Bioelectrical Impedance

Bioelectrical Impedance - BIOELECTRICAL IMPEDENCE VIDEO:...

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
BIOELECTRICAL IMPEDENCE VIDEO: BIOELECTRICAL IMPEDANCE ANALYSIS: (BIA) -Technique to estimate body composition based on the difference in electrical conductive properties of various tissues OVERVIEW: -Electrodes are attached to the hand and feet of the volunteer -Not all of the applied current is detected -The extent to which the current is impeded or resisted is related to the type and amount of tissue through which it passes ADIPOSE TISSUE: -Doesn’t conduct electricity well -Only about 20% is water -Has a HIGH impedance -80% fat -Fat is an excellent resistor IMPEDANCE: -The degree to which a medium slows or stops an applied current -Has 2 Components: (1) RESISTANCE (R): -Measure of the amount of electrical current a substance will stop (2) REACTANCE (Xc) -Measure of a material’s ability to slow a current -At low frequencies, any current conducted through a body is passing thru ECF only. -Currents with a higher frequency are able to pass thru cell membranes- This allows the measurement of impedance of substances inside cells as well as outside of cells. -A frequency greater than 50kHZ is required
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 2
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 12/22/2009 for the course NFS 444 taught by Professor Koness during the Spring '09 term at Rhode Island.

Page1 / 2

Bioelectrical Impedance - BIOELECTRICAL IMPEDENCE VIDEO:...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online