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New York Chiropractor | New York chiropractic care | NY | Bioelectrical Impedance Analysis (BIA)

Roy H. Siegel, D.C., D.A.B.C.O.

Doctor of Chiropractic

Diplomate, American Board of Chiropractic Orthopedics

8 West 65th Street, Suite 1C
New York, NY 10023
(212) 769-8911

Bioelectrical Impedance Analysis (BIA)
 

What is BIA?


Bioelectrical impedance analysis is the study of the electrical properties of biological material and its change over time. This includes humans, animals, fish, plants, vegetables, fruits and anything living. Even human circulation and breathing can be quantified with a real-time BIA instrument that has enough sensitivity and a short sampling interval[1].


The most popular application for BIA is predicting human body composition as a total body measurement from hand to foot where resistance and reactance is evident from a biological circuit that conducts alternating current. The source electrodes introduce an alternating current (50 Khz) at the base of the toes and fingers. The detecting electrodes measure the voltage drop due to this circuit at the anatomical land marks of the ankle and wrist bones. This is a four electrode or tetrapolar measurement, which is essential to eliminate electrode and field distribution problems associated with two electrode measurements. The conducting media has a resistive and capacitive electrical path. These two values are independently measured and resolve the cellular and ionic components of the material. The cellular volume is measured as capacitive reactance and the resistive volume is ionic resistance, both are expressed in ohms. Modeling these two values as their series or parallel equivalent circuits is important when comparing them to criterion methods.


1. Nyboer, J.: Electrical Impedance Plethysmography. Second Edition. Charles C. Thomas, Springfield, IL, 1970. 


 
 
 
New York Chiropractor | Bioelectrical Impedance Analysis (BIA). Dr. Roy Siegel is a New York Chiropractor.