Talk:Bioelectrical impedance analysis

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Untitled

Is this how body fat scales work? --Abdull 17:16, 15 May 2006 (UTC)[reply]

Yes. DrVeghead 22:54, 31 May 2006 (UTC)[reply]

Samsung

Why is the Samsung device mentioned so prominently? Portable body fat percentage analyzers are available for some time already. --Abdull 10:11, 13 August 2006 (UTC)[reply]

Non-broken link to Kyle's article

Found non-broken link to Kyle's article: http://www.ake-nutrition.at/uploads/media/bia1_Kyle_et_al.pdf

^ Ursula G. Kyle; et al. (2004). "Bioelectrical impedance analysis part I: review of principles and methods" (PDF). Clinical Nutrition. 23 (5): 1226–1243. doi:10.1016/j.clnu.2004.06.004. {{cite journal}}: Explicit use of et al. in: |author= (help)

Danilo.Piazzalunga (talk) 15:54, 22 June 2009 (UTC)[reply]

Removed dubious unreferenced content

I removed the following because it make no sense in terms of the physics of the measurement, and has indicators of confusion re. science in the writing: "sinus waves", "'withering' cells", "most meaningful...at 50 kHz", "measured in ° (degrees)", etc. Membrane potential is irrelevant to impedance. 66.127.52.57 (talk) 19:49, 11 July 2010 (UTC)[reply]

Every metabolically active cell of the body has an electrical potential difference at the cell membrane of about 50-100 mV. This membrane potential allows the cell to act in an alternating electrical field like a spherical condenser. As alternating current has a sinus wave, this shift is measured in ° (degrees) and is described as a phase angle ϕ (phi) or α (alpha). Expressed figuratively, well nourished, "plump"cells with stable membrane potentials have a large phase angle, whereas poorly nourished, "withering" cells with low membrane potentials have correspondingly small phase angles.

The phase angle is most meaningful at a frequency of 50 kHz. A pure cell membrane mass would have a phase angle of 90 degrees, pure electrolyte water has a phase angle of 0 degrees. The phase angle is thus directly proportional to the body cell mass BCM. In contrast to cells of the body cell mass, fat cells, which are purely storage cells, have hardly any metabolic activity, only possess a minimal membrane potential and cannot be detected by phase sensitive measurements.

Limitations?

Several products are surfacing whose marketing materials advertise a dogpile of measurements the scales supposedly take. In addition many of the measures use heuristics based off self-reported demographic archetypes and age/height measurements, which is somewhat sound practice until they start to get creative with the archetypes. It would be useful if this article could shed some light on what is and is not an actual reading, and which "readings" are something that could simply be calculated from other more common readings. For example, while a scale may include software that guesses your "daily caloric intake" based on a series of readings, it might not actually be measuring anything more than the garden variety BMI scale. (71.233.167.118 (talk) 01:31, 3 January 2013 (UTC))[reply]

Phase Angle

I agree with "Removed dubious unreferenced content" comments above. I removed the 'phase angle' section because it does not adequately describe the measurement and provides no references.

"Some BIA devices have phase-sensitive electronics to distinguish between electrical resistance and reactance." — Preceding unsigned comment added by Keymoto159 (talk • contribs) 00:27, 5 December 2013 (UTC)[reply]

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