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Bioimpedance spectroscopy

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https://www.readbyqxmd.com/read/27869707/ex-vivo-characterization-of-bioimpedance-spectroscopy-of-normal-ischemic-and-hemorrhagic-rabbit-brain-tissue-at-frequencies-from-10-hz-to-1-mhz
#1
Lin Yang, Ge Zhang, Jiali Song, Meng Dai, Canhua Xu, Xiuzhen Dong, Feng Fu
Stroke is a severe cerebrovascular disease and is the second greatest cause of death worldwide. Because diagnostic tools (CT and MRI) to detect acute stroke cannot be used until the patient reaches the hospital setting, a portable diagnostic tool is urgently needed. Because biological tissues have different impedance spectra under normal physiological conditions and different pathological states, multi-frequency electrical impedance tomography (MFEIT) can potentially detect stroke. Accurate impedance spectra of normal brain tissue (gray and white matter) and stroke lesions (ischemic and hemorrhagic tissue) are important elements when studying stroke detection with MFEIT...
November 18, 2016: Sensors
https://www.readbyqxmd.com/read/27861264/use-of-b-mode-ultrasound-as-a-body-fat-estimate-in-collegiate-football-players
#2
Parker N Hyde, Kristina L Kendall, Ciaran M Fairman, Nicholas A Coker, Mary E Yarbrough, Steve J Rossi
Hyde, PN, Kendall, KL, Fairman, CM, Coker, NA, Yarbrough, ME, and Rossi, SJ. Utilization of B-mode ultrasound as a body fat estimate in collegiate football players. J Strength Cond Res 30(12): 3525-3530, 2016-The purpose of the present study was to validate a 7-site ultrasound imaging protocol to predict the percent body fat (%BF) in a division I football team. Body composition was estimated by ultrasound, 7-site skinfolds, and the 3-compartment-water (3C-W) model of Siri, using bioimpedance spectroscopy to estimate the total body water and air displacement plethysmography (using BODPOD) to determine the body density...
December 2016: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/27832647/extracellular-volume-overload-and-increased-vasoconstriction-in-patients-with-recurrent-intradialytic-hypertension
#3
Peter Noel Van Buren, Yunyun Zhou, Javier A Neyra, Guanghua Xiao, Wanpen Vongpatanasin, Jula Inrig, Robert Toto
BACKGROUND/AIMS: Intradialytic hypertension (IH) occurs frequently in some hemodialysis patients and increases mortality risk. We simultaneously compared pre-dialysis, post-dialysis and changes in extracellular volume and hemodynamics in recurrent IH patients and controls. METHODS: We performed a case-control study among prevalent hemodialysis patients with recurrent IH and hypertensive hemodialysis controls. We used bioimpedance spectroscopy and impedance cardiography to compare pre-dialysis, post-dialysis, and intradialytic change in total body water (TBW) and extracellular water (ECW), as well as cardiac index (CI) and total peripheral resistance index (TPRI)...
November 11, 2016: Kidney & Blood Pressure Research
https://www.readbyqxmd.com/read/27828939/determinants-of-body-composition-in-breastfed-infants-using-bioimpedance-spectroscopy-and-ultrasound-skinfolds-methods-comparison
#4
Zoya Gridneva, Anna R Hepworth, Leigh C Ward, Ching T Lai, Peter E Hartmann, Donna T Geddes
BACKGROUND: Accurate, non-invasive and inexpensive methods are required to measure infant body composition. Ultrasound and bioimpedance spectroscopy (BIS) have been validated in adults and introduced in pediatric populations. The aim of this study was to evaluate the performance of both methods in determining percentage fat mass (%FM) in breastfed infants. METHODS: %FM of 2, 5, 9 and 12 month-old healthy, breastfed term infants (n = 58) was calculated using BIS-derived total body water equations and skinfold equations and compared to reference models...
