Estimation of Lean Body Mass and Body Fat From Basal Oxygen Consumption and Creatinine Excretion

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Abstract
Body specific gravity, basal O2 consumption and creatinine excretion were detd. in metabolically-normal college students. The lean body mass for individuals may be predicted from basal O2 consumption, the result agreeing within [plus or minus] 10.5% of the densiometric value in 90% of cases. The lean body mass for individuals predicted from creatinine excretion agrees with [plus or minus] 13.1 % of the densio-metric value in 90% of cases. For groups of 50 or more, the prediction agreement in 90% of cases is [plus or minus] 1.5% for 02 and [plus or minus] 2.0 % for creatinine. The correlation and regression between relative body wt. and body fat in this group of subjects were too low to be of predictive value, due to the fact that relative wt. and lean body mass were highly correlated. Relative wt. predicts body fat with reasonable accuracy only when body fat exceeds 25-30% of body wt.

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