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"Phase angle"

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https://www.readbyqxmd.com/read/29786894/the-prognostic-role-of-phase-angle-in-advanced-cancer-patients-a-systematic-review
#1
REVIEW
Mayane Marinho Esteves Pereira, Mariana Dos Santos Campello Queiroz, Nathália Masiero Cavalcanti de Albuquerque, Juliana Rodrigues, Emanuelly Varea Maria Wiegert, Larissa Calixto-Lima, Livia Costa de Oliveira
Phase angle (PA) is a ratio between the reactance and resistance obtained by bioelectric impedance analysis and has been interpreted as a cell membrane integrity indicator and a predictor of total body cell mass. A low PA may suggest deterioration of the cell membrane, which in advanced cancer patients may result in a reduced overall survival (OS). This systematic review sought to investigate the current evidence regarding whether there is an association between PA and OS in patients with advanced cancer (ie, metastatic disease)...
May 22, 2018: Nutrition in Clinical Practice
https://www.readbyqxmd.com/read/29785538/stress-phase-angle-regulates-differentiation-of-human-adipose-derived-stem-cells-toward-endothelial-phenotype
#2
Shahrokh Shojaei, Mohammad Tafazzoli-Shadpour, Mohammad Ali Shokrgozar, Nooshin Haghighipour, Fatemeh Hejazi Jahromi
Endothelial cells are subjected to cyclic shear by pulsatile blood flow and pressures due to circumferential stresses. Although most of the researches on this topic have considered the effects of these two biomechanical forces separately or concurrently, few studies have noticed the interaction of these cyclic loadings on endothelial behavior. Negative temporal stress phase angle, defined by the phase lag between cyclic shear and tensile stresses, is an established parameter which is known to have substantial effects on blood vessel remodeling and progression of some serious cardiovascular diseases...
May 21, 2018: Progress in Biomaterials
https://www.readbyqxmd.com/read/29774618/direct-laser-writing-of-graphene-made-from-chemical-vapor-deposition-for-flexible-integratable-micro-supercapacitors-with-ultrahigh-power-output
#3
Jianglin Ye, Huabing Tan, Shuilin Wu, Kun Ni, Fei Pan, Jie Liu, Zhuchen Tao, Yan Qu, Hengxing Ji, Patrice Simon, Yanwu Zhu
High-performance yet flexible micro-supercapacitors (MSCs) hold great promise as miniaturized power sources for increasing demand of integrated electronic devices. Herein, this study demonstrates a scalable fabrication of multilayered graphene-based MSCs (MG-MSCs), by direct laser writing (DLW) of stacked graphene films made from industry-scale chemical vapor deposition (CVD). Combining the dry transfer of multilayered CVD graphene films, DLW allows a highly efficient fabrication of large-areal MSCs with exceptional flexibility, diverse planar geometry, and capability of customer-designed integration...
May 17, 2018: Advanced Materials
https://www.readbyqxmd.com/read/29761843/calf-circumference-a-marker-of-muscle-mass-as-a-predictor-of-hospital-readmission
#4
Gustavo Gonzales Real, Inara Regina Frühauf, José Henrique Koth Sedrez, Eduarda Jaine Fachinello Dall'Aqua, Maria Cristina Gonzalez
Hospital readmissions (HRs) are common, potentially preventable, and a marker of poor quality in health services. This study aimed to identify risk factors for HR in clinical patients, with an emphasis on nutrition aspects, especially calf circumference (CC), as a marker of muscle mass. A prospective cohort study of patients admitted to the internal medicine ward was conducted. The short form of the Patient-Generated Subjective Global Assessment was performed in the first 24 hours of hospitalization. In addition, single-frequency bioelectrical impedance analysis was used to estimate the phase angle, CC as a surrogate of muscle mass, and handgrip strength as a marker of strength...
May 15, 2018: JPEN. Journal of Parenteral and Enteral Nutrition
https://www.readbyqxmd.com/read/29748659/bioelectrical-impedance-analysis-derived-phase-angle-at-admission-as-a-predictor-of-90-day-mortality-in-intensive-care-patients
#5
Sandra N Stapel, Wilhelmus G P M Looijaard, Ingeborg M Dekker, Armand R J Girbes, Peter J M Weijs, Heleen M Oudemans-van Straaten
BACKGROUND/OBJECTIVES: A low bioelectrical impedance analysis (BIA)-derived phase angle (PA) predicts morbidity and mortality in different patient groups. An association between PA and long-term mortality in ICU patients has not been demonstrated before. The purpose of the present study was to determine whether PA on ICU admission independently predicts 90-day mortality. SUBJECTS/ METHODS: This prospective observational study was performed in a mixed university ICU...
