Gould Lacey M, Hirsch Katie R, Blue Malia N M, Cabre Hannah E, Brewer Gabrielle J, Smith-Ryan Abbie E
Applied Physiology Laboratory, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, USA.
Human Movement Science Curriculum, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, USA.
Am J Hum Biol. 2022 Feb;34(2):e23610. doi: 10.1002/ajhb.23610. Epub 2021 May 7.
Fat-free mass (FFM) accounts for ~80% of the variance in resting energy expenditure (REE), and this relationship is complicated by adiposity. The objective was to compare adjusted REE and contributions of skeletal lean mass and fat mass (FM) to adjusted REE in women with varying adiposity levels using a novel approach.
Women were divided into tertiles by body fat percent (%fat): Tertile 1 (T1): %fat = 18.5%-28.4%; Tertile 2 (T2): %fat = 28.5%-33.8%; Tertile 3 (T3): %fat = 34.0%-61.0%. Outcome measures were measured and adjusted REE, body composition (skeletal lean mass, FM, %fat) from dual-energy X-ray absorptiometry, and percent contribution of skeletal lean mass and FM to adjusted REE.
The main effect for tertiles (T1 vs. T2 vs. T3) was significant (p = .001); REE was significantly higher in T3 versus both T1 by 281 kcal/day (p = .001) and T2 by 215 kcal/day (p = .001). Expenditure from skeletal lean mass in T1 was significantly higher than T3 by 3.2% (p = .001). T3 had a significantly higher FM contribution than T1 by 5.1% (p = .001) and T2 by 3.9% (p = .001).
Women with elevated %fat experienced lower skeletal lean mass contribution and higher FM contribution to adjusted REE. FM may explain more of the variance in REE between women of different levels of adiposity.
去脂体重（FFM）约占静息能量消耗（REE）变化的80%，而这种关系因肥胖而变得复杂。本研究的目的是采用一种新方法，比较不同肥胖水平女性的校正REE以及骨骼瘦体重和脂肪量（FM）对校正REE的贡献。
根据体脂百分比（%脂肪）将女性分为三分位数：三分位数1（T1）：%脂肪=18.5%-28.4%；三分位数2（T2）：%脂肪=28.5%-33.8%；三分位数3（T3）：%脂肪=34.0%-61.0%。测量的结果指标包括校正REE、双能X线吸收法测定的身体成分（骨骼瘦体重、FM、%脂肪），以及骨骼瘦体重和FM对校正REE的贡献百分比。
三分位数（T1 vs. T2 vs. T3）的主效应显著（p = 0.001）；T3组的REE显著高于T1组，高出281千卡/天（p = 0.001），也显著高于T2组，高出215千卡/天（p = 0.001）。T1组骨骼瘦体重的能量消耗比T3组显著高3.2%（p = 0.001）。T3组FM的贡献比T1组显著高5.1%（p = 0.001），比T2组高3.9%（p = 0.001）。
%脂肪升高的女性对校正REE的骨骼瘦体重贡献较低，FM贡献较高。FM可能解释了不同肥胖水平女性REE差异的更多部分。
