that a cutoff frequency of 13 Hz provided reliable data and it can be inferred that a 100 Hz sampling rate would be the minimum requirement.
- Subjects
ACQUISITION of data; STATISTICAL sampling; BUTTERWORTH filters (Signal processing); STRUCTURAL plates; PARAMETERS (Statistics)
- Publication
Technologies (2227-7080), 2018, Vol 6, Issue 2, p56
- ISSN
2227-7080
- Publication type
Article
- DOI
10.3390/technologies6020056