Bioelectrical impedance analysis

bioimpedancebioelectricalbioimpedance analysis
Bioelectrical impedance analysis (BIA) is a commonly used method for estimating body composition, in particular body fat and muscle mass.wikipedia
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Body composition

fat free massbody composition monitorsfat free mass (FFM)
Bioelectrical impedance analysis (BIA) is a commonly used method for estimating body composition, in particular body fat and muscle mass. In BIA, a weak electric current flows through the body and the voltage is measured in order to calculate impedance (resistance) of the body.
Another method is bioelectrical impedance analysis (BIA), which uses the resistance of electrical flow through the body to estimate body fat.

Body water

total body waterWaterfluid
BIA actually determines the electrical impedance, or opposition to the flow of an electric current through body tissues which can then be used to estimate total body water (TBW), which can be used to estimate fat-free body mass and, by difference with body weight, body fat.
Another method of determining total body water percentage (TBW%) is via Bioelectrical Impedance Analysis (BIA).

Electrical impedance

impedanceimpedancescomplex impedance
Bioelectrical impedance analysis (BIA) is a commonly used method for estimating body composition, in particular body fat and muscle mass. In BIA, a weak electric current flows through the body and the voltage is measured in order to calculate impedance (resistance) of the body. BIA actually determines the electrical impedance, or opposition to the flow of an electric current through body tissues which can then be used to estimate total body water (TBW), which can be used to estimate fat-free body mass and, by difference with body weight, body fat.

Body fat percentage

body fatfat masspercentage body fat
A number of methods are available for determining body fat percentage, such as measurement with calipers or through the use of bioelectrical impedance analysis.

Adipose tissue

adiposebody fatfat
BIA actually determines the electrical impedance, or opposition to the flow of an electric current through body tissues which can then be used to estimate total body water (TBW), which can be used to estimate fat-free body mass and, by difference with body weight, body fat. Results for some four- and eight-electrode instruments tested found poor limits of agreement and in some cases systematic bias in estimation of visceral fat percentage, but good accuracy in the prediction of resting energy expenditure (REE) when compared with more accurate whole-body magnetic resonance imaging (MRI) and dual-energy X-ray absorptiometry (DEXA).
In contrast with clinical tools, one relatively inexpensive type of body fat meter uses the principle of bioelectrical impedance analysis (BIA) in order to determine an individual's body fat percentage.

Dielectric spectroscopy

Electrochemical impedance spectroscopyImpedance spectroscopyAC impedance spectroscopy
In the field of human health monitoring is better known as bioelectrical impedance analysis (BIA) and is used to estimate body composition as well as different parameters such as total body water and free fat mass.

Dehydration

dehydrateddehydratedehydrating
Dehydration is a recognized factor affecting BIA measurements as it causes an increase in the body's electrical resistance, so has been measured to cause a 5 kg underestimation of fat-free mass i.e. an overestimation of body fat.

Electrical resistance and conductance

resistanceelectrical resistanceconductance
Dehydration is a recognized factor affecting BIA measurements as it causes an increase in the body's electrical resistance, so has been measured to cause a 5 kg underestimation of fat-free mass i.e. an overestimation of body fat.

Resting metabolic rate

resting energy expenditureREEresting metabolic rate (RMR)
Results for some four- and eight-electrode instruments tested found poor limits of agreement and in some cases systematic bias in estimation of visceral fat percentage, but good accuracy in the prediction of resting energy expenditure (REE) when compared with more accurate whole-body magnetic resonance imaging (MRI) and dual-energy X-ray absorptiometry (DEXA).

Magnetic resonance imaging

MRIMRI scanmagnetic resonance imaging (MRI)
Results for some four- and eight-electrode instruments tested found poor limits of agreement and in some cases systematic bias in estimation of visceral fat percentage, but good accuracy in the prediction of resting energy expenditure (REE) when compared with more accurate whole-body magnetic resonance imaging (MRI) and dual-energy X-ray absorptiometry (DEXA).

Dual-energy X-ray absorptiometry

DEXAdual energy X-ray absorptiometrybone densitometry
Results for some four- and eight-electrode instruments tested found poor limits of agreement and in some cases systematic bias in estimation of visceral fat percentage, but good accuracy in the prediction of resting energy expenditure (REE) when compared with more accurate whole-body magnetic resonance imaging (MRI) and dual-energy X-ray absorptiometry (DEXA). Nevertheless, it is DEXA - and not BIA - that is regarded as a "gold standard" or reference method in body composition analysis.

Electrical impedance tomography

Electrical Resistance Tomographyelectrical impedance tomography & electrical resistance tomographyInverse problems of conductivity

Samsung Bio Processor

The Samsung Bio Processor is an advanced system logic chip designed by Samsung Electronics in December 2015 that integrates five AFEs including bioelectrical impedance analysis (BIA), photoplethysmogram (PPG), electrocardiogram (ECG), skin temperature, and galvanic skin response (GSR) into a single chip that measures body fat, and skeletal muscle mass, heart rate, heart rhythm, skin temperature and stress level.

Overweight

big-bonedexcess body weightexcess weight

Cachexia

wasting syndromecachecticcancer cachexia
Imaging with quantification of muscle mass has been investigated including bioelectrical impedance analysis, computed tomography, Dual-energy X-ray absorptiometry (DEXA), and magnetic resonance imaging but are not widely used.

Ran Poliakine

The company secured several patents that utilized technology for patient monitoring, a system for electrical thoracic scans, and a method of measuring bioimpedance.

Lymphedema

lymphoedemaelephantiasiscongenital lymphedema
Bioimpedance measurement (which measures the amount of fluid in a limb) offers greater sensitivity than existing methods.

Focused impedance measurement

Many biological parameters and processes can be detected and monitored through their effects on bioimpedance.

Classification of obesity

Body volume indexbody mass indexBVI
The other is bioelectrical impedance analysis which uses electrical resistance.

Bariatrics

bariatricbariatric medicinebariatric approach
Techniques used in bariatrics include bioelectrical impedance analysis, a method to measure body fat percentage.

Journal of Electrical Bioimpedance

The journal publishes reviews, articles, and educational material covering research on all aspects of bioimpedance.