There is a good explanation about bioimpedance in chapter 73 of Bronzino's Biomedical Engineering Handbook: http://upload.sm-7.net/Detali%20mashin/bmt/The%20Biomedical%20Engineering%20Handbook%20-%202Ed%20-%20Bronzino/ch073.pdf

Please remember that impedance is a more general concept than resistance (i.e. it is a function of frequency) . As we have cells with membranes the Bioimpedance of living tissue tends to be capacitive.

@Peter Husar

But that webpage is in German! :-))

Dear Peter

If you really want it to be useful, please post the full link to the lecture as most of us are not good with German and are unable to navigate the website of your institution and find the lecture... All I found was a notice of cancellation of the lecture at http://www.tu-ilmenau.de/bmti/mitteilungsarchiv/einzelmitteilung/newsbeitrag/13243/

Mit freundlichen Grüßen

Fernando

Bioimpedance is about the electrical properties of your body (or other biomaterials), e.g. to what extent you are a good conductor. Bioimpedance is a measure of how well the body impedes electric current flow. Fat has high resistivity, blood lower resistivity.