FIGURE 5.
Histograms of FFM hydration (defined as TBW divided by FFM from DXA) (n = 23). More variance was observed with the use of BIA for TBW than with the use of D2O for TBW. The observed range of hydration values extends beyond physiologic bounds for healthy adults in the sample; definition of thresholds on plausible hydration levels may provide criteria to validate BIA TBW measurements. BIA, bioelectrical impedance analysis; DXA, dual-energy X-ray absorptiometry; D2O, deuterium; FFM, fat-free mass; TBW, total body water.