Design and Evaluation of an Electrical Bioimpedance Device Based on DIBS for Myography during Isotonic Exercises

Vinicius Sirtoli,Kaue Morcelles,Pedro Bertemes-Filho,John Gomez

doi:10.3390/jlpea8040050

Vinicius Sirtoli, Kaue Morcelles + Show 2 more

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https://doi.org/10.3390/jlpea8040050

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Abstract

Electrical Bioimpedance Spectroscopy (EIS) is a technique used to assess passive electrical properties of biological materials. EIS detects physiological and pathological conditions in animal tissues. Recently, the introduction of broadband excitation signals has reduced the measuring time for application techniques such as Electrical Bioimpedance Myography. Therefore, this work is aimed at proposing a prototype by using discrete interval binary sequences (DIBS), which is based on a system that holds a current source, impedance acquisition system, microcontroller and graphical user interface. Measurements between 5 Ω to 5 kΩ had impedance acquisition and phase angle errors of aproximately 2% and were lower than 3 degrees, respectively. Based on a proposed circuit, bioimpedance of the chest muscle (Pectoralis Major) was measured during isotonic exercise (push-up). As a result, our analyses have detected tiredness and fatigue. We have explored and proposed new parameters which assess such conditions, as both the maximum magnitude and tiredness coefficient. These parameters decrease exponentially with consecutive push-ups and were convergent in the majority of the sixteen days of measurement.

Highlights

The electrical bioimpedance is the capability that biological materials have to oppose the passage of an electrical current [1]
We describe each stage required in device implementation and how to carefully use the discrete interval binary sequences (DIBS)
We developed an Electrical Bioimpedance Myography (EBIM) prototype based on a broadband excitation signal (DIBS) to monitor muscle physiological conditions; the range of operation for impedance is 5 Ω to 5 kΩ

Summary

Introduction

The electrical bioimpedance is the capability that biological materials have to oppose the passage of an electrical current [1]. The intracellular fluids, extracellular fluids and the cell membrane determine the electrical conductivity in biological tissues. These fluids have ions able to move freely, transporting charges [2]. The cell membrane has small channels that allow the flux of ions between the inside and outside [3]. The bioimpedance depends on the tissue physical and chemical structures, like size and shape [4], and on environmental factors like humidity and temperature

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