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The influence of exogenous fat and water on lumbar spine bone mineral density in healthy volunteers

Kim, KN; Kim, BT; Kim, KM; Park, SB; Joo, NS; Je, SH; Kim, YS; Lee, DJ
Yonsei medical journal, 53(2):289-293, 2012
Journal Title
Yonsei medical journal
PURPOSE: Changes in human body composition can affect the accuracy of spine bone mineral density (BMD) measurements. The purpose of this study was to evaluate whether fat and water in the soft tissue of the abdomen influence lumbar spine BMD measurements obtained using dual energy X-ray absorptiometry (DXA).

MATERIALS AND METHODS: Duplicate BMD measurements were carried out on healthy volunteers (10 men and 10 women) and the Hologic anthropomorphic spine phantom had on the same day before and after placement of following 3 materials in the abdominal area: lard 900 g, 1.5 cm thick; oil 1.4 liters in a vinyl bag; and water 1.2 liters in a vinyl bag.

RESULTS: In the case of human participants, following the placement of exogenous water to mimic extracellular fluid (ECF), there was a significant decrease in lumbar spine BMD (-0.012 g/cm², p=0.006), whereas the placement of exogenous lard and oil to mimic abdominal fat produced a slight increase in lumbar spine BMD (0.006 g/cm², p=0.301; 0.008 g/cm², p=0.250, respectively). The average percentage of lumbar spine BMD change with and without exogenous lard, oil, and water showed increase of 0.51%, and 0.67%, and decrease of 1.02%, respectively. Using the phantom, BMD decreased with the placement of both lard (-0.002 g/cm², p=0.699) and water (-0.006 g/cm², p=0.153); however, there was no difference in BMD after oil placement.

CONCLUSION: These results suggest that in cases where changes in fat and ECF volume are similar, ECF exerts a greater influence than fat on DXA lumbar BMD measurements.
MeSH terms
Absorptiometry, PhotonAdultBone Density/*drug effectsDietary Fats/pharmacologyFats/*pharmacologyFemaleHumansLumbar Vertebrae/*drug effects/*metabolismMaleWater/*pharmacology
Appears in Collections:
Journal Papers > School of Medicine / Graduate School of Medicine > Family Practice & Community Health
AJOU Authors
김, 규남김, 범택김, 광민박, 샛별주, 남석제, 상현이, 득주
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