May 11, 2018: European Journal of Clinical Nutrition
https://www.readbyqxmd.com/read/29733190/enhanced-piezoelectric-response-in-hybrid-lead-halide-perovskite-thin-films-via-interfacing-with-ferroelectric-pbzr0-2ti0-8o3
#6
Jingfeng Song, Zhiyong Xiao, Bo Chen, Spencer Prockish, Xuegang Chen, Anil Rajapitamahuni, Le Zhang, Jinsong Huang, Xia Hong
We report a more than 10-fold enhancement of the piezoelectric coefficient d33 of polycrystalline CH3NH3PbI3 (MAPbI3) films when interfacing them with ferroelectric PbZr0.2Ti0.8O3 (PZT). Piezo-response force microscopy (PFM) studies reveal d_33^(MAPbI_3 ) values of ~0.3 pm/V for MAPbI3 deposited on Au, ITO and SrTiO3 surfaces, with small phase angle fluctuating at length scales smaller than the grain size. In sharp contrast, on samples prepared on epitaxial PZT films, we observe large scale polar domains exhibiting clear, close to 180° PFM phase contrasts, pointing to polar axes along the film normal...
May 7, 2018: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29727499/learning-to-balance-on-a-slackline-development-of-coordinated-multi-joint-synergies
#7
Robyn L Mildren, Martin Zaback, Allan L Adkin, Leah R Bent, James S Frank
Previous research has investigated synergies involved in locomotion and balance reactions; however, there is limited insight into the emergence of skilled balance control with practice of challenging tasks. We explored motor learning of tandem and single leg stance on an unstable surface - a slackline. Balance was tested in 10 naïve healthy adults at four time points: baseline, after one slackline practice session, after one week of practice, and one week following the final practice session. We recorded kinematics of the upper and lower arms bilaterally, trunk, and thigh and foot unilaterally while participants balanced in tandem and single leg stance on a slackline and narrow rigid beam (transfer task)...
May 4, 2018: Scandinavian Journal of Medicine & Science in Sports
https://www.readbyqxmd.com/read/29727473/can-circadian-dysregulation-exacerbate-migraines
#8
REVIEW
Jason C Ong, Hannah L Taylor, Margaret Park, Helen J Burgess, Rina S Fox, Sarah Snyder, Jeanetta C Rains, Colin A Espie, James K Wyatt
OBJECTIVE: This observational pilot study examined objective circadian phase and sleep timing in chronic migraine (CM) and healthy controls (HC) and the impact of circadian factors on migraine frequency and severity. BACKGROUND: Sleep disturbance has been identified as a risk factor in the development and maintenance of CM but the biological mechanisms linking sleep and migraine remain largely theoretical. METHODS: Twenty women with CM and 20 age-matched HC completed a protocol that included a 7 day sleep assessment at home using wrist actigraphy followed by a circadian phase assessment using salivary melatonin...
May 4, 2018: Headache
https://www.readbyqxmd.com/read/29717760/relation-of-disease-with-standardized-phase-angle-among-older-patients
#9
C E Graf, F R Herrmann, L Genton
BACKGROUND: A low phase angle (PA) has been associated with negative outcome in specific diseases. However, many patients suffer from several co-morbidities. This study aims at identifying the impact of the type and the severity of diseases on PA in a retrospective cohort study of older people. METHODS: We included all people ≥65 years who underwent a PA measurement (Nutriguard®) between 1990 and 2011 at the Geneva University Hospitals. PA was standardized for gender, age and body mass index according to German reference values...
2018: Journal of Nutrition, Health & Aging
https://www.readbyqxmd.com/read/29708859/bioimpedance-patterns-and-bioelectrical-impedance-vector-analysis-biva-of-road-cyclists
#10
Andrea Giorgi, Maurizio Vicini, Luca Pollastri, Erica Lombardi, Emilio Magni, Andrea Andreazzoli, Marco Orsini, Marco Bonifazi, Henry Lukaski, Hannes Gatterer
Bioelectrical impedance vector-analysis (BIVA) describes cell-mass, cell function and hydration status of an individual or a group. The goal of the present investigation was to provide bioelectrical impedance data for 525 male road cyclists (155 professionals, 79 elite, 59 elite-youth, and 232 amateurs) at the time of their optimal performance level. Data were plotted on the resistance-reactance (R-Xc) graph to characterize cyclists group vectors using BIVA. Compared to the general male population, the mean vector position of the road cyclists indicates a higher body cell mass (BCM) and phase angle (p<0...
