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"Phase angle"

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https://www.readbyqxmd.com/read/27875280/malnutrition-identified-by-the-academy-of-nutrition-and-dietetics-and-american-society-for-parenteral-and-enteral-nutrition-consensus-criteria-and-other-bedside-tools-is-highly-prevalent-in-a-sample-of-individuals-undergoing-treatment-for-head-and-neck-cancer
#1
Urvashi Mulasi, David M Vock, Adam J Kuchnia, Gautam Jha, Naomi Fujioka, Venkatesh Rudrapatna, Manish R Patel, Levi Teigen, Carrie P Earthman
BACKGROUND: Using the Academy of Nutrition and Dietetics and American Society for Parenteral and Enteral Nutrition (Academy/ASPEN) Consensus malnutrition definition, we estimated malnutrition prevalence in a sample of individuals with head and neck cancer (HNC) and compared it with the Patient-Generated Subjective Global Assessment (PG-SGA). We also investigated the utility of the 50-kHz phase angle (PA) and 200-kHz/5-kHz impedance ratio (IR) to identify malnutrition. MATERIALS AND METHODS: Nineteen individuals (18 males, 1 female) scheduled to undergo chemoradiotherapy were seen at 5 time points during and up to 3 months after treatment completion...
October 7, 2016: JPEN. Journal of Parenteral and Enteral Nutrition
https://www.readbyqxmd.com/read/27846267/interaction-between-the-stress-phase-angle-spa-and-the-oscillatory-shear-index-osi-affects-endothelial-cell-gene-expression
#2
Ronny Amaya, Limary M Cancel, John M Tarbell
Hemodynamic forces play an important role in the non-uniform distribution of atherosclerotic lesions. Endothelial cells are exposed simultaneously to fluid wall shear stress (WSS) and solid circumferential stress (CS). Due to variations in impedance (global factors) and geometric complexities (local factors) in the arterial circulation a time lag arises between these two forces that can be characterized by the temporal phase angle between CS and WSS (stress phase angle-SPA). Asynchronous flows (SPA close to -180°) that are most prominent in coronary arteries have been associated with localization of atherosclerosis...
2016: PloS One
https://www.readbyqxmd.com/read/27828487/joint-tracking-and-equalization-scheme-for-multi-polarization-effects-in-coherent-optical-communication-systems
#3
Yiqiao Feng, Linqian Li, Jiachuan Lin, Hengying Xu, Wenbo Zhang, Xianfeng Tang, Lixia Xi, Xiaoguang Zhang
We propose a joint multi-polarization-effect tracking and equalization method based on two extended Kalman filters, which can cope with state of polarization (SOP) tracing, polarization demultiplexing, equalization for polarization dependent loss (PDL) and polarization mode dispersion (PMD) in PDM-M-QAM coherent optical communication system. The mathematical model of the proposed method is given and analyzed in detail. Through simulation, the proposed method is proved to be very effective in a 28 Gbaud/s PDM-16QAM system...
October 31, 2016: Optics Express
https://www.readbyqxmd.com/read/27826005/comparative-evaluation-of-polycyanoacrylates
#4
Yoav Barkan, Mira Levinman, Ilana Veprinsky-Zuzuliya, Tsadok Tsach, Emmanuelle Merqioul, Galia Blum, Abraham J Domb, Arijit Basu
: Cyanoacrylate esters (CA) and their corresponding polymers (PolyCA) are used as general and medical adhesives, biodegradable carriers for controlled drug delivery, and as agents for fingerprint development in forensic science. Most reports of cyanoacrylate are on ethyl or 2-octyl cyanoacrylate ester with little attention to other esters. It is the objective of this study to determine the differences amongst cyanoacrylate esters regarding their synthesis, chemical characterization, hydrolytic degradation, and thermal and mechanical properties...
November 4, 2016: Acta Biomaterialia
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/27812851/pineal-volume-and-evening-melatonin-in-young-people-with-affective-disorders
#6
Joanne S Carpenter, Amy C Abelmann, Sean N Hatton, Rébecca Robillard, Daniel F Hermens, Maxwell R Bennett, Jim Lagopoulos, Ian B Hickie
Affective disorders in young people have been associated with disruptions in circadian rhythms, including abnormalities in secretion of the pineal hormone melatonin. Previous research reports relationships between pineal gland volumes, melatonin secretion, and sleep-wake cycles, but the relationship between these factors has not been explored in affective disorders. This study aimed to characterize these factors and explore associations with mood symptoms and functioning in a sample of young people with affective disorders...
