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Bioimpedance or biological impedance is defined as the ability of biological tissue to impede electric current . Passive response occurs when biological tissues are simulated through an external electrical current source . The electrical properties of biological tissues are currently categorized based on the source of the electricity, i.e., active and passive response. Hoffer introduced the association between total body impedance and total body water content in reference to tritium dilution techniques.
Philippson measured the impedance of biological entities, including blood cells and guinea pig muscle and liver of a frequency range of 500 kHz to 3 MHz, presaging modern researches into the frequency response of tissues. Thirty bioimpedance measurements were based on six different frequencies (1 kH, 5 kHz, 50 kHz, 250 kHz, 500 kHz, 1000 kHz) at each body segment (right arm, left arm, trunk, right leg, and left leg). The main weaknesses of DXA are its limited availability, its inability to measure very tall or obese individuals and the effect of body thickness on muscle mass measurements . The impedance measurements were performed with BIA (BIA 101 Anniversary, Akern, Florence, Italy), which applies an alternating current of 800 μA at a single frequency of 50 kHz. The classic BIVA procedure, which corrects bioelectrical values for body height, was applied, and fat-free mass, fat mass, and total body water were estimated. A tetrapolar bioelectrical impedance analyzer was used to determine measurements of resistance (R) and reactance (Xc). Multifrequency bioelectrical impedance analysis (BIA) 229, 230 is found as one of the core interest among the researchers in the field of bioelectrical impedance.
Bioimpedance analysis is a growing method for body compartments estimation in nutrition studies, sport medicine and evaluation of hydration rate, fat mass and fat free mass between healthy and diseased populations. Observation of body compartment fluctuations like fat free mass, fat mass and total body water from normal limits are considered as key factors to be used in bioimpedance analysis in healthcare applications. Another alternative method for analysis is real time processing of bioimpedance data which is currently introduced as a key feature for body health monitoring applications. The bioimpedance vector analysis method (BIVA) is a novel approach established essentially by Piccoli et al. 64,65 to estimate the hydration status using height indexed resistance and reactance data (R-Xc graph) from bioimpedance measurements. Bioimpedance analysis, as an independent method for the assessment of the human health status from absolute bioimpedance measurements, has triggered a new path of data analysis and interpretation.
Results suggestthat the efficiency of this technique is different based on the tissuestructure; a bioimpedance scan in the δ regime, 50–900MHz, showed the highest discrimination between malignant and normaltissues in mammary and lowest in kidney tissue.69 Such changes are further confounded with the compositionof tissue, e.g., lipid content.47 The bioimpedancemeasured over δ and γ frequency range could be efficientlyused to monitor events involving blood. Early research studying electrical propertiesof malignant and normal tissues of different types confirm the potentialof using bioimpedance for detection of malignancy. Water content is a helpful marker for evaluating thehealth of cells, as it is known that some underlying conditions, suchas cancer, particularly solid tumors, causes a change in water contentof the tissue.68 In case of cancer andmalignancy, the correlation of the defect with bioimpedance is notyet fully understood, changes in water content (perceptible at highfrequency) along with cell–cell interactions and extracellularmatrix reshaping (perceptible at lower frequencies) urge both cautionand promise in using diagnostic bioimpedance to identify, grade, orstratify solid tumors. Studies that use bioimpedance spectroscopy to monitor dissectedbiological tissue, e.g., to infer or establish meat freshness, showthe presence of the α-dispersion if the measurement frequencyis low enough. Alpha (α) and beta(β) ranges are regarded as the low-frequency regime for bioimpedance.Most literature use these frequency ranges to study biological processesbecause the impedance in this range reflects important informationon the structure and composition of tissue per se as well as its time-dependentrelaxation behavior.
Overall, our findings emphasize the need for a multidimensional approach to understanding HS-related QoL impairments and their associations with body composition and muscle health. Our study highlights the complex interplay between body composition, disease severity, and QoL in patients with hidradenitis suppurativa. This gap highlights the novelty of our study, as previous investigations focused on BMI rather than nuanced body composition metrics. Notably, regional body composition, particularly the distribution of adipose and lean mass across anatomical segments, may further elucidate metabolic disparities in HS. Women with HS exhibited significant changes in fat-free mass and predicted muscle mass when compared to healthy controls, whereas in men, only the limb skeletal muscle mass differed significantly between HS patients and controls.
The boundary potential data collected from the real objects (SUT) are sent to the PC and are processed to reconstruct the EIT images using the EIT reconstruction algorithm. Surface electrode array is a very important part of an EIT system as the boundary data quality, and thus the image quality depends on it. The boundary data collected from a complete EIT scan of the object are sent to the PC for image reconstruction. In EIT, an array of sensors or surface electrodes 57, 102, 106, 110, 186 is attached to the boundary of the DUT.
In excised muscle,the β-dispersion disappears 3 days post-excision due to disintegrationof the tissue. Following dissection, the real part of the impedance(resistance of tissue) increases over a 300 min period as the tissuegoes into rigor. At thisfrequency, the current was established through both the intra- andintercellular pathways.
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