November 9, 2016: Pediatric Research
https://www.readbyqxmd.com/read/27821919/bioelectrical-impedance-analysis-for-severe-stroke-patients-with-upper-extremity-hemiplegia
#5
Chanuk Yoo, Jaehyung Kim, Yeongae Yang, Jinsu Lee, Gyerok Jeon
[Purpose] This study is to analyze bioimpedance parameters and occupational assessment for severe stroke patients with upper extremity hemiplegia. [Subjects and Methods] Experimental subjects were 20 hemiplegic stroke patients receiving rehabilitation therapy between November to October, 2015. Prediction marker (PM), and phase angle (θ), a nd characteristic frequency (fc) were measured using bioelectrical impedance spectroscopy (MultiScan 5000). Bioelectrical impedance vector analysis (BIVA) was also obtained from the bioimpedance data...
October 2016: Journal of Physical Therapy Science
https://www.readbyqxmd.com/read/27811407/improved-electrode-positions-for-local-impedance-measurements-in-the-lung-a-simulation-study
#6
Jakob Orschulik, Rudolf Petkau, Tobias Wartzek, Nadine Hochhausen, Michael Czaplik, Steffen Leonhardt, Daniel Teichmann
Impedance spectroscopy can be used to analyze the dielectric properties of various materials. In the biomedical domain, it is used as bioimpedance spectroscopy (BIS) to analyze the composition of body tissue. Being a non-invasive, real-time capable technique, it is a promising modality, especially in the field of lung monitoring. Unfortunately, up to now, BIS does not provide any regional lung information as the electrodes are usually placed in hand-to-hand or transthoracic configurations. Even though transthoracic electrode configurations are in general capable of monitoring the lung, no focusing to specific regions is achieved...
November 4, 2016: Physiological Measurement
https://www.readbyqxmd.com/read/27806008/impact-of-measured-vs-predicted-residual-lung-volume-on-body-fat-percentage-via-underwater-weighing-and-four-compartment-model
#7
Brett S Nickerson, Michael R Esco, Phillip A Bishop, Randall E Schumacker, Mark T Richardson, Michael V Fedewa, Jonathan E Wingo, Bailey A Welborn
The purpose of this study was to compare underwater weighing (UWW) and four-compartment (4C) model body fat percentage (BF%) for predicted vs. simultaneously measured residual lung volume (RLV). Forty-seven women and thirty-three men (age=22±5 years) had UWW and 4C model BF% determined using Boren et al. (RLVBOREN), Goldman and Becklake (RLVGB), and Miller et al. (RLVMILLER) RLV prediction equations. Criterion UWW BF% included body density (BD) values with simultaneous RLV. Criterion 4C model BF% included BD via UWW with simultaneous RLV, total body water via bioimpedance spectroscopy, and bone mineral content via dual energy x-ray absorptiometry...
October 27, 2016: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/27798648/association-of-fluid-status-and-body-composition-with-physical-function-in-patients-with-chronic-kidney-disease
#8
Shih-Ming Hsiao, Yi-Chun Tsai, Hui-Mei Chen, Ming-Yen Lin, Yi-Wen Chiu, Tzu-Hui Chen, Shu-Li Wang, Pei-Ni Hsiao, Lan-Fang Kung, Shang-Jyh Hwang, Mei-Feng Huang, Yi-Chun Yeh, Cheng-Sheng Chen, Mei-Chuan Kuo
BACKGROUND: Impairment of physical function and abnormal body composition are the major presentations in patients with chronic kidney disease (CKD). The aim of this study is to investigate the relationship between body composition and physical function in CKD patients. METHODS: This cross-sectional study enrolled 172 of CKD stages 1-5 from February 2013 to September 2013. Handgrip strength (upper extremity muscle endurance), 30-second chair-stand test (lower extremity muscle endurance) and 2-minute step test (cardiorespiratory endurance) were used as indices of physical function...
