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Bioimpedence

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https://www.readbyqxmd.com/read/27933294/branched-chain-amino-acid-levels-are-related-with-surrogates-of-disturbed-lipid-metabolism-among-older-men
#1
Urho M Kujala, Markku Peltonen, Merja K Laine, Jaakko Kaprio, Olli J Heinonen, Jouko Sundvall, Johan G Eriksson, Antti Jula, Seppo Sarna, Heikki Kainulainen
AIMS/HYPOTHESIS: Existing studies suggest that decreased branched-chain amino acid (BCAA) catabolism and thus elevated levels in blood are associated with metabolic disturbances. Based on such information, we have developed a hypothesis how BCAA degradation mechanistically connects to tricarboxylic acid cycle, intramyocellular lipid storage, and oxidation, thus allowing more efficient mitochondrial energy production from lipids as well as providing better metabolic health. We analyzed whether data from aged Finnish men are in line with our mechanistic hypothesis linking BCAA catabolism and metabolic disturbances...
2016: Frontiers in Medicine
https://www.readbyqxmd.com/read/27932937/effect-of-electrolyzed-high-ph-alkaline-water-on-blood-viscosity-in-healthy-adults
#2
Joseph Weidman, Ralph E Holsworth, Bradley Brossman, Daniel J Cho, John St Cyr, Gregory Fridman
BACKGROUND: Previous research has shown fluid replacement beverages ingested after exercise can affect hydration biomarkers. No specific hydration marker is universally accepted as an ideal rehydration parameter following strenuous exercise. Currently, changes in body mass are used as a parameter during post-exercise hydration. Additional parameters are needed to fully appreciate and better understand rehydration following strenuous exercise. This randomized, double-blind, parallel-arm trial assessed the effect of high-pH water on four biomarkers after exercise-induced dehydration...
2016: Journal of the International Society of Sports Nutrition
https://www.readbyqxmd.com/read/27928711/dry-weight-assessment-by-combined-ultrasound-and-bioimpedance-monitoring-in-low-cardiovascular-risk-hemodialysis-patients-a-randomized-controlled-trial
#3
Dimitrie Siriopol, Mihai Onofriescu, Luminita Voroneanu, Mugurel Apetrii, Ionut Nistor, Simona Hogas, Mehmet Kanbay, Radu Sascau, Dragos Scripcariu, Adrian Covic
PURPOSE: Fluid overload is associated with adverse outcomes in hemodialysis (HD) patients. The precise assessment of hydration status in HD patients remains a major challenge for nephrologists. Our study aimed to explore whether combining two bedside methods, lung ultrasonography (LUS) and bioimpedance, may provide complementary information to guide treatment in specific HD patients. METHODS: In total, 250 HD patients from two dialysis units were included in this randomized clinical trial...
December 7, 2016: International Urology and Nephrology
https://www.readbyqxmd.com/read/27925328/screening-for-preeclampsia-in-the-first-trimester-the-usefulness-of-maternal-hemodynamics-and-bioimpedence-in-non-obese-patients
#4
Giulia Gagliardi, Grazia Maria Tiralongo, Damiano Lo Presti, Ilaria Pisani, Daniele Farsetti, Barbara Vasapollo, Gian Paolo Novelli, Angela Andreoli, Herbert Valensise
OBJECTIVE: To test if maternal hemodynamics, and bioimpedance, together with the Combined Screening (maternal history, biophysical and biochemical markers), are able to identify normotensive non-obese patients at risk for preeclampsia (PE) and/or intrauterine growth restriction (IUGR) in the first trimester of gestation. METHODS: 150 healthy nulliparous non-obese women (BMI<30Kg/m(2) ) were enrolled in the study in the first trimester of pregnancy and submitted to USCOM to detect hemodynamic parameters, bioimpedence to characterize body composition, and combined screening for preeclampsia (maternal history, biophysical and maternal biochemical markers)...
