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Someone should register the page "Pleth" and have it redirect to this one. Took me some looking on google to figure out that pleth was this.220.127.116.11 17:31, 13 May 2007 (UTC)
I know air displacement plethysmography is at the heart of the BodPod, used to assess %bodyfat by outfits like the NFL and the Clinical Nutrition Research Center ...--Billymac00 (talk) 20:23, 27 May 2008 (UTC)
It should be pointed out that plethysmographs need to be calibrated for the volume of the individual inside them, often using a calibration syringe to change the volume of the apparatus by a known quantity with the person inside, and then use the detected pressure change to calculated the starting volume.
I'm struggling to find a citation for this - I will leave that for more practiced individuals - but it's obvious if you think about it. — Preceding unsigned comment added by 18.104.22.168 (talk) 13:28, 5 December 2012 (UTC)