Foster G D, Wadden T A, Vogt R A
University of Pennsylvania School of Medicine, Philadelphia, PA, USA.
Obes Res. 1997 Jan;5(1):1-8. doi: 10.1002/j.1550-8528.1997.tb00276.x.
The prevalence of obesity among African American women approaches 50% and greatly exceeds rates for Caucasian women. In addition, black women lose less weight than white during obesity treatment and gain more weight when untreated. This study assessed resting energy expenditure (REE) and body composition in obese white (n = 122) and black (n = 44) women to explore the relationship between biological variables and these observed differences. REE and body composition were assessed by indirect calorimetry and densitometry, respectively, before weight loss. REE was significantly lower in black subjects (1637.6 +/- 236.9 kcal/d) than in white (1731.4 +/- 262.0) (p = 0.04). REE remained significantly lower in blacks than whites after adjusting for body weight (p = 0.02). REE, adjusted for fat-free mass, was also significantly lower in blacks than whites (p < 0.0001), although the overestimation of fat-free mass by densitometry in blacks may have contributed to this finding. There were no differences between the groups in respiratory quotient. These results suggest that a decreased REE may exist in obese black women, and it may be related to the observed differences between black and white women in the prevalence of obesity and in the response to weight loss treatment. These cross-sectional findings await confirmation in longitudinal studies.
非裔美国女性的肥胖患病率接近50%，大大超过了白人女性的患病率。此外，在肥胖治疗期间，黑人女性比白人女性减重更少，而在未接受治疗时体重增加更多。本研究评估了肥胖白人女性（n = 122）和黑人女性（n = 44）的静息能量消耗（REE）和身体成分，以探讨生物学变量与这些观察到的差异之间的关系。在减重前，分别通过间接测热法和密度测定法评估REE和身体成分。黑人受试者的REE（1637.6 +/- 236.9千卡/天）显著低于白人（1731.4 +/- 262.0）（p = 0.04）。在调整体重后，黑人的REE仍显著低于白人（p = 0.02）。调整无脂肪体重后的REE，黑人也显著低于白人（p < 0.0001），尽管密度测定法对黑人无脂肪体重的高估可能导致了这一结果。两组之间的呼吸商没有差异。这些结果表明，肥胖黑人女性可能存在REE降低的情况，这可能与观察到的黑人和白人女性在肥胖患病率以及对减重治疗反应方面的差异有关。这些横断面研究结果有待纵向研究的证实。
