Relationship of muscle protein to other components of the fat-free mass

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Abstract
The distribution of protein between the skeletal musculature and the remaining tissues of the body and the relationship of these components to the fat-free mass were studied in 70 male rats (39-247 days of age) and 20 female rats (45-108) days of age). The fraction of the body represented by each of these protein compartments was found to be highly correlated not only with the fat-free mass, but also with the water and mineral content. The percentage of the fat-free mass represented by muscle protein Increased rapidly between the ages of 39-70 days. Thereafter It remained constant. The combined non-muscular protein fraction of the fat-free mass was virtually unchanged throughout the life of the animal. In young rats the size of the rapidly increasing muscle fraction was shown to be highly correlated with published data on metabolic rates. This correlation indicates that the rapidly declining metabolic rates observed in young animals are primarily attributable to an equally rapid increase in relative muscle mass.

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