Bio-Impedance Analysis Measures in a Rural Latina Community

2014 ◽  
pp. 1-3
Author(s):  
Trina Aguirre ◽  
Ann Koehler ◽  
Susan Wilhelm
Keyword(s):  
Impedance Analysis

Characterizations of Synthetic 8mol% YSZ with Comparison to 3mol %YSZ for HT-SOFC

2020 ◽  
Vol 38 (4A) ◽  
pp. 491-500
Author(s):  
Abeer F. Al-Attar ◽  
Saad B. H. Farid ◽  
Fadhil A. Hashim
Keyword(s):  
Ionic Conductivity ◽  
Electrochemical Impedance ◽  
Structural Information ◽  
Impedance Analysis ◽  
High Energy ◽  
Yttria Stabilized Zirconia ◽  
X Ray Diffraction ◽  
Stabilized Zirconia ◽  
Powder Morphology ◽  
X Ray

In this work, Yttria (Y2O3) was successfully doped into tetragonal 3mol% yttria stabilized Zirconia (3YSZ) by high energy-mechanical milling to synthesize 8mol% yttria stabilized Zirconia (8YSZ) used as an electrolyte for high temperature solid oxide fuel cells (HT-SOFC). This work aims to evaluate the densification and ionic conductivity of the sintered electrolytes at 1650°C. The bulk density was measured according to ASTM C373-17. The powder morphology and the microstructure of the sintered electrolytes were analyzed via Field Emission Scanning Electron Microscopy (FESEM). The chemical analysis was obtained with Energy-dispersive X-ray spectroscopy (EDS). Also, X-ray diffraction (XRD) was used to obtain structural information of the starting materials and the sintered electrolytes. The ionic conductivity was obtained through electrochemical impedance spectroscopy (EIS) in the air as a function of temperatures at a frequency range of 100(mHz)-100(kHz). It is found that the 3YSZ has a higher density than the 8YSZ. The impedance analysis showed that the ionic conductivity of the prepared 8YSZ at 800°C is0.906 (S.cm) and it was 0.214(S.cm) of the 3YSZ. Besides, 8YSZ has a lower activation energy 0.774(eV) than that of the 3YSZ 0.901(eV). Thus, the prepared 8YSZ can be nominated as an electrolyte for the HT-SOFC.

Structure refinement and impedance analysis of Ba0.85Ca0.15Zr0.10Ti0.90O3 ceramics sintered in air and nitrogen

2019 ◽  
Vol 30 (23) ◽  
pp. 20673-20686
Author(s):  
Ku Noor Dhaniah Ku Muhsen ◽  
Rozana Aina Maulat Osman ◽  
Mohd Sobri Idris
Keyword(s):  
Structure Refinement ◽  
Impedance Analysis

scholarly journals Effect of position and exercise on measurement of muscle quantity and quality: towards a standardised pragmatic protocol for clinical practice

2021 ◽  
Vol 13 (1) ◽  
Author(s):  
Carly Welch ◽  
Zeinab Majid ◽  
Isabelle Andrews ◽  
Zaki Hassan-Smith ◽  
Vicky Kamwa ◽  
...  
Keyword(s):  
Clinical Practice ◽  
Skeletal Muscle Mass ◽  
Rectus Femoris ◽  
Bioelectrical Impedance ◽  
Impedance Analysis ◽  
Upper Body ◽  
Fat Percentage ◽  
Non Invasive ◽  
Vastus Intermedius ◽  
Total Body

Abstract Background Ultrasonography is an emerging non-invasive bedside tool for muscle quantity/quality assessment; Bioelectrical Impedance Analysis (BIA) is an alternative non-invasive bedside measure of body composition, recommended for evaluation of sarcopenia in clinical practice. We set out to assess impact of position and exercise upon measures towards protocol standardisation. Methods Healthy volunteers aged 18–35 were recruited. Bilateral Anterior Thigh Thickness (BATT; rectus femoris and vastus intermedius), BATT: Subcutaneous Ratio (BATT:SCR), and rectus femoris echogenicity were measured using ultrasound and BIA was performed; 1) lying with upper body at 45° (Reclined), 2) lying fully supine at 180o (Supine), 3) sat in a chair with upper body at 90o (Sitting), and 4) after exercise Reclined. Variability of Skeletal Muscle Mass (SMM) by two different equations from BIA (SMM-Janssen, SMM-Sergi), phase angle, fat percentage, and total body (TBW), extracellular (ECW), and intracellular water (ICW) were assessed. Results Forty-four participants (52% female; mean 25.7 years-old (SD 5.0)) were recruited. BATT increased from Reclined to Sitting (+ 1.45 cm, 1.27–1.63), and after exercise (+ 0.51, 0.29–0.73). Echogenicity reduced from Reclined to Sitting (− 2.1, − 3.9 – -0.26). SMM-Sergi declined from Reclined to Supine (− 0.65 kg, − 1.08 – − 0.23) and after exercise (− 0.70 kg, − 1.27 – -0.14). ECW increased from Reclined to Sitting (+ 1.19 L, 0.04–2.35). There were no other statistically significant changes. Conclusion Standardisation of protocols is especially important for assessment of muscle quantity by ultrasonography; BIA measurements may also vary dependent on the equations used. Where possible, participants should be rested prior to muscle ultrasonography and BIA, and flexion of the knees should be avoided.

scholarly journals Muscle quantity and function measurements are acceptable to older adults during and post- hospitalisation: results of a questionnaire-based study

