Abstract
The idea of a device for measuring the impedance of human body with the target of monitoring the respiratory and heart rate is proposed in this paper. Hardware realization of the proposed idea is described with the illustration of the custom designed printed circuit board. Preparation of electrode shirts with various electrode placement configurations is introduced. Series of experimental measurements in the cases of dynamic bioimpedance reference and single human subject are described and results shown to evaluate the custom made device. The excitation frequencies in the range of 2 MHz–20 MHz are utilized in the cases of large foil and textile electrodes to focus on the use of the capacitive connection to the object – constituting the novelty of the current paper. The results are analysed concerning the dependency of the visual availability of the interesting signal of breathing and heart rate of the material and the placement of the electrodes. Availability of breathing is found to be evident in all of the experimented cases. The heart rate is found to be challenging because of the presence of high frequency noise.DOI: http://dx.doi.org/10.5755/j01.eie.23.3.18330
Highlights
The monitoring of the vital signs has gained great interest in recent years – mainly because of the increasing availability of commercial smart monitoring devices and the wide spread usage of smartphones
Several approaches are available for accessing to the respiratory rate (RR) and heart rate (HR): piezo-resistive belt [1], different optical methods [2], inductive sensors [3] etc
Measurement experiments were carried out to evaluate the capability of the implemented measurement device to follow the RR and HR in the cases of dynamic bioimpedance reference (DBR) and single volunteer
Summary
The monitoring of the vital signs has gained great interest in recent years – mainly because of the increasing availability of commercial smart monitoring devices and the wide spread usage of smartphones. The interest in personal health has grown through the self-awareness of the healthy lifestyle and the change of the daily movement habits in developed countries. A possibility of measuring the electrical bioimpedance (EBI) for tracking the changes of impedance of human body, caused by RR and HR, proposes an alternative. There are number of papers, describing the ideas and realizations of wearable measurement devices, developed for monitoring the vital signs of human by using the EBI. The work was partly financed through the European Research Area project H2020WIDESPREAD-2014-2-668995-Cognitive Electronics
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