November 3, 2016: Brain Imaging and Behavior
https://www.readbyqxmd.com/read/27803765/nutritional-evaluation-in-cirrhosis-emphasis-on-the-phase-angle
#7
REVIEW
Sabrina Alves Fernandes, Angelo Alves de Mattos, Cristiane Valle Tovo, Claudio Augusto Marroni
Protein-calorie malnutrition (PCM) is a common condition in cirrhotic patients, leading to a worse prognosis, complications, poor quality of life and lower survival rates. Among ways of assessing nutritional status, there are anthropometric methods such as the evaluation of the triceps skinfold, the arm circumference, the arm muscle circumference and the body mass index, and non-anthropometric methods such as the subjective global assessment, the handgrip strength of non-dominant hand, and the bioelectrical impedance analysis (BIA)...
October 18, 2016: World Journal of Hepatology
https://www.readbyqxmd.com/read/27803609/bioelectrical-impedance-phase-angle-as-a-prognostic-indicator-of-survival-in-head-and-neck-cancer
#8
M S Władysiuk, R Mlak, K Morshed, W Surtel, A Brzozowska, T Małecka-Massalska
BACKGROUND: Phase angle could be an alternative to subjective global assessment for the assessment of nutrition status in patients with head-and-neck cancer. METHODS: We prospectively evaluated a cohort of 75 stage iiib and iv head-and-neck patients treated at the Otolaryngology Department, Head and Neck Surgery, Medical University of Lublin, Poland. Bioelectrical impedance analysis was performed in all patients using an analyzer that operated at 50 kHz. The phase angle was calculated as reactance divided by resistance (Xc/R) and expressed in degrees...
October 2016: Current Oncology
https://www.readbyqxmd.com/read/27796163/bioimpedance-derived-phase-angle-and-mortality-among-older-people
#9
Laurence Genton, Kristina Norman, Adrian Spoerri, Claude Pichard, Véronique L Karsegard, François R Herrmann, Christophe E Graf
BACKGROUND: Phase angle measured by bioelectrical impedance analysis (BIA) may be a marker of health state. OBJECTIVE: This historical cohort study of prospectively collected BIA measurements aims to investigate the link between phase angle and mortality in older people and evaluate whether a phase angle cutoff can be defined. DESIGN: We included all adults aged ≥65 years who underwent a BIA measurement by the Nutriguard(®) device at the Geneva University Hospitals...
December 2, 2016: Rejuvenation Research
https://www.readbyqxmd.com/read/27795550/circadian-timing-and-alignment-in-healthy-adults-associations-with-bmi-body-fat-caloric-intake-and-physical-activity
#10
K G Baron, K J Reid, T Kim, L Van Horn, H Attarian, L Wolfe, J Siddique, G Santostasi, P C Zee
INTRODUCTION: Disruption of circadian rhythms is one of the proposed mechanisms linking late sleep timing to obesity risk but few studies have evaluated biological markers outside of the laboratory. The goal of this study was to determine the relationship between the timing and alignment of melatonin and sleep onset (phase angle) with BMI, body fat and obesity related behaviors. We hypothesized that circadian alignment (relationship of melatonin to sleep timing) rather than circadian (melatonin) timing would be associated with higher BMI, body fat, dietary intake and lower physical activity...
October 31, 2016: International Journal of Obesity: Journal of the International Association for the Study of Obesity
https://www.readbyqxmd.com/read/27793064/hypertrophy-type-resistance-training-improves-phase-angle-in-young-adult-men-and-women
#11
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/27780765/influence-of-strain-on-the-corrosion-of-magnesium-alloys-and-zinc-in-physiological-environments
#12
Karin Törne, Andreas Örnberg, Jonas Weissenrieder
: During implantation load-bearing devices experience stress that may influence its mechanical and corrosion profile and potentially lead to premature rupture. The susceptibility to stress corrosion cracking (SCC) of the Mg-Al alloy AZ61 and Zn was studied in simulated body fluid (m-SBF) and whole blood by slow strain rate (SSR) testing in combination with electrochemical impedance spectroscopy (EIS) and further ex-situ analysis including scanning electron microscopy (SEM) and Fourier transform infrared spectroscopy...
October 22, 2016: Acta Biomaterialia
https://www.readbyqxmd.com/read/27774782/reference-independent-wide-field%C3%A2-fluorescence-lifetime-measurements-using-frequency-domain-fd-technique-based-on-phase-and-amplitude-crossing-point
#13
Gilad Yahav, Eran Barnoy, Nir Roth, Lior Turgeman, Dror Fixler
Fluorescence lifetime imaging microscopy (FLIM) is an essential tool in many scientific fields such as biology and medicine thanks to the known advantages of the fluorescence lifetime (FLT) over the classical fluorescence intensity (FI). However, the frequency domain (FD) FLIM technique suffers from its strong dependence on the reference and its compliance to the sample. In this paper, we suggest a new way to calculate the FLT by using the crossing point (CRPO) between the modulation and phase FLTs measured over several light emitting diode (LED) DC currents values instead of either method alone...
