Potassium Changes with Age

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Abstract
Total exchangeable K and Na, total body water and extracellular fluid volumes were measured in 69 patients aged 30-90+ yr, using multiple isotope techniques. The patients were not suffering from any chronic disorder or having K or diuretic therapy and were considered to be having a normal hospital diet. A direct correlation was shown between K and age, in that total exchangeable K decreased as age increased. The same relation was obtained when total exchangeable K was related to dry body weight and fat-free body water to age. Although total exchangeable Na diminished with increasing age, the ratio of total exchangeable K was .apprx. 1 at 30 yr of age increasing to .apprx. 2 at 90+ yr of age.

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