What is bioelectrical impedance analysis based on?
Bioelectrical impedance analysis (BIA) is a method for measuring body composition based on the rate at which an electrical current travels through the body. Body fat (adipose tissue) causes greater resistance (impedance) than fat-free mass and slows the rate at which the current travels.
What is the basis for bioelectrical impedance?
An alternating current is used for bioelectrical impedance analysis because it penetrates the body at low levels of voltage and amperage. In a complex electrical structure such as the human body, the part of the fluid volume or TBW measured by bioelectrical impedance is also a function of the current frequency.
What is the bioelectrical impedance technique for body composition?
Bioelectrical impedance analysis (BIA) is a relatively simple, quick and non-invasive technique, to measure body composition. It measures body fat accurately in controlled clinical conditions but its performance in the field is inconsistent.
What is the principle behind BIA methods of measuring body composition?
The premise behind BIA is that FFM will be proportional to the electrical conductivity of the body. Fat-tissue contains little water, making it a poor conductor of electricity; whereas, lean tissue contains mostly water and electrolytes, making it an excellent conductor.
How do bioelectrical impedance scales work?
Body fat scales are easy to use. Such scales work with the help of sensors underneath your feet that use bioelectrical impedance. When you step on the scale, a small electrical current runs up through your leg and across your pelvis, measuring the amount of resistance from body fat.
What is the bioelectrical impedance analysis with one example?
Bioelectrical impedance analysis (BIA) is a method for estimating body composition, in particular body fat and muscle mass, where a weak electric current flows through the body and the voltage is measured in order to calculate impedance (resistance) of the body. Most body water is stored in muscle.
Why is bioelectrical impedance important?
Bioelectrical Impedance Analysis (BIA) is able to make an estimation of body composition (e.g. quantities of fat mass and fat-free mass) by running a small electrical current through the body. This is possible simply because different bodily tissues (e.g. muscle, fat, bone, etc.)
What does a BIA measure?
Bioelectrical impedance analysis (BIA) has been proposed for measuring fat-free mass, total body water, percent fat, body cell mass, intracellular water, and extracellular water: a veritable laboratory in a box.
What does body composition impedance mean?
The impedance is used to determine total body water (TBW), which can then be used to derive your fat-free mass—the portion of your body that does not contain fat, including your muscle and bone—and finally, body fat.
Is bioelectrical impedance accurate?
BIA is considered reasonably accurate for measuring groups, of limited accuracy for tracking body composition in an individual over a period of time, but is not considered sufficiently precise for recording of single measurements of individuals.
What is a bioelectrical impedance machine?
Bio-electrical Impedance Analysis (BIA) is a method used to monitor health by looking at body composition. It measures body fat in relation to lean body mass and is said to be more accurate than BMI testing.
What is BIA sensor?
Usually found on smart scales, a Bioelectrical Impedance Analysis (BIA) sensor can measure your body composition, such as your skeletal muscle mass or fat mass. The sensor sends microcurrents to the body to measure the amount of muscle, fat, and water in the body.
How does bioelectrical impedance analysis determine body composition?
Bioelectrical Impedance Analysis (BIA) determines body composition by running small electrical currents through the body. As the electrical conductivity is different between various bodily tissues (e.g. muscle, fat, bone, etc.) due to their variation in water content, the small electrical current passes through the tissues at different speeds.
When was bioelectrical impedance analysis ( BIA ) first available?
First commercially available in the mid-1980’s [1], bioelectrical Impedance Analysis (BIA) is an inexpensive and portable piece of body composition testing equipment.
Which is the best frequency for bioelectrical impedance analysis?
Bioelectrical impedance vector analysis (BIVA) is an easy-to-use single-frequency technique. Although BIVA can be performed using any current frequencies, the optimal performance is achieved with an operating frequency of 50 kHz, which allows impedance measurements with the best signal-to-noise ratio.
Where does total body impedance ( Z ) come from?
Total body impedance (Z) derives from resistance (R) and reactance (Xc). R and Xc represent the opposition to an alternating electric flow exerted, respectively, by the intra- and extracellular electrolyte solutions and by the interfaces of cell membranes and tissues.