2016: PloS One
https://www.readbyqxmd.com/read/27793064/hypertrophy-type-resistance-training-improves-phase-angle-in-young-adult-men-and-women
#9
A S Ribeiro, A Avelar, L Dos Santos, A M Silva, L A Gobbo, B J Schoenfeld, L B Sardinha, E S Cyrino
The main purpose of the present study was to investigate the effect of a hypertrophy-type resistance training protocol on phase angle, an indicator of cellular integrity, in young adult men and women. 28 men (22.2±4.3 years, 67.8±9.0 kg and 174.2±6.8 cm) and 31 women (23.2±4.1 years, 58.7±12.1 kg and 162.7±6.4 cm) underwent a progressive RT for 16 weeks (2 phases, 8 weeks each), 3 times per week, consisting of 10 to 12 whole body exercises with 3 sets of 8-12 repetitions maximum. Phase angle, resistance, reactance and total body water (intra and extracellular water compartments) were assessed by bioimpedance spectroscopy (Xitron 4200 Bioimpedance Spectrum Analyzer)...
October 28, 2016: International Journal of Sports Medicine
https://www.readbyqxmd.com/read/27677366/changes-in-body-composition-following-haemodialysis-as-assessed-by-bioimpedance-spectroscopy
#10
K Tangvoraphonkchai, A Davenport
BACKGROUND/OBJECTIVES: Patients with chronic kidney disease treated by haemodialysis (HD) are at increased risk of sarcopenia. Bioelectrical impedance spectroscopy (BIS) can be used to determine body composition, and is one of the several potential screening tools for sarcopenia. The newer generation of portable hand-held devices can be readily used in dialysis centres. The results from BIS devices using a two-compartmental model of body composition can be affected by hydration status and so ideally measurements should be made when patients are not overhydrated...
September 28, 2016: European Journal of Clinical Nutrition
https://www.readbyqxmd.com/read/27673568/intrarater-reliability-of-tonometry-and-bioimpedance-spectroscopy-to-measure-tissue-compressibility-and-extracellular-fluid-in-the-legs-of-healthy-young-people-in-australia-and-myanmar
#11
Janet Douglass, Patricia Graves, Susan Gordon
BACKGROUND: Measurements of tissue compressibility and extracellular fluid (ECF) are used to monitor progression of lymphedema, a chronic swelling of the subcutaneous tissue. Later stages of lymphedema are characterized by fibrotic induration in the subcutis and hyperkeratosis of the skin. Several devices are available to measure these changes, but previous reliability and validity studies have been conducted primarily on adult women with unilateral arm lymphedema using contralateral limbs as controls...
September 27, 2016: Lymphatic Research and Biology
https://www.readbyqxmd.com/read/27670250/phase-angle-and-impedance-ratio-reference-cut-points-from-the-united-states-national-health-and-nutrition-examination-survey-1999-2004-from-bioimpedance-spectroscopy-data
#12
Adam J Kuchnia, Levi M Teigen, Abigail J Cole, Urvashi Mulasi, M Cristina Gonzalez, Steven B Heymsfield, David M Vock, Carrie P Earthman
BACKGROUND: Raw bioimpedance parameters (eg, 50-kHz phase angle [PA] and 200-kHz/5-kHz impedance ratio [IR]) have been investigated as predictors of nutrition status and/or clinical outcomes. However, their validity as prognostic measures depends on the availability of appropriate reference data. Using a large and ethnically diverse data set, we aimed to determine if ethnicity influences these measures and provide expanded bioimpedance reference data for the U.S. POPULATION: HASH(0x3833eb0) METHODS: The National Health and Nutrition Examination Survey (NHANES) is an ongoing compilation of studies conducted by the U...
