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Nutrition Science and Everyday Application - beta v 0.1

Nutrition Science and Everyday Application - beta v 0.1

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388 ALICE CALLAHAN, PHD, HEATHER LEONARD, MED, RDN, AND TAMBERLY POWELL, MS, RDN<br />

Figure 7.11. Body composition measurement with whole-body air displacement<br />

plethysmography (ADP) technology or BodPod<br />

• Dual-energy X-ray absorptiometry (DXA). This method directs two low-dose X-<br />

ray beams through the body <strong>and</strong> determines the amount of energy absorbed from<br />

the beams. The amount of energy absorbed is dependent on the body’s content of<br />

bone, lean tissue mass, <strong>and</strong> fat mass. Using st<strong>and</strong>ard mathematical formulas, fat<br />

content <strong>and</strong> bone density can be accurately estimated. Although this is one of the<br />

most accurate methods of measuring fat mass, it is expensive <strong>and</strong> mostly used in<br />

research. It also requires low doses of radiation to the subject being tested, <strong>and</strong> is<br />

not appropriate for pregnant women.

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