October 24, 2016: Journal of Biophotonics
https://www.readbyqxmd.com/read/27761535/detection-of-an-explosive-simulant-via-electrical-impedance-spectroscopy-utilizing-the-uio-66-nh2-metal-organic-framework
#14
G W Peterson, M McEntee, C R Harris, A D Klevitch, A W Fountain, J R Soliz, A Balboa, A J Hauser
Electrical impedance spectroscopy, in conjunction with the metal-organic framework (MOF) UiO-66-NH2, is used to detect trace levels of the explosive simulant 2,6-dinitrotoluene. The combination of porosity and functionality of the MOF provides an effective dielectric structure, resulting in changes of impedance magnitude and phase angle. The promising data indicate that MOFs may be used in low-cost, robust explosive detection devices.
October 20, 2016: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/27754086/os-19-09-bioelectrical-impedance-phase-angle-as-intradialytic-hypotension-predictor
#15
Vaidas Vicka, Laurynas Rimsevicius, Alvita Gincaite, Diana Sukackiene, Marius Miglinas
OBJECTIVE: Water balance and blood pressure (BP) alterations are strongly associated in haemodialysis (HD) patients. Aim of this study was to determine whether bioelectrical impedance analysis (BIA) parameters can be used as predictors of intradialytic hypotension (IDH). DESIGN AND METHOD: We conducted an observational study of chronic HD patients. BIA was measured before the HD procedure using InBody S10 (Biospace, Seoul, Korea) body composition analyzer. Intracellular water (ICW), extracellular water (ECW), total body water (TBW), ECW/TBW ratio and phase angle (PhA) were selected as markers of hydration state and thus possible predictors of IDH...
September 2016: Journal of Hypertension
https://www.readbyqxmd.com/read/27716248/instantaneous-phase-difference-analysis-between-thoracic-and-abdominal-movement-signals-based-on-complementary-ensemble-empirical-mode-decomposition
#16
Ya-Chen Chen, Tzu-Chien Hsiao
BACKGROUND: Thoracoabdominal asynchrony is often adopted to discriminate respiratory diseases in clinics. Conventionally, Lissajous figure analysis is the most frequently used estimation of the phase difference in thoracoabdominal asynchrony. However, the temporal resolution of the produced results is low and the estimation error increases when the signals are not sinusoidal. Other previous studies have reported time-domain procedures with the use of band-pass filters for phase-angle estimation...
October 6, 2016: Biomedical Engineering Online
https://www.readbyqxmd.com/read/27709408/coupling-of-shear-circumferential-stress-pulses-investigation-through-stress-phase-angle-in-fsi-models-of-stenotic-artery-using-experimental-data
#17
Milad Samaee, Mohammad Tafazzoli-Shadpour, Hamed Alavi
Many cardiovascular diseases are closely associated with hemodynamic parameters. The main purpose of this study is mimicking a physiological blood flow in stenotic arteries to provide an understanding of hemodynamic parameters. An experimental setup was designed to produce original pulsatile flow and measure pressure pulse waves through a compliant tube. Moreover, a numerical model considering fluid-solid interaction was developed to investigate wall shear stress and circumferential stress waves, based on the results of the experiments...
October 5, 2016: Medical & Biological Engineering & Computing
https://www.readbyqxmd.com/read/27706455/food-consumption-of-cirrhotic-patients-comparison-with-the-nutritional-status-and-disease-staging
#18
Flavia Feijó Nunes, Lílian Bassani, Sabrina Alves Fernandes, Maria Eugênia Deutrich, Bianca Coccaro Pivatto, Cláudio Augusto Marroni
Background: Patients with liver disease often present protein-energy malnutrition. The assessment of food intake is very important in the investigation regarding the "health-disease" process. Objective: To assess dietary intake of cirrhotic patients through food record during 3 days, correlating it with the nutritional status of the patient and the stage of the disease. Methods: Cirrhotic outpatients from the Santa Casa de Misericórdia Hospital, RS, Brazil, were assessed...
October 2016: Arquivos de Gastroenterologia
https://www.readbyqxmd.com/read/27692279/factors-predisposing-to-worsening-of-sleep-apnea-in-response-to-fluid-overload-in-men
#19
Bojan Gavrilovic, T Douglas Bradley, Daniel Vena, Owen D Lyons, Joseph M Gabriel, Milos R Popovic, Azadeh Yadollahi
OBJECTIVES: Obstructive sleep apnea (OSA) is highly prevalent in patients with fluid-retaining conditions. Using bioimpedance measurements, previous studies have shown that the greater the amount of fluid redistributed from the legs to the neck overnight, the greater the severity of OSA. Our objective was to investigate factors that predispose the development or worsening of OSA in response to experimental fluid overload. METHODS: Fifteen normotensive and non-obese adult men with and without OSA underwent polysomnography (PSG) during which normal saline was infused intravenously at a minimal rate to keep the vein open (control) or as a bolus of 22 ml/kg body weight (approximately 2 L) in a random order and crossed over after a week...
July 2016: Sleep Medicine
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
#20
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(0x3b90900) 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
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