fat-free body mass

Also found in: Acronyms.

fat-free bod·y mass

(FFM) (fat'frē bod'ē mas)
Body mass, primarily of muscle and bone, devoid of storage fat; a theoretic entity that contains the small percentage of non-sex-specific essential fat equivalent to approximately 3% of body mass (located chiefly within the central nervous system, bone marrow, and internal organs).
Synonym(s): lean body mass.
Medical Dictionary for the Health Professions and Nursing © Farlex 2012
References in periodicals archive ?
The results demonstrated that no significant difference existed between the two groups with respect to age, professional experience, weight, height, %fat, body fat, and fat-free body mass. In agreement, various international studies show similar results related to age (20,27), professional experience (15,17), body mass, height (20,27), %fat (22,27), fat mass, and fat-free body mass (5).
At subsequent visits, the following three test meals were giveninrandomorder:(1) 25 g glucose (45 mL Glutol),(2) L-leucine + L-phenylalanine (1 mmol/kg fat-free body mass each), and (3) 25 g glucose with L-leucine + L-phenylalanine (1 mmol/kg fat-free body mass) each with 120 mL water.
During weeks with adequate sleep, they lost 3.1 pounds of fat and 3.3 pounds of fat-free body mass (mostly protein).
Total body water is then used to estimate fat-free body mass and--by calculating the difference with body weight--body fat.
Fat-free body mass (FFM) and fat mass (FM) were expressed in kilograms (kg).