[Hormonal regulation and metabolic inter-relations of magnesium].

Magnesium ion is of great importance in physiology by its intervention in 300 enzymatic systems, its role in membrane structure and its function in neuromuscular excitability. The skeleton is the first pool of magnesium in the body. Intestinal absorption, renal metabolism, bone accretion and resorption of magnesium are very similar to those of calcium.

Prevalence of magnesium and potassium deficiencies in the elderly.

Concentrations of magnesium and potassium in erythrocytes and plasma were determined in a population of 381 unselected elderly men and women, most of them in their eighties. The effects of biological factors (age, sex, weight) and a large set of pathological conditions, malignant or not, were examined. Analyses of variance showed a relation between age and concentrations of plasma potassium and between weight and concentrations of plasma magnesium.

Comparison of the feedback effect of magnesium and calcium on parathyroid hormone secretion in man.

Administration of high doses of magnesium is known to produce a decrease in parathyroid hormone (PTH) secretion in human patients but the effect of magnesium on the secretion of PTH in healthy man is not known. We have looked at the effect of a relatively moderate i.v.

[Feedback of the magnesium ion on the parathyroid hormone: differences in the action of magnesium sulfate and pyrrolidone carboxylate].

Fourty-five minutes after an intravenous injection of Mg SO4 (170 mg of element Mg), in 7 young and healthy men, a significant decrease in circulating 53-84 PTH has been observed. An injection of magnesium pyrrolidone carboxylate (170 mg of Mg) failed to induce changes in plasma levels of PTH. The urinary excretion of Mg was 2-fold higher after the injection of Mg SO4 than after the injection of magnesium pyrrolidone carboxylate.

Magnesium: metabolism and hormonal regulation in different species.

1. The magnesium ion is of great importance in physiology by its intervention in 300 enzymatic systems, its membrane role and its function in neuromuscular excitability. 2.