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Department of Internal Medicine, Washington University School of Medicine, St. Louis, Missouri 63110
We evaluated palmitate rate of appearance (Ra) in
plasma during basal conditions and during a four-stage epinephrine
infusion plus pancreatic hormonal clamp in nine white and nine black
women with abdominal obesity, who were matched on fat-free mass, total and percent body fat, and waist-to-hip circumference ratio. On the
basis of single-slice magnetic resonance imaging analysis, black women
had the same amount of subcutaneous abdominal fat but less
intra-abdominal fat than white women (68 ± 9 vs. 170 ± 14 cm2, P < 0.05). Basal palmitate Ra
was lower in black than in white women (1.95 ± 0.26 vs. 2.88 ± 0.23 µmol · kg fat-free mass
1 · min
1, P < 0.005), even though plasma
insulin and catecholamine concentrations were the same in both groups.
Palmitate Ra across a physiological range of plasma
epinephrine concentrations remained lower in black women, because the
increase in palmitate Ra during epinephrine infusion was
the same in both groups. We conclude that basal and epinephrine-stimulated palmitate Ra is lower in black than
in white women with abdominal obesity. The differences in basal
palmitate kinetics are not caused by alterations in plasma insulin or
catecholamine concentrations or lipolytic sensitivity to epinephrine.
The lower rate of whole body fatty acid flux and smaller
intra-abdominal fat mass may have clinical benefits because of the
relationship between excessive fatty acid availability and metabolic diseases.
fatty acid; lipolysis; catecholamine; adipose tissue; stable isotopes
This article has been cited by other articles:
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B. Mittendorfer, O. Liem, B. W. Patterson, J. M. Miles, and S. Klein What Does the Measurement of Whole-Body Fatty Acid Rate of Appearance in Plasma by Using a Fatty Acid Tracer Really Mean? Diabetes, July 1, 2003; 52(7): 1641 - 1648. [Abstract] [Full Text] [PDF] |
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