September 26, 2016: JPEN. Journal of Parenteral and Enteral Nutrition
https://www.readbyqxmd.com/read/27669193/validity-of-selected-bioimpedance-equations-for-estimating-body-composition-in-men-and-women-a-four-compartment-model-comparison
#13
Brett S Nickerson, Michael R Esco, Phillip A Bishop, Randall Schumacker, Mark Richardson, Michael V Fedewa, Jonathan E Wingo, Bailey A Welborn
The purpose of this study was to compare body fat percentage (BF%) and fat-free mass (FFM) values from bioelectrical impedance analysis (BIA) equations to values determined from a four-compartment (4C) model. Eighty-two adults (42 men and 40 women) volunteered to participate (age = 23 ± 5 years). BF% and FFM were estimated from previously developed BIA equations by Chumlea et al. (BIACH), Deurenberg et al. (BIADE), Kyle et al. (BIAKYLE), and Sun et al. (BIASUN). 4C model body composition was derived from underwater weighing for body density, dual energy X-ray absorptiometry for bone mineral content, and bioimpedance spectroscopy for total body water...
September 20, 2016: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/27666944/validating-body-fat-assessment-by-bioelectric-impedance-spectroscopy-in-taiwanese-hemodialysis-patients
#14
Paik Seong Lim, Chang Hsu Chen, Fansan Zhu, Peter Kotanko, Yachung Jeng, Chun Yu Hu, Li Shu Chiu, Hui-Chen Chang
OBJECTIVE: Obesity is becoming increasingly common in hemodialysis (HD) patients and is associated with inflammation and increased mortality. The primary aim of the present study was to evaluate the accuracy and variability of the bioimpedance device in measuring body fat in Taiwanese dialysis patients. DESIGN: Cross-sectional study. SUBJECTS: One hundred twenty-two adult patients receiving HD in a single hospital in Taiwan. SETTING: We compared the results of fat mass (FM) measured by dual-energy x-ray absorptiometry (DEXA) and bioelectrical impedance spectroscopy device (Body composition monitor, BCM)...
September 22, 2016: Journal of Renal Nutrition
https://www.readbyqxmd.com/read/27647998/overhydration-negatively-affects-quality-of-life-in-peritoneal-dialysis-patients-evidence-from-a-prospective-observational-study
#15
Hye Eun Yoon, Young Joo Kwon, Ho Cheol Song, Jin Kuk Kim, Young Rim Song, Seok Joon Shin, Hyung Wook Kim, Chang Hwa Lee, Tae Won Lee, Young Ok Kim, Byung Soo Kim, Kyoung Hyoub Moon, Yoon Kyung Chang, Seong Suk Kim, Kitae Bang, Jong Tae Cho, Sung Ro Yun, Ki Ryang Na, Yang Wook Kim, Byoung Geun Han, Jong Hoon Chung, Kwang Young Lee, Jong Hyeok Jeong, Eun Ah Hwang, Yong-Soo Kim
UNLABELLED: Backgound: This study evaluated whether the hydration status affected health-related quality of life (HRQOL) during 12 months in peritoneal dialysis (PD) patients. METHODS: The hydration status and the HRQOL were examined at baseline and after 12 months using a bioimpedance spectroscopy and Kidney Disease Quality of Life-Short Form, respectively in PD patients. Four hundred eighty-one patients were included and divided according to the baseline overhydration (OH) value; normohydration group (NH group, -2L≤ OH ≤+2L, n=266) and overhydration group (OH group, OH >+2L, n=215)...
2016: International Journal of Medical Sciences
https://www.readbyqxmd.com/read/27630580/recognition-of-fibrotic-infarct-density-by-the-pattern-of-local-systolic-diastolic-myocardial-electrical-impedance
#16
Gerard Amorós-Figueras, Esther Jorge, Tomás García-Sánchez, Ramón Bragós, Javier Rosell-Ferrer, Juan Cinca
Myocardial electrical impedance is a biophysical property of the heart that is influenced by the intrinsic structural characteristics of the tissue. Therefore, the structural derangements elicited in a chronic myocardial infarction should cause specific changes in the local systolic-diastolic myocardial impedance, but this is not known. This study aimed to characterize the local changes of systolic-diastolic myocardial impedance in a healed myocardial infarction model. Six pigs were successfully submitted to 150 min of left anterior descending (LAD) coronary artery occlusion followed by reperfusion...
