Journal of Electrical Bioimpedance最新文献_第10页

Investigation of Physiological Swelling on Conductivity Distribution in Lower Leg Subcutaneous Tissue by Electrical Impedance Tomography. 电阻抗断层扫描研究生理性肿胀对小腿皮下组织电导分布的影响。

Journal of Electrical Bioimpedance Pub Date : 2020-05-14 eCollection Date: 2020-01-01 DOI: 10.2478/joeb-2020-0004

R Ogawa, M R Baidillah, S Akita, M Takei

{"title":"Investigation of Physiological Swelling on Conductivity Distribution in Lower Leg Subcutaneous Tissue by Electrical Impedance Tomography.","authors":"R Ogawa, M R Baidillah, S Akita, M Takei","doi":"10.2478/joeb-2020-0004","DOIUrl":"https://doi.org/10.2478/joeb-2020-0004","url":null,"abstract":"There is a strong need for a non-invasive measurement technique that is capable of accurately identifying the physiological condition change or heterogeneity of subcutaneous adipose tissue (SAT) by localizing the abnormalities within the compartment. This paper aims to investigate the feasibility of Electrical Impedance Tomography (EIT) to assess the interstitial fluid in subcutaneous adipose tissue as an enhancement method of bioelectrical impedance spectroscopy (BIS). Here, we demonstrate the preliminary result of EIT with a wearable 16 electrodes sensor. The image-based reference EIT with fat weighted threshold method is proposed. In order to evaluate the performance of our novel method, a physiological swelling experiment is conducted, and Multi-Frequency Bioelectrical Impedance Analysis (MFBIA) is also applied as a comparison with EIT results. The experimental results showed that the proposed method was able to distinguish the physiological swelling condition and effectively to remove the unexpected background noise. Furthermore, the conductivity variation in the subcutaneous layer had a good correlation with extracellular water volume change from MFBIA data; the correlation coefficient R2 = 0.927. It is concluded that the proposed method provides a significant prospect for SAT assessment.","PeriodicalId":38125,"journal":{"name":"Journal of Electrical Bioimpedance","volume":" ","pages":"19-25"},"PeriodicalIF":0.0,"publicationDate":"2020-05-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ftp.ncbi.nlm.nih.gov/pub/pmc/oa_pdf/0a/49/joeb-11-019.PMC7531098.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"25368846","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 8

Assessment of Body Composition and Nutritional Risks in Young Ballet Dancers - The Bioelectrical Impedance Analysis. 评估年轻芭蕾舞演员的身体成分和营养风险--生物电阻抗分析。

Journal of Electrical Bioimpedance Pub Date : 2020-05-14 eCollection Date: 2020-01-01 DOI: 10.2478/joeb-2020-0005

Maria Alessandra Gammone, Nicolantonio D'Orazio

{"title":"Assessment of Body Composition and Nutritional Risks in Young Ballet Dancers - The Bioelectrical Impedance Analysis.","authors":"Maria Alessandra Gammone, Nicolantonio D'Orazio","doi":"10.2478/joeb-2020-0005","DOIUrl":"10.2478/joeb-2020-0005","url":null,"abstract":"Background: Young ballet dancers are at risk of health issues associated with altered nutritional status and of relative energy deficiency in sport compared to the general population.Aim: To evaluate the nutritional status and body composition in ballet dancers.Materials and methods: The study group consisted of 40 young ballet dancers (mean age 19.97 years). Height and weight were measured and body mass index was calculated in all subjects (mean BMI value 19.79 kg/m2, SD: 2.051). Body composition was estimated using the bioelectrical impedance method.Results: The dancers' fat-free mass was 47.33 kg (SD: 5.064) and, on the average, body fat represented the 15.92% (SD: 16.91) of their body weight.Conclusions: Ballet dancers, who usually show significantly lower BMI values compared to the general population, also displayed body fat values under the suggested range. Some screening for altered nutritional status should be performed. In addition, education programs should be recommended in young ballet dancers, in order to inform about energy and nutrition requirements for health and training and to prevent malnutrition-related problems.","PeriodicalId":38125,"journal":{"name":"Journal of Electrical Bioimpedance","volume":" ","pages":"26-30"},"PeriodicalIF":0.0,"publicationDate":"2020-05-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ftp.ncbi.nlm.nih.gov/pub/pmc/oa_pdf/cb/7d/joeb-11-026.PMC7531100.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"25368847","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Introducing the Hybrid "K-means, RLS" Learning for the RBF Network in Obstructive Apnea Disease Detection using Dual-tree Complex Wavelet Transform Based Features. 在阻塞性呼吸暂停疾病检测中引入基于双树复杂小波变换特征的 RBF 网络混合 "K-means、RLS "学习法

