Results 261 to 270 of about 54,525 (292)
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Reliability for multiple frequency bioelectric impedance
American Journal of Human Biology, 1994AbstractMultifrequency impedance may help to quantify body fluid compartments and levels of hydration among individuals. Most studies of bioelectric impedance use impedance machines operating at a frequency of 50 kHz, and observer error is low. The present study evaluates multifrequency impedance measurements at 15 frequencies from 5 to 1,300 kHz to ...
Wm Cameron, Chumlea +4 more
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Bioelectric impedance measurements using synchronous sampling
IEEE Transactions on Biomedical Engineering, 1993We have applied synchronous sampling to the demodulation of bioelectric impedance signals. This overcomes the need for analog demodulators in bioimpedance measurements. The sampling rate is determined by signal bandwidth, rather than by the highest frequency component before demodulation.
R, Pallás-Areny, J G, Webster
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Effect of obesity on bioelectrical impedance
The American Journal of Clinical Nutrition, 1989The purpose of this study was to validate the use of bioelectrical impedance in assessing human body composition and to explore the use of this technique in obesity. Eighty-seven adults varying widely in body composition (range: 8.8-59.0% body fat) underwent measurement of bioelectrical impedance and underwater weighing (density).
D S, Gray +3 more
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Body Fat Estimation Using Bioelectrical Impedance
Hormone Research in Paediatrics, 2007<i>Background/Aims:</i> Although childhood obesity is a major problem, routine assessment methods do not reflect fat mass. Body mass index, which is most commonly used, gives an indication of weight for height and not a degree of adiposity. <i>Methods:</i> Bioelectrical impedance and dual-energy X-ray absorptiometry (DEXA) were ...
M G, Shaikh +3 more
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Bioelectrical Impedance Analysis in Dialysis Patients
Mineral and Electrolyte Metabolism, 1999Identification of malnutrition is imperative in chronic dialysis patients. Bioelectrical impedance (BIA) is a noninvasive method to measure body composition and estimate total body water (TBW), lean body mass (LBM) and body cell mass (BCM). Studies suggest BIA has good reliability as compared to other accepted methods of body composition analysis ...
L B, Pupim, P, Kent, T A, Ikizler
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Bioelectrical impedance measurement: Errors and artifacts
Journal of Renal Nutrition, 1999Bioelectrical impedance analysis (BIA) allows simple noninvasive estimation of body water, and it could potentially be a very useful technique for clinical monitoring and study of abnormalities of body water. It has been shown that the total body impedance is dominated by the arm (46%) and leg (44%). The trunk, which represents an average of 46% of the
B R, Di Iorio +2 more
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Segmental bioelectrical impedance analysis
Current Opinion in Clinical Nutrition and Metabolic Care, 2012Bioelectrical impedance analysis is a popular, noninvasive and practical method for assessment of body composition. The last decade has seen the development of impedance analyzers designed to assess the composition of body segments as well as the whole body.
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Changes in bioelectrical impedance during fasting
The American Journal of Clinical Nutrition, 1988Six obese females had daily measurements of bioelectrical impedance during a 2-wk fast and measurement of total body water (TBW) by deuterium oxide dilution before and at the end of the fast. The three related measures of resistance (R), reactance (Xc), and impedance (Z) were found to follow very similar patterns throughout the fast, increasing for the
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Bioelectrical impedance analysis revisited.
Lymphology, 2000Although total limb volume measurements are used to track the progress of lymphedema and its treatment, these measurements can be confounded by changes other than fluid excess namely muscle or fat gain. Bioelectrical impedance analysis (BIA) is a technique that specifically quantifies both total body fluid and extracellular fluid in extremities ...
D M, Mikes +6 more
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What Does Bioelectrical Impedance Spectroscopy (BIS) Measure?
1993The resistance of the human body to the flow of an alternating current is related to the volume of fluid in the body;l acute changes in fluid status alter body resistance 2,3 Experiments with infusion of saline4 have shown that bioelectrical impedance analysis is sensitive enough to detect minimal alterations in body fluid volume. Impedance methods can
M, Azcue +3 more
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