Effect of prolonged exercise on calcium, magnesium and phosphorus metabolism

• Published in: Nihon Eiyō, Shokuryō Gakkai shi Vol. 50; no. 1; pp. 63 - 68
• Main Authors: Yamada, T. (Kanto Gakuin Women's Junior Coll., Yokohama (Japan)), Arita, M
• Format: Journal Article
• Language: Japanese
• Published: Japan Society of Nutrition and Food Science 1997
• Subjects: ACTIVIDAD FISICA; ACTIVITE PHYSIQUE; BLOOD SERUM; CALCIO; CALCIUM; exercise; FOSFORO; GLANDULA PARATIROIDE; HORMONAS; HORMONE; HORMONES; MAGNESIO; MAGNESIUM; PARATHYROID GLAND; parathyroid hormone (PTH); PARATHYROIDE; PHOSPHORE; PHOSPHORUS; PHYSICAL ACTIVITY; SERUM SANGUIN; SUERO SANGUINEO
• ISSN: 0287-3516; 1883-2849; 1883-2849
• DOI: 10.4327/jsnfs.50.63

The present study was designed to investigate changes in serum parathyroid hormone (PTH), and calcium (Ca), magnesium (Mg) and phosphorus (P) metabolism during prolonged exercise. Five middle-aged men (aged 31 to 38 yr) who were well trained in endurance exercise served as the subjects. Exercise was loaded for 175min with a bicycle ergometer at a target intensity of 50% VO2max- During the exercise, and for up to 50min after, the concentrations of serum free fatty acid, total Ca and PTH levels were elevated significantly. Urinary excretion of both adrenaline and noradrenaline was increased significantly. Large increases in the sum of sweat and urinary Ca or Mg excretion were observed, while fractional excretion of Ca and Mg fell and that of P was unchanged. These results demonstrate that urinary Ca and Mg excretion is decreased whereas no P diuresis is induced during prolonged exercise under the present experimental conditions.