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. Author manuscript; available in PMC: 2015 May 6.
Published in final edited form as: JPEN J Parenter Enteral Nutr. 2012 Jan;36(1):96–107. doi: 10.1177/0148607111417448

Table 1.

Eigenvalues, Half-Life, and Steady States Resulting From Different Choices of FFM-FM Model Within a Core Energy Balance Equation67

Eigenvalue
 Half-Life, d
 Steady State, kg
FFM-FM Model M F M F M F Characteristics
Constant FFM –0.00126 –0.00126 551 551 74.8 65.3 Constant eigenvalue
Linear FFM –0.00323 –0.00323 215 215 75.1 65.5 Constant eigenvalue
Forbes curve66 with baseline body composition90 –0.00328 –0.00245 211 283 75.2 65.5 Eigenvalues dependent on gender
Forbes curve66 with baseline body composition89 –0.00344 –0.00254 202 273 77.6 67.9 Eigenvalues dependent on gender
NHANES curve90 –0.00334 –0.00287 208 242 74.9 64.7 Eigenvalues dependent on age, height, and gender

F, female; FFM, fat-free mass; FM, fat mass; M, male; NHANES, National Health and Nutrition Examination Survey.