December 7, 2016: Ultrasound in Obstetrics & Gynecology
https://www.readbyqxmd.com/read/27898004/reconfigurable-multiparameter-biosignal-acquisition-soc-for-low-power-wearable-platform
#5
Jongpal Kim, Hyoungho Ko
A low power and low noise reconfigurable analog front-end (AFE) system on a chip (SoC) for biosignal acquisition is presented. The presented AFE can be reconfigured for use in electropotential, bioimpedance, electrochemical, and photoelectrical modes. The advanced healthcare services based on multiparameter physiological biosignals can be easily implemented with these multimodal and highly reconfigurable features of the proposed system. The reconfigurable gain and input referred noise of the core instrumentation amplifier block are 25 dB to 52 dB, and 1 μVRMS, respectively...
November 25, 2016: Sensors
https://www.readbyqxmd.com/read/27894750/risk-factors-for-autonomic-and-somatic-nerve-dysfunction-in-different-stages-of-glucose-tolerance
#6
Rumyana Dimova, Tsvetalina Tankova, Velina Guergueltcheva, Ivailo Tournev, Nevena Chakarova, Greta Grozeva, Lilia Dakovska
AIM: The present study evaluates autonomic and somatic nerve function in different stages of glucose tolerance and its correlation with different cardio-metabolic parameters. MATERIAL AND METHODS: Four hundred seventy-eight subjects, mean age 49.3±13.7years and mean BMI 31.0±6.2kg/m2, divided according to glucose tolerance: 130 with normal glucose tolerance (NGT), 227 with prediabetes (125 with impaired fasting glucose (IFG) and 102 with isolated impaired glucose tolerance (iIGT)), and 121 with newly-diagnosed T2D (NDT2D), were enrolled...
November 6, 2016: Journal of Diabetes and its Complications
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
#7
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/27866037/preoperative-preparation-of-a-patient-with-grade-ii-leg-lymphedema-for-his-third-hip-replacement-surgery
#8
Maria de Fátima Guerreiro Godoy, Livia Maria Pereira de Godoy, Renata Lopes Pinto, Jose Maria Pereira de Godoy
INTRODUCTION: The treatment of lymphedema remains a challenge to modern medicine, due to the characteristics of the disease. CASE PRESENTATION: Report on the case of a 75-year-old patient with lower limb lymphedema for treatment prior to surgery. At age 45, he made the first hip replacement surgery in the left leg. One year later he performed the same surgery on the right leg. At that time his legs had slight ankle edema mainly of the left leg and the entire left leg was affected by lymphedema...
September 28, 2016: International Journal of Surgery Case Reports
https://www.readbyqxmd.com/read/27861264/use-of-b-mode-ultrasound-as-a-body-fat-estimate-in-collegiate-football-players
#9
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/27860119/bioimpedance-monitoring-of-cellular-hydration-during-hemodialysis-therapy
#10
Leslie D Montgomery, Richard W Montgomery, Wayne A Gerth, Susie Q Lew, Michael D Klein, Julian M Stewart, Marvin S Medow, Manuel T Velasquez
Introduction The aim of this paper is to describe and demonstrate how a new bioimpedance analytical procedure can be used to monitor cellular hydration of End Stage Renal Disease (ESRD) patients during hemodialysis (HD). Methods A tetra-polar bioimpedance spectroscope (BIS), (UFI Inc., Morro Bay, CA), was used to measure the tissue resistance and reactance of the calf of 17 ESRD patients at 40 discrete frequencies once a minute during dialysis treatment. These measurements were then used to derive intracellular, interstitial, and intravascular compartment volume changes during dialysis...
November 8, 2016: Hemodialysis International
https://www.readbyqxmd.com/read/27834282/the-use-of-technology-for-estimating-body-composition-strengths-and-weaknesses-of-common-modalities-in-a-clinical-setting
#11
Levi M Teigen, Adam J Kuchnia, Marina Mourtzakis, Carrie P Earthman
Assessment of body composition, both at single time points and longitudinally, is particularly important in clinical nutrition practice. It provides a means for the clinician to characterize nutrition status at a single time point, aiding in the identification and diagnosis of malnutrition, and to monitor changes over time by providing real-time information on the adequacy of nutrition interventions. Objective body composition measurement tools are available clinically but are often underused in nutrition care, particularly in the United States...
