Carlos-Augusto Gonzalez-Correa

University of Caldas

Different pathological changes in the large intestine wall, associated with the development of different chronic diseases, including colorectal cancer, could be reflected in electrical bioimpedance readings. Thickness and composition of the mucus bilayer covering it in the luminal side, abundance of bacteria of the intestinal microbiota, the permea...

span lang="EN-US">Using wireless sensors for brain activity, brain signals associated with the mood states of engineering students have been captured before and during the taking of a mathematics exam. The characterization of brain lobule activity related to arousal/valence states was analyzed from reports on the literature of the horizontal dimens...

Background The colon is now considered as key to wellbeing, health and disease and intestinal microbiota (IM) modulation is becoming a therapeutic target for some medical conditions. Interventions for this modulation range from the traditional ones based basically on diet and exercise, to intestinal fecal (microbiota/microbiome) transplantations, t...

This study tests the geometrical parameterization method for Electrical Bio-Impedance Spectroscopy (EBIS) readings previously proposed by one of the authors. This method uses the data of just three frequencies (therefore called 3P method). The test was carried out by the analysis of parameterization from 26 spectra (selected from 13 data sets) by t...

In this article, the process and results of a literature search using a new proposed scientific literature search tool (ToS: Tree of Science) aimed at partially overcoming the need to search in different databases was used. In its present form, ToS needs, as input, a previous search in the Web of Science (WoS), and by means of all references used i...

Objective: to describe a simple and straightforward method to calculate the circle parameters that can be used to fit Electrical Bioimpedance Spectroscopy (EBIS) raw data to the complex plane and remove the hook effect, a deviation of that model especially seen at higher frequencies and considered as an artifact due to instrumental limitations. A...

Bioimpedance spectroscopy has been used to evaluate and characterize the integrity of different tissues and organs, as well as to detect tissue structural alterations. The tissue electrical model alterations as an influence of the anisotropy of the tissue structure and its intrinsic metabolism on the degradation dynamic have not been completely und...

Obesity affects millions of people worldwide, becoming a public health problem with serious implications for human life quality. This is why low-cost prevention and diagnostic strategies that are accessible to the entire population are needed. Low-cost and easy-to-use strategies include the measurement of Body Mass Index (BMI) and measurement of wa...

In GruBIE we are interested in finding the best conditions to, in the future, carry out in vivo transendoscopic measurements on the colon wall in humans. Pressure applied by the probe to the tissue being measured and probe/electrodes size, as well as thickness of the large intestine (LI) wall may well play a crucial role in the values obtained when...

Some medical and physiological conditions like diabetic foot ulcers (DFU), fractures, skin cancer, as well as higher physical lateral development of one side of the body in sports like soccer, have an unilateral presentation and frequently in one of the limbs. Electrical bio-impedance (EBI) can be useful in the diagnosis or follow up of some of the...

The colon is inhabited by circa ten bacteria for each cell of our organism (microbiota) and it is estimated that, altogether, they posses between 100 to 150 times more genes (microbiome) that the human genome. Between these two sets of genomes, acting as a biological interface, there is a mucus bilayer biochemically structured by the Mucin 2 glycop...

Introduction: Fibromyalgia (FM) is a condition characterized by chronic widespread pain and generalized tenderness accompanied by fatigue, disturbed sleep and cognitive difficulties. Several types of muscle abnormalities have been reported in FM at tissue, cellular and subcellular level, which could eventually alter the passive electrical response...

Bioelectrical impedance analysis (BIA) is a noninvasive method for assessment of body composition with better accuracy, and less inter-observer error than anthropometry. Despite these advantages, reported BIA equations may not be suitable for populations other than where they were developed. The aim of this study was to develop equations for single...

Colorectal cancer is the third most common cancer worldwide. Tests available for screening this cancer have low sensitivity or are challenging and costly to implement. Based on the concept of field cancerization, or carcinogenic field effect, the possibility of early detection of cancer by electrical bioimpedance spectroscopy measurements on the re...

Diabetic foot (DF) is a complication of people suffering from diabetes mellitus (DM) with an overall prevalence estimated as 6.3%. Healing of diabetic ulcers takes several weeks, and follow up is needed both to assess the improvement of the wound and to detect possible complications. Ulcer diameter, pH and temperature have been used for such purpos...