Journal of Electrical Bioimpedance Pub Date : 2020-03-18 eCollection Date: 2020-01-01 DOI: 10.2478/joeb-2020-0002

Javad Ostadieh, Mehdi Chehel Amirani

{"title":"Introducing the Hybrid \"K-means, RLS\" Learning for the RBF Network in Obstructive Apnea Disease Detection using Dual-tree Complex Wavelet Transform Based Features.","authors":"Javad Ostadieh, Mehdi Chehel Amirani","doi":"10.2478/joeb-2020-0002","DOIUrl":"10.2478/joeb-2020-0002","url":null,"abstract":"Apnea is one of the deadliest diseases that can be prevented and cured if it is detected in time. In this paper, we propose a precise method for early detection of the obstructive sleep apnea (OSA) disease using the latest feature selection and extraction methods. The feature selection in this paper is based on the Dual tree complex wavelet (DT-CWT) coefficients of the ECG signals of several patients. The feature extraction from these coefficients is done using frequency and time techniques. The Feature selection is done using the spectral regression discriminant analysis (SRDA) algorithm and the classification is performed using the hybrid RBF network. A hybrid RBF neural network is introduced in this paper for detecting apnea that is much less computationally demanding than the previously presented SVM networks. Our findings showed a 3 percent improvement in the detection and at least a 30 percent reduction in the computational complexity in comparison with methods that have been presented recently.","PeriodicalId":38125,"journal":{"name":"Journal of Electrical Bioimpedance","volume":" ","pages":"4-11"},"PeriodicalIF":0.0,"publicationDate":"2020-03-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ftp.ncbi.nlm.nih.gov/pub/pmc/oa_pdf/1b/27/joeb-11-004.PMC7531097.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"25368389","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Fast Electrical Characterization with Low Hardware Requirement. 快速电特性与低硬件要求。

Journal of Electrical Bioimpedance Pub Date : 2020-03-18 eCollection Date: 2020-01-01 DOI: 10.2478/joeb-2020-0001

Uwe Pliquett

引用次数: 0

Segmental Volume Changes that Occur in Nonhuman Primates During Short Term Head Up (HUT) and Head Down (HDT) Tilt. 非人类灵长类动物在短期头向上(HUT)和头向下(HDT)倾斜时发生的节段体积变化。

Journal of Electrical Bioimpedance Pub Date : 2020-01-01 DOI: 10.2478/joeb-2020-0003

Leslie David Montgomery, Clarence Oloff

{"title":"Segmental Volume Changes that Occur in Nonhuman Primates During Short Term Head Up (HUT) and Head Down (HDT) Tilt.","authors":"Leslie David Montgomery, Clarence Oloff","doi":"10.2478/joeb-2020-0003","DOIUrl":"https://doi.org/10.2478/joeb-2020-0003","url":null,"abstract":"Nonhuman primates are often used in biomedical research and to investigate physiologic processes that occur in man. Impedance plethysmography was used to measure calf, thigh, pelvic, abdominal, and thoracic volume changes in ten Rhesus and eight squirrel monkeys during five-minute exposures to HUT and HDT at angles of 5, 10, and 20 degrees. Calf, rump and tail measurements were made in three squirrel monkeys at 10 and 20 degrees of HUT and HDT. Fluid volume changes in all segments of the Rhesus monkeys were found to change during HUT an HDT in direct relation to the angle of tilt used. However, the volume changes that occurred in the squirrel monkeys were found to be quite different. Their calf, thigh, and pelvic segments lost volume during both HUT and HDT while their abdominal and thoracic segments responded similarly to those of the Rhesus monkeys. These results and those of the calf/tail measurements of the squirrel monkeys suggest that they may utilize their tails as a compensatory reservoir during postural changes and therefore, may not be an appropriate animal model for man under some orthostatic test conditions.","PeriodicalId":38125,"journal":{"name":"Journal of Electrical Bioimpedance","volume":"11 1","pages":"12-18"},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ftp.ncbi.nlm.nih.gov/pub/pmc/oa_pdf/57/fe/joeb-11-012.PMC7531102.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"10284371","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Narrowband Array Processing Beamforming Technique for Electrical Impedance Tomography. 用于电阻抗断层成像的窄带阵列处理波束成形技术。