November 9, 2016: Nutrition in Clinical Practice
https://www.readbyqxmd.com/read/27832647/extracellular-volume-overload-and-increased-vasoconstriction-in-patients-with-recurrent-intradialytic-hypertension
#12
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
#13
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/27827911/changes-in-body-composition-in-the-two-years-after-initiation-of-haemodialysis-a-retrospective-cohort-study
#14
David Keane, Claire Gardiner, Elizabeth Lindley, Simon Lines, Graham Woodrow, Mark Wright
Malnutrition is common in haemodialysis (HD) and is linked to poor outcomes. This study aimed to describe changes in body composition after the initiation of HD and investigate whether any routinely collected parameters were associated with these changes. The study cohort came from the HD population of a single centre between 2009 and 2014. Body composition measurements were obtained from a database of bioimpedance results using the Body Composition Monitor (BCM), while demographics and laboratory values came from the renal unit database...
November 4, 2016: Nutrients
https://www.readbyqxmd.com/read/27822564/design-of-a-randomized-controlled-clinical-trial-assessing-dietary-sodium-restriction-and-hemodialysis-related-symptom-profiles
#15
Maya N Clark-Cutaia, Marilyn S Sommers, Emily Anderson, Raymond R Townsend
AIM: In hemodialysis patients, the need to have intercurrent sodium and water intake removed by ultrafiltration increases disease burden through the symptoms and signs that occur during hemodialysis (HD). This added burden may be mitigated by reduction of dietary sodium intake. The National Kidney Foundation (NKF) recommends 2400 mg of dietary sodium daily for patients on HD, and the American Heart Association (AHA) suggests 1500 mg, evidence is lacking, however, to support these recommendations in HD...
August 15, 2016: Contemporary Clinical Trials Communications
https://www.readbyqxmd.com/read/27821919/bioelectrical-impedance-analysis-for-severe-stroke-patients-with-upper-extremity-hemiplegia
#16
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/27812921/electrical-impedance-myography-and-its-applications-in-neuromuscular-disorders
#17
REVIEW
Benjamin Sanchez, Seward B Rutkove
Electrical impedance myography (EIM) refers to the specific application of electrical bioimpedance techniques for the assessment of neuromuscular disorders. In EIM, a weak, high-frequency electrical current is applied to a muscle or muscle group of interest and the resulting voltages measured. Among its advantages, the technique can be used noninvasively across a variety of disorders and requires limited subject cooperation and evaluator training to obtain accurate and repeatable data. Studies in both animals and human subjects support its potential utility as a primary diagnostic tool, as well as a biomarker for clinical trial or individual patient use...
November 3, 2016: Neurotherapeutics: the Journal of the American Society for Experimental NeuroTherapeutics
https://www.readbyqxmd.com/read/27811407/improved-electrode-positions-for-local-impedance-measurements-in-the-lung-a-simulation-study
#18
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
#19
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/27802703/an-improved-device-for-bioimpedance-deviation-measurements-based-on-4-electrode-half-bridge
#20
Yang Liu, Xiaoyan Qiao, Gang Li, Ling Lin
Researches on monitoring the body fluid changes have attracted much attention during recent years. Real-time bioimpedance deviation detection has good potential for evaluating body fluid changes. In this paper, an improved device based on the self-balancing half bridge and the 4-electrode technique is proposed, which is able to detect minor bioimpedance deviations. The 4-electrode technique is used to remove the interference from contact impedance. Furthermore, the automatic balancing half bridge is utilized to deduct the high-level static impedance baseline, and thus, the dynamic range is enlarged...
October 2016: Review of Scientific Instruments
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