April 30, 2018: Journal of Sports Sciences
https://www.readbyqxmd.com/read/29695763/phase-angle-and-mortality-a-systematic-review
#11
REVIEW
Luíza M Garlini, Fernanda D Alves, Luciane B Ceretta, Ingrid S Perry, Gabriela C Souza, Nadine O Clausell
BACKGROUND/OBJECTIVES: The phase angle, expressed through bioelectrical impedance, has been studied as a prognostic marker in several health conditions. As this issue is still conflicting, the question whether this parameter correlates with mortality in the most diverse clinical situations remains. Therefore, this study aimed to evaluate the relationship between phase angle and mortality through a systematic review of the literature. SUBJECTS/METHODS: This research was conducted in electronic databases (Pubmed, Embase, Cochrane, Lilacs, Scielo, e Scopus), and included studies that had phase angle as a variable of interest and mortality/survival as an outcome...
April 26, 2018: European Journal of Clinical Nutrition
https://www.readbyqxmd.com/read/29694263/the-decrease-in-phase-angle-measured-by-bioelectrical-impedance-analysis-reflects-the-increased-locomotive-syndrome-risk-in-community-dwelling-people-the-yakumo-study
#12
Satoshi Tanaka, Kei Ando, Kazuyoshi Kobayashi, Tetsuro Hida, Taisuke Seki, Takashi Hamada, Kenyu Ito, Mikito Tsushima, Masayoshi Morozumi, Masaaki Machino, Kyotaro Ota, Naoki Ishiguro, Yukiharu Hasegawa, Shiro Imagama
OBJECTIVES: The locomotive syndrome (LS) risk test has recently been advocated for the evaluation of physical ability. Phase angle measurement by bioelectrical impedance analysis (BIA) is an indicator of cellular health and muscle mass. We aimed to investigate how muscle mass and phase angle are related to LS risk stage. METHODS: A prospective cohort study was conducted in 311 patients who were undergoing a health checkup. All participants performed the two-step test, stand-up test, and 25-question geriatric locomotive function scale components of the LS risk test...
April 25, 2018: Modern Rheumatology
https://www.readbyqxmd.com/read/29684926/changes-in-phase-angle-and-handgrip-strength-induced-by-suspension-training-in-older-women
#13
Francesco Campa, Analiza Mónica Silva, Stefania Toselli
This study aimed to present a suspension exercise training program suitable for older adults and to verify the effect of 12 weeks of training on handgrip strength (HS) and anthropometric and bioelectrical impedance parameters in older adults. Thirty older women (age 66.1±4.7 years, BMI 30.6±5.3 kg/m2 ) were randomly assigned to one of two groups: a training group (TG, n=15) or a control group (CG, n=15). The TG participated in a 12-week suspension training program, while the CG maintained their normal physical activity habits for the duration of the study...
April 23, 2018: International Journal of Sports Medicine
https://www.readbyqxmd.com/read/29673210/bioelectrical-impedance-phase-angle-as-an-indicator-of-malnutrition-in-hospitalized-children-with-diagnosed-inflammatory-bowel-diseases-a-case-control-study
#14
Paweł Więch, Mariusz Dąbrowski, Dariusz Bazaliński, Izabela Sałacińska, Bartosz Korczowski, Monika Binkowska-Bury
The phase angle (PhA) seems to be a reliable screening tool for the identification of malnutrition risk in hospitalized children with inflammatory bowel disease (IBD). The aim of the present study was to assess the body composition and nutritional status of hospitalized children and adolescents with IBD by using bioelectrical impedance analysis (BIA) with phase angle (PhA) calculation, which has not been evaluated in hospitalized children with IBD yet. A total of 59 children and adolescents aged 4&ndash;18 years, with IBD: 34 ulcerative colitis (UC) and 25 Crohn&rsquo;s disease (CD) were included in the study...
April 17, 2018: Nutrients
https://www.readbyqxmd.com/read/29667400/magnetically-characterized-molecular-lubrication-between-bio-functionalized-surfaces
#15
Xinghao Hu, Sri Ramulu Torati, Jonghwan Yoon, Byeonghwa Lim, Kunwoo Kim, CheolGi Kim
We demonstrate an efficient approach for quantifying frictional forces (sub-pN) at nano-bio interfaces by controlled magnetic forces, which is based on simultaneous measurements of critical frequencies for streptavidin-coupled magnetic particles. The maximum phase angle, being corresponded with the critical frequency, is formulated in terms of magnetic, frictional and viscous forces of the particles on DNA and SiO2 functionalized micromagnet arrays. The streptavidin/DNA interface shows lower friction as an enhanced lubrication than the streptavidin/SiO2 interface, which is indicated by the lower transition field of quasi-static motion, the larger ratio of dynamic particles, and also the higher velocity of the particles...