2016: Frontiers in Physiology
https://www.readbyqxmd.com/read/27620902/application-of-bioimpedance-spectroscopy-in-asian-dialysis-patients-abisad-iii-a-randomized-controlled-trial-for-clinical-outcomes
#17
Chen Huan-Sheng, Chang Yeong-Chang, Hsieh Ming-Hsing, Tseng Fan-Lieh, Lin Chu-Cheng, Wu Tsai-Kun, Chen Hung-Ping, Hung Sze-Hung, Chiu Hsien-Chang, Lee Chia-Chen, Hou Chun-Cheng, Cheng Chun-Ting, Liou Hung-Hsiang, Lin Chun-Ju, Lim Paik-Seong
PURPOSE: Fluid management with body composition monitor based on bioimpedance spectroscopy (BCM-BIS) has been found to be beneficial for dialysis patients. We conducted a study to provide an algorithm for the determination of post-dialysis target weight (PDTW) and to evaluate whether this approach could improve clinical outcomes compared to patients who had PDTW decided clinically. METHODS: Two hundred and ninety-eight dialysis patients participated in this 1-year randomized controlled trial...
November 2016: International Urology and Nephrology
https://www.readbyqxmd.com/read/27609856/investigating-the-effects-of-6%C3%A2-months-extended-duration-in-centre-nocturnal-versus-conventional-haemodialysis-treatment-a-non-randomised-controlled-feasibility-study
#18
Darren R Churchward, Matthew P M Graham-Brown, Robert Preston, Warren Pickering, Gerry P McCann, James O Burton
INTRODUCTION: In-centre nocturnal haemodialysis (INHD) is an underutilised dialysis regimen that can potentially provide patients with better clinical outcomes due to extended treatment times. We have established an INHD programme within our clinical network, fulfilling a previously unmet patient need. This feasibility study aims to gather sufficient data on numerous outcome measures to inform the design of a multicentre randomised controlled trial that will establish the potential benefits of INHD and increase the availability of this service nationally and internationally...
2016: BMJ Open
https://www.readbyqxmd.com/read/27604216/electrical-cell-substrate-impedance-spectroscopy-can-monitor-age-grouped-human-adipose-stem-cell-variability-during-osteogenic-differentiation
#19
Rachel C Nordberg, Jianlei Zhang, Emily H Griffith, Matthew W Frank, Binil Starly, Elizabeth G Loboa
: : Human adipose stem cells (hASCs) are an attractive cell source for bone tissue engineering applications. However, a critical issue to be addressed before widespread hASC clinical translation is the dramatic variability in proliferative capacity and osteogenic potential among hASCs isolated from different donors. The goal of this study was to test our hypothesis that electrical cell-substrate impedance spectroscopy (ECIS) could track complex bioimpedance patterns of hASCs throughout proliferation and osteogenic differentiation to better understand and predict variability among hASC populations...
September 7, 2016: Stem Cells Translational Medicine
https://www.readbyqxmd.com/read/27591138/noninvasive-assessment-of-an-engineered-bioactive-graft-in-myocardial-infarction-impact-on-cardiac-function-and-scar-healing
#20
Carolina Gálvez-Montón, Ramon Bragós, Carolina Soler-Boti Ja, Idoia Díaz-Güemes, Cristina Prat-Vidal, Verónica Crisóstomo, Francisco M Sánchez-Margallo, Aida Llucià-Valldeperas, Paco Bogónez-Franco, Isaac Perea-Gil, Santiago Roura, Antoni Bayes-Genis
: : Cardiac tissue engineering, which combines cells and biomaterials, is promising for limiting the sequelae of myocardial infarction (MI). We assessed myocardial function and scar evolution after implanting an engineered bioactive impedance graft (EBIG) in a swine MI model. The EBIG comprises a scaffold of decellularized human pericardium, green fluorescent protein-labeled porcine adipose tissue-derived progenitor cells (pATPCs), and a customized-design electrical impedance spectroscopy (EIS) monitoring system...
September 2, 2016: Stem Cells Translational Medicine
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