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Total-Body Potassium During the First Year of Life Determined by Whole-Body Counting of ⁴⁰K

Mayo Clinic and Mayo Foundation, Rochester, Minnesota

Correspondence: For reprints contact: Ladislav P. Novak, Dept. of Anthropology, Southern Methodist University, Dallas, Tex. 75222.

ABSTRACT

Total-body potassium was determined by whole-body counting of ⁴⁰K in 31 white, normal infant boys and in 33 infant girls at 1, 4, 9, and 12 months of age. Anthropometric measurements of skeletal growth, subcutaneous fat, and lean tissues supplemented measurement of total-body potassium. Infant boys had significantly higher amounts of total-body potassium at each age. Amounts of total-body potassium per kilogram of body weight were nearly the same in both sexes at all ages, except a decrease in relative amounts was observed at age 4 months in both sexes. The correlation coefficient between total-body potassium and chronologic age in infant boys and girls was 0.94 and 0.89, respectively; the correlation coefficient of total-body potassium with weight was 0.93 and 0.92, respectively. In relation to height, two intersecting regression lines showed the breaking point of total-body potassium at about 59.9 cm for infant boys and at about 64.3 cm for infant girls.