Journal of Electrical Bioimpedance Pub Date : 2019-12-31 eCollection Date: 2019-01-01 DOI: 10.2478/joeb-2019-0014

Venkatratnam Chitturi, Nagi Farrukh

{"title":"Narrowband Array Processing Beamforming Technique for Electrical Impedance Tomography.","authors":"Venkatratnam Chitturi, Nagi Farrukh","doi":"10.2478/joeb-2019-0014","DOIUrl":"10.2478/joeb-2019-0014","url":null,"abstract":"Electrical impedance tomography (EIT) has a large potential as a two dimensional imaging technique and is gaining attention among researchers across various fields of engineering. Beamforming techniques stem from the array signal processing field and is used for spatial filtering of array data to evaluate the location of objects. In this work the circular electrodes are treated as an array of sensors and beamforming technique is used to localize the object(s) in an electrical field. The conductivity distributions within a test tank is obtained by an EIT system in terms of electrode voltages. These voltages are then interpolated using elliptic partial differential equations. Finally, a narrowband beamformer detects the peak in the output response signal to localize the test object(s). Test results show that the beamforming technique can be used as a secondary method that may provide complementary information about accurate position of the test object(s) using an eight electrode EIT system. This method could possibly open new avenues for spatial EIT data filtering techniques with an understanding that the inverse problem is more likely considered here as a source localization algorithm instead as an image reconstruction algorithm.","PeriodicalId":38125,"journal":{"name":"Journal of Electrical Bioimpedance","volume":"10 1","pages":"96-102"},"PeriodicalIF":0.0,"publicationDate":"2019-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ftp.ncbi.nlm.nih.gov/pub/pmc/oa_pdf/26/1b/joeb-10-096.PMC7851972.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"25367482","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

The Non-linear Electrical Properties of Silver/silver Chloride Electrodes in Sodium Chloride Solution. 氯化钠溶液中银/氯化银电极的非线性电特性。

Journal of Electrical Bioimpedance Pub Date : 2019-12-31 eCollection Date: 2019-01-01 DOI: 10.2478/joeb-2019-0017

Oliver Pabst, Abbas Anwar, Adam Andrzej Nieweglowski, Christian Rolid Lindland, Habibur Rahman, Håvard Siljedal, Henning Thorkildsen, Ibrahim Camara, Kosar Nozari Mirarkolaei, Léa Massé, Magnus Solvi Hoen, Mohsin Noman Mustafa, Ole Johan Berg, Petter André Kristiansen, Ramzi Iguenad, Robin Alexander Torstensson Pedersen, Serwa Waisi, Trym Erik Nielsen