The aim of this chapter is to give a general view of different applications where EBI and EBIS can play a role. We offer a global glimpse to the readers and some bibliographic references on them, so that, if somebody has a particular interest, he/she can have an initial approach into it. Applications of electrical impedance tomography (EIT) are not...

The hypothesis being advanced in this paper is that there is a new medical paradigm emerging from the biomedical research carried out in this century, mainly due to the explosion of the so called “omics” and associated techniques. The main idea is that there is a common pathway from wellbeing and health to chronic disease (“chonopathy”) and even to...

Electrical impedance myography is a novel, fast, easy to use, non-invasive and painless technique that provides information on tissue structure not measurable using other electro-diagnostic techniques. While it is still under development, studies and publications on the subject allow visualizing their potential application in clinical practice....

Abstract Field cancerization is a concept used to explain cellular and molecular alterations in tissue associated to neoplasia and cancer. This effect was proposed by Slaughter in order to explain the development of multiple primary tumors and locally recurrent cancer. The particular changes associated with this effect, in each type of cancer, have...

Segmental Bioelectrical Impedance Analysis (SBIA) has been proposed as an alternative to overcome some limitations of total BIA measurements for the calculations of body composition. It also has been used in different clinical conditions such as ascites, edema, neuromuscular damage, and during hemodialysis. There is no agreement about the best elec...

Until very recently, the colon was a neglected organ in science. During the present century, it has gained much attention, due to its role in health and disease, especially because of the presence of the microbiota. The interaction between the latter and human cells is made basically through the paracellular pathway; therefore, the permeability of...

Worldwide, colorectal cancer (CRC) is one of the leading causes of morbidity and mortality, ranking third among the most common cancers. Although screening programs are useful in reducing its impact, the screening tools available at present are far from being ideal. This justifies the search for new screening tools, and the authors think that Elect...

Fibromyalgia (FM) is a condition characterized by chronic widespread pain and generalized tenderness, accompanied by fatigue, sleep disturbances and cognitive difficulties. The diagnosis is merely clinical, as no confirmatory objective method is available so far. Several types of muscle abnormalities have been reported in FM, at tissue, cellular an...

Several studies positively relate high emotional intelligence (EI) with more physical exercise practice (PE). However, studies on the benefits of PE in EI are more limited. Between 2009 and 2012, twenty five university students participated in a program of PE for 30 minutes 5 times a week for 6 weeks. The changes found in the components of IE after...

El moco intestinal humano está formado, esencialmente, por una red de la glicoproteína Mucina2, en la cual se encuentran inmersas muchas otras proteínas de menor peso molecular. El objetivo principal del presente trabajo es realizar una contribución al estudio proteómico del moco intestinal humano, mediante la comparación de dos métodos de recolecc...

Objetivo: Analizar la producción científica en la Facultad de Ciencias para la Salud de la Universidad de Caldas (Manizales, Colombia) entre los años 1996-2009, a la luz de indicadores internacionales. Materiales y métodos: Se utilizaron los indicadores definidos en la plataforma SCIMAGO: Índice h, Producción Científica, Colaboración Internacional,...

A previous study showed that reported BIA equations for body composition are not suitable for Colombian population. The purpose of this study was to develop and validate a preliminary BIA equation for body composition assessment in young females from Colombia, using hydrodensitometry as reference method. A sample of 30 young females was evaluated....

Several studies have shown that the accuracy of BIA results depends of ethnicity, age, gender, hormonal and genetic variations and, so far, there are not specific equations for Colombian population. The purpose was to evaluate reported BIA equations to determine their usefulness in body composition assessment in young females from Colombia using hy...

Electrical properties of normal and neoplastic cervical tissues in a heterogeneous group of 56 Colombian women were studied by electrical impedance spectroscopy and a model based on the Generalized Effective-Medium Theory of Induced Polarization (GEMTIP). Differences between the electrical bioimpedance spectra were correlated with cellular and tiss...

