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Technologies 2018, 6(2), 56; https://doi.org/10.3390/technologies6020056

Validation of Various Filters and Sampling Parameters for a COP Analysis

1
University Center for Orthopedic and Trauma Surgery, Faculty of Medicine Carl Gustav Carus, Technische Universität Dresden, 01307 Dresden, Germany
2
Institute of Electrical Systems and Energy Logistics, Faculty of Mechanical Engineering, Electrical and Energy Systems, Brandenburg University of Technology Cottbus-Senftenberg, 01968 Senftenberg, Germany
3
SLG Prüf- und Zertifizierungs GmbH, Medical Devices and Laser Safety, 09232 Hartmannsdorf, Germany
*
Author to whom correspondence should be addressed.
Received: 16 April 2018 / Revised: 10 June 2018 / Accepted: 11 June 2018 / Published: 13 June 2018
(This article belongs to the Special Issue Medical Imaging & Image Processing Ⅱ)
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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. View Full-Text
Keywords: COP; force plate; AMTI; Kistler; center of pressure; postural control; balance; filter; Butterworth; sampling duration effect COP; force plate; AMTI; Kistler; center of pressure; postural control; balance; filter; Butterworth; sampling duration effect
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Koltermann, J.J.; Gerber, M.; Beck, H.; Beck, M. Validation of Various Filters and Sampling Parameters for a COP Analysis. Technologies 2018, 6, 56.

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