Abstract
Body composition, total body K, and urinary creatinine excretion were determined in 15 males. Creatine conversion rate, total body K, and urinary creatinine excretion were used in deriving equations for predicting muscle protein (MP), nonmuscle protein (NMP), and total body protein (P). To verify the accuracy of the predicted amount of MP and NPM, P predicted from total body K and urinary creatinine excretion was compared with P calculated from densitometric measurement. A highly significant correlation (r = 0.912, P< 0.01), and a standard deviation of [plus or minus]5.06% were obtained.