A previous study showed that reported BIA equations for body composition are not suitable for Colombian population. The purpose of this study was to develop and validate a preliminary BIA equation for body composition assessment in young females from Colombia, using hydrodensitometry as reference method. A sample of 30 young females was evaluated....

BIA is a safe, noninvasive, portable and relatively inexpensive method of estimating body composition that is practical and suitable for individual use and large-scale studies. However, the cost of the electrodes recommended by some BIA manufacturers is too high for developing countries; where very often the long and complicated process of importat...

Electrical Impedance Spectroscopy (EIS) allows the study of the electrical properties of materials and structures such as biological tissues. EIS can be used as a diagnostic tool for the identification of pathological conditions such as cervical cancer. We used EIS in combination with genetic algorithms to characterize cervical epithelial squamous...

Are reported the results of a study about the properties of cervical epitelial tissue using electrical impeditivity spectroscopy, with the objective of studying the early detection of intraepithelial neoplasia, with this metled. 636 impedivity spectrums from 53 patients at Liga Santandereana de Lucha contra el cancer were measured and compared with...

Aim: To assess the quality of reports where bioelectrical impedance analysis and dilution techniques were used to estimate body fluid volumes. Methods: From electronic searches of MEDLINE, the Cochrane Library, CINAHL, BIOSIS, EMBASE, and PROQUEST we identified 50 studies published between 2002 and 2007. The quality of reporting was assessed by usi...

RESUMEN La hiperadiposidad o exceso de grasa corporal, usualmente clasificada como sobrepeso u obesidad, se ha constituido en una pandemia a la cual algunos autores han dado el nombre de Globesidad (obesidad global). Este enorme problema de salud pública afecta no sólo al mundo desarrollado, sino, igualmente, al mundo en vías de desarrollo. Tradici...

With the worldwide epidemic growth of obesity prevalence, nutritional assessment has become of paramount importance, both clinically and epidemiologically. Bioelectrical Impedance Analysis (BIA) is an alternative for the calculation of % Body Fat (%BF), but, so far, it requires population specific predictive formulae [1]. Until these are developed...

Impedance spectra of superficial tissues can be used to detect pre-malignant changes in the cervix but require electrical contact to be made between a probe and the tissue. Using a membrane which is permeable to ions but forms a barrier to agents of infection should enable impedance spectra to be measured without causing an infection risk to the pa...

Electrical bioimpedance spectroscopy (EBIS) is a technique that uses a probe to calculate the transfer impedance from tissues. This transfer impedance can give information about the normal or pathological condition of the tissue. To take readings, pressure has to be applied to the probe in order to get a good contact between the electrodes and the...

There is an argument that the universe functions according to binary principles. This paper applies such a system of evaluation to the interpretation of acupuncture principles, the t'ai chi symbol and the I Ching. As a result, it can be shown that a coherent and interesting ordering of some earthly phenomena can be reached. When these same principl...

Biological tissues undergoing inflammation and dysplasia seem to exhibit changes in the intercellular space that can be sensed using low frequency electrical impedance methods. Basically, low frequency electric current flows through this space and its widening as well as the disruption of the tight junction decrease the resistance, facilitating cur...

This paper reports a preliminary finding associated with an investigation of how tissues respond to mechanical stress. The stress distribution within the tissue may be the result of normal function, for example, joint forces, or it may result from interventions such as tissue suturing during or after surgery. We sought to combine electrical and mec...

It has previously been shown that it is possible to differentiate between squamous and columnar epithelia in rat and resected human tissues using an impedance probe to make in vitro measurements. This probe can be passed down an endoscope allowing measurements to be made in patients. However, the probe emerges parallel to the oesophageal wall, with...

An EIT system has been produced that has been optimized for imaging impedance changes with scalp electrodes during brain activity in ambulant subjects. It can record from 225 Hz to 65 kHz, has a small headbox on a lead 10 m long, and has software programmable electrode selection. In calibration experiments in a small cylindrical tank filled with po...

Preliminary results of electrical impedance measurements in squamous and columnar epithelia in rat and human tissues are presented. The aim of this work is to show the possibility of differentiating these two types of epithelia in terms of their electrical characteristics. For the measurements, we employed a 1.95m-long, 3.2-mm-diameter, four-electr...