Effect of Exercise on the Metabolism of40Calcium and of47Calcium in Man

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Abstract
Ca40 balance ar turnover of radio Ca47 were studied in 3 human subjects maintained unde standard conditions of diet and activity in a metabolic ward, each patie serving as his own control. Moderate exercise in 3 pairs of experiments failed to produce consistent changes in Ca balance when the metabolism of Ca40 was followed on high (50 mg/kg/day) or low (3 mgAg/day) levels of dietary Ca. Retention of intravenously injected Ca47 was induced by exercise on both diets, as evidenced by an increase in the "total exchangeable Ca pool," a decrease both in the percentage of the dose excreted and in fecal specific activity, a decrease in the secretion of Ca into the intestine, and an increase in "bone formation rate. ".