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The Journal of Experimental Biology 205, 3101-3105 (2002)
© 2002 The Company of Biologists Limited

The effects of lipid location on non-invasive estimates of body composition using EM-SCAN technology

Edward T. Unangst, Jr* and Lance A. Merkley

Department of Biology, United States Air Force Academy, CO 80841, USA

* Author for correspondence (e-mail: tom.unangst{at}usafa.af.mil)

Accepted 16 July 2002

We evaluated the effect of lipid location on body-composition estimation accuracy using electromagnetic scanning (EM-SCAN), a non-invasive [total body electrical conductivity (TOBEC)] method. Molds were constructed that simulated a `general' small mammal, either 93% lean/7% lipid (control) or 82% lean/18% lipid (lipid-location groups). In the 18% lipid molds, we varied the location of the fat; simulating all the fat in the head, tail or midsection or simulating homogenous distribution. Comparisons were made between the EM-SCAN output of each lipid-location group, and multiple-regression techniques were performed to derive body-composition estimation equations for both lipid mass (ML) and fat-free mass (MFF). Device output varied significantly for all lipid-location groups even though all groups contained 18% body fat, showing a lipid-location effect on device output. Calibration equations derived for each lipid-location condition estimated both ML and MFF accurately, but an independent equation was required for each lipid-location condition. In situations where species significantly vary body fat content and location, for example during hibernation or reproductive periods, we suggest deriving a calibration equation that is more representative of the actual body composition to improve ML and MFF estimation accuracy using non-invasive EM-SCAN methods.

Key words: lipid, electromagnetic scanning (EM-SCAN), total body electrical conductivity (TOBEC), body composition






© The Company of Biologists Ltd 2002