{"title":"The Non-linear Electrical Properties of Silver/silver Chloride Electrodes in Sodium Chloride Solution.","authors":"Oliver Pabst, Abbas Anwar, Adam Andrzej Nieweglowski, Christian Rolid Lindland, Habibur Rahman, Håvard Siljedal, Henning Thorkildsen, Ibrahim Camara, Kosar Nozari Mirarkolaei, Léa Massé, Magnus Solvi Hoen, Mohsin Noman Mustafa, Ole Johan Berg, Petter André Kristiansen, Ramzi Iguenad, Robin Alexander Torstensson Pedersen, Serwa Waisi, Trym Erik Nielsen","doi":"10.2478/joeb-2019-0017","DOIUrl":"10.2478/joeb-2019-0017","url":null,"abstract":"An electrical measurement is non-linear when it is affected by the applied stimulus, i.e. when the measured phenomenon changes with amplitude. If pinched hysteresis loops can be observed in the voltage current representation, the underlying tissue can be classified as a memristor. Several biological memristors have been published, like human skin and apples. However, changes in the polarization impedance of electrodes may also cause pinched hysteresis loops. The question whether the reported biological memristors are real or whether the results just reflect changes in the polarization impedance arises. If the impedance of the measured object is close to or smaller than the polarization impedance of the used electrodes, the latter may dominate the measurement. In this study, we investigated the non-linear electrical properties of silver/silver chloride electrodes in a sodium chloride solution that has a similar concentration as human sweat and compared these to results from human skin. First of all, we found that silver/silver chloride electrodes in sodium chloride solution can be classified as memristors. However, the currents obtained from the sodium chloride solution are much higher than the currents recorded from human skin and there is a qualitative difference in the pinched hysteresis loops in both cases. We can conclude that the non-linear electrical measurements with silver/silver chloride on human skin are actually dominated by the skin and we can confirm that the human skin memristor really exists.","PeriodicalId":38125,"journal":{"name":"Journal of Electrical Bioimpedance","volume":"10 1","pages":"113-123"},"PeriodicalIF":0.0,"publicationDate":"2019-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ftp.ncbi.nlm.nih.gov/pub/pmc/oa_pdf/6a/61/joeb-10-113.PMC7851973.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"25368384","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A Circuit for Simultaneous Measurements of Skin Electrical Conductance, Susceptance, and Potential. 同时测量皮肤电导、电感和电位的电路。

Journal of Electrical Bioimpedance Pub Date : 2019-12-31 eCollection Date: 2019-01-01 DOI: 10.2478/joeb-2019-0016

Ørjan G Martinsen, Håvard Kalvøy, Dindar S Bari, Christian Tronstad

引用次数: 0

Machine Learning for Stem Cell Differentiation and Proliferation Classification on Electrical Impedance Spectroscopy. 基于电阻抗谱的干细胞分化和增殖分类的机器学习。

Journal of Electrical Bioimpedance Pub Date : 2019-12-31 eCollection Date: 2019-01-01 DOI: 10.2478/joeb-2019-0018

André B Cunha, Jie Hou, Christin Schuelke

引用次数: 6

Journal of Electrical Bioimpedance Pub Date : 2019-12-31 eCollection Date: 2019-01-01 DOI: 10.2478/joeb-2019-0020

Christian Tronstad, Jan Olav Høgetveit, Ole Elvebakk, Håvard Kalvøy

{"title":"Age-related Differences in the Morphology of the Impedance Cardiography Signal.","authors":"Christian Tronstad, Jan Olav Høgetveit, Ole Elvebakk, Håvard Kalvøy","doi":"10.2478/joeb-2019-0020","DOIUrl":"10.2478/joeb-2019-0020","url":null,"abstract":"Impedance cardiography (ICG) is a non-invasive method of hemodynamic measurement, mostly known for estimation of stroke volume and cardiac output based on characteristic features of the signal. Compared with electrocardiography, the knowledge on the morphology of the ICG signal is scarce, especially with respect to age-dependent changes in ICG waveforms. Based on recordings from ten younger (20-29 years) and ten older (60-79) healthy human subjects after three different levels of physical activity, the typical interbeat ICG waveforms were derived based on ensemble averages. Comparison of these waveforms between the age groups indicates the following differences: a later initial upward deflection for the younger group, an additional hump in the waveform from many older subjects not presented in the younger group, and a more pronounced second wave in the younger group. The explanation for these differences is not clear, but may be related to arterial stiffness. Further studies are suggested to determine whether these morphological differences have clinical value.","PeriodicalId":38125,"journal":{"name":"Journal of Electrical Bioimpedance","volume":"10 1","pages":"139-145"},"PeriodicalIF":0.0,"publicationDate":"2019-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ftp.ncbi.nlm.nih.gov/pub/pmc/oa_pdf/cd/36/joeb-10-139.PMC7851975.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"25368387","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0