2021 ◽  
Vol 21 (1) ◽  
Author(s):  
Carly Welch ◽  
Carolyn Greig ◽  
Tahir Masud ◽  
Thomas A. Jackson
Keyword(s):  
Older Adults ◽  
Gait Speed ◽  
Bacterial Infections ◽  
Handgrip Strength ◽  
General Medicine ◽  
Research Participation ◽  
Bioelectrical Impedance ◽  
Impedance Analysis ◽  
Queen Elizabeth Hospital ◽  
Elective Colorectal Surgery

Abstract Background To evaluate the acceptability of handgrip strength, gait speed, quadriceps ultrasound, and Bioelectrical Impedance Analysis (BIA) to older adults conducted during and following hospitalisation. Methods Questionnaire-based study conducted upon completion of prospective cohort study, with follow-up in either Queen Elizabeth Hospital Birmingham (QEHB), UK, or participant’s own home following recent admission to QEHB. Outcome measures were acceptability as defined by total multi-domain score for each test (maximum score 35), and by frailty status. Results Forty adults aged 70 years and older admitted for emergency abdominal surgery, elective colorectal surgery, or acute bacterial infections (general medicine) participated. Handgrip strength (median 33, IQR 30–35; p = 0.001), gait speed (median 32, IQR 30–35; p = 0.002), ultrasound quadriceps (median 33, IQR 31–35; p = 0.001), and BIA (median 33.5, IQR 31–35; p = 0.001) were considered highly acceptable. Participants responded positively that they enjoyed participating in these tests, and considered these tests of importance. There was no difference in scores between tests (p = 0.166). Individual total test scores did not differ between patients with and without frailty. Qualitative data are also presented on drivers for research participation. Conclusions Handgrip strength, gait speed, ultrasound quadriceps, and BIA are acceptable tests to older adults during and following hospitalisation. Our results may serve as standards when evaluating acceptability of other tests. Trial registration Prospectively registered February 2019: https://clinicaltrials.gov/ct2/show/NCT03858192

scholarly journals POS-129 BIOELECTRICAL IMPEDANCE ANALYSIS IN DETERMINING BODY COMPOSITION IN SRI LANKAN PATIENTS WITH LUPUS NEPHRITIS

2021 ◽  
Vol 6 (4) ◽  
pp. S52
Author(s):  
D. BASNAYAKE ◽  
A. Nayanamali ◽  
H. Amarathunga ◽  
N. Erandika ◽  
J. Pathiraja ◽  
...  
Keyword(s):  
Body Composition ◽  
Lupus Nephritis ◽  
Bioelectrical Impedance Analysis ◽  
Bioelectrical Impedance ◽  
Impedance Analysis ◽  
Sri Lankan

15 Use of Bioelectric Impedance Analysis in Burn Patients: A Pilot Study

2021 ◽  
Vol 42 (Supplement_1) ◽  
pp. S16-S16
Author(s):  
Ian F Hulsebos ◽  
Maxwell B Johnson ◽  
Leigh J Spera ◽  
Megan C Fobar ◽  
Zachary J Collier ◽  
...  
Keyword(s):  
Body Composition ◽  
High Risk ◽  
Phase Angle ◽  
Impedance Analysis ◽  
Inhalation Injury ◽  
Burn Patients ◽  
Bioelectric Impedance Analysis ◽  
High Risk Patients ◽  
Severity Of Injury ◽  
Risk Patients

Abstract Introduction Bioelectric Impedance Analysis (BIA) is a rapid, non-invasive, and inexpensive technology based on electrical conductivity. BIA assesses body composition, fluid shifts, and phase angle, an electrical force vector where smaller values suggest cellular injury. Our objective was to use BIA to longitudinally track the clinical status of burn patients. We hypothesized that BIA would detect progressive decreases in muscle mass throughout the patient’s hospital course and that low phase angle values would correlate with severity of injury. Methods A cohort study of 10 patients from January 1, 2020 to March 13, 2020 was performed at an ABA-verified burn center. Patient and burn characteristics and laboratory data were collected. BIA measurements were performed daily for the first 10 days of admission and then twice weekly until discharge. The primary outcome was to detect changes in body composition. The secondary objectives were to detect differences between low and high-risk patients in terms of water composition and phase angle. Patients with APACHE II > 15, measured at burn unit admission, were considered high risk for burn injury related morbidity and mortality. Results BIA detected a statistically significant negative correlation between time spent hospitalized and leg lean mass (LM) (r2=0.56, P< 0.0001), right arm LM (r2=0.52, P< 0.0001) and left leg LM (r2=0.57, P< 0.0001), and positive correlation between body fat mass (BFM) and time spent hospitalized (r2=0.50, P=0.0004). Water composition (volume of extracellular water (ECW) per total body water (TBW)) negatively correlated with low-risk patients: right arm (r2=0.51, P< 0.0001), left arm (0.71, P< 0.001), thorax (0.66, P< 0.0001), right leg (0.74, P< 0.0001), left leg (0.35, P=0.002). Full body phase angle increased with low-risk patients over their hospital course (r2=0.62, P< 0.0001), while phase angle decreased with high-risk patients (r2=0.71, P=0.0006). Full body phase angle differentiated high risk patients (P< 0.0001), and phase angle of thorax differentiated between patients with and without inhalation injury (P=0.002). Conclusions Our study demonstrates that BIA measures changes in body composition and fluid shifts, identifies inhalation injury, and correlates with severity of injury in hospitalized burn patients. This pilot study included a limited number of participants with varying anatomic injuries presenting unique measurement challenges. Regardless, our preliminary data justifies a larger prospective study to confirm these results and correlate them with clinical outcomes.

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