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The main outcome measures were body mass index (BMI), fat and fat-free mass indices (FMI and FFMI), percent body fat, waist circumference, triceps and subscapular skinfold thicknesses, overweight and obesity, and whole-blood IGF-1.
When compared with other measures including waist circumference (WC), waist-to-height ratio (WtH), percent body fat (%BF), fat mass index (FMI) or fat-free mass index (FFMI), the researchers found BMI to be as good an indicator of clinical risks as the other measures of body size or composition.
There is an age-related reduction in fat-free mass in your body--which means a proportionate loss of this more metabolically active and energy-burning muscle tissue.
Mass has been shown in fat-free mass studies to correlate with fat carried (Rogers 1965, Rogers and Odum 1966).
In our 20s muscle is up to 60% fat-free mass, but by age 70 it's less than 40%.
Unfortunately, the relationships between fat-free mass (FFM) and muscle strength with VT1 and VT2 have not been previously investigated in older individuals, and available studies are limited to associations with V[O.
While both groups lost a similar amount of weight, the exercise-plusdiet group lost a great deal more fat and no fat-free mass, such as muscle.
These changes were mainly consequences of losses in BM and fat-free mass.