April 18, 2018: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29655777/body-composition-evaluated-by-body-mass-index-and-bioelectrical-impedance-vector-analysis-in-women-with-rheumatoid-arthritis
#16
Juan Antonio Pineda-Juárez, Mariel Lozada-Mellado, Midori Ogata-Medel, Andrea Hinojosa-Azaola, Cira Santillán-Díaz, Luis Llorente, Arturo Orea-Tejeda, Jorge Alcocer-Varela, Rolando Espinosa-Morales, Marco González-Contreras, Lilia Castillo-Martínez
BACKGROUND: Rheumatoid arthritis (RA) is a complex inflammatory disease that modifies body composition. Although body mass index (BMI) is one of the clinical nutrition tools widely used to assess indirectly nutritional status, it is not able to identify these body alterations. Bioelectrical Vector Analysis (BIVA) is an alternative method to assess hydration and body cell mass of patients with wasting conditions. OBJECTIVE: To investigate the differences in nutrition status according to BMI groups (normal, overweight and obesity) and BIVA classification (cachectic and non-cachectic) in women with RA...
February 12, 2018: Nutrition
https://www.readbyqxmd.com/read/29648545/enhancement-of-aerodynamic-performance-of-a-heaving-airfoil-using-synthetic-jet-based-active-flow-control
#17
Chenglei Wang, Hui Tang
In this study, we explore the use of synthetic jet (SJ) in manipulating the vortices around a rigid heaving airfoil, so as to enhance its aerodynamic performance. The airfoil heaves at two fixed pitching angles, with the Strouhal number, reduced frequency and Reynolds number chosen as St=0.3, k=0.25 and Re=100, respectively, all falling in the ranges for natural flyers. As such, the vortex force plays a dominant role in determining the airfoil's aerodynamic performance. A pair of in-phase SJs is implemented on the airfoil's upper and lower surfaces, operating with the same strength but in opposite directions...
April 12, 2018: Bioinspiration & Biomimetics
https://www.readbyqxmd.com/read/29625408/nutritional-intervention-in-head-and-neck-cancer-patients-during-chemo-radiotherapy
#18
Serena Della Valle, Silvia Colatruglio, Vanessa La Vela, Elena Tagliabue, Luigi Mariani, Cecilia Gavazzi
OBJECTIVE: Head and neck cancer patients experience unintentional weight loss and malnutrition at diagnosis, during oncologic treatment, and after the end of therapy because of reduction of eating ability. The aim of the present study was to assess nutrition intervention efficacy in maintaining basal nutritional conditions. METHODS: Head and neck cancer patient candidates for chemoradiotherapy and requiring enteral nutrition (EN) support through gastrostomy, according to international guidelines, were included in the study...
February 5, 2018: Nutrition
https://www.readbyqxmd.com/read/29623499/a-low-phase-angle-measured-with-bioelectrical-impedance-analysis-is-associated-with-osteoporosis-and-is-a-risk-factor-for-osteoporosis-in-community-dwelling-people-the-yakumo-study
#19
Satoshi Tanaka, Kei Ando, Kazuyoshi Kobayashi, Tetsuro Hida, Kenyu Ito, Mikito Tsushima, Masayoshi Morozumi, Masaaki Machino, Kyotaro Ota, Taisuke Seki, Naoki Ishiguro, Yukiharu Hasegawa, Shiro Imagama
Although the phase angle has been reported to be related to predictive factors and therapeutic effects in various diseases, its relation with osteoporosis is unclear. In our large prospective survey of community-dwelling people, a low phase angle was related with osteoporosis, and it could be a predictor of osteoporosis. PURPOSE: The phase angle measured with bioelectrical impedance analysis (BIA) is one of the clinically important impedance parameters, and it is a predictor of prognosis and mortality for several diseases...
April 5, 2018: Archives of Osteoporosis
https://www.readbyqxmd.com/read/29616959/assessment-of-phase-angle-by-bioelectric-impedance-analysis-and-its-association-with-length-of-hospital-stay-in-patients-with-pancreatic-cancer-undergoing-pancreaticoduodenectomy
#20
Dimitrios Karayiannis, Magdalini Sarantidou, Petros Katralis, Georgios Stylianidis, Serafim Klimopoulos
No abstract text is available yet for this article.
April 2018: Clinical Nutrition ESPEN
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