Journal for the Integrated Study of Dietary Habits
Online ISSN : 1881-2368
Print ISSN : 1346-9770
ISSN-L : 1346-9770
Sodium, Potassium, Calcium, Magnesium and Phosphorus Balances during 5 Days of 1 Hr or 2Hrs/Day of Exercise
Tetsuo YamadaShin-ichi KurasawaHisaya KasaharaJunzo Hayashi
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1995 Volume 6 Issue 3 Pages 23-33

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Abstract

The present study was designed to investigate changes in sodium (Na), potassium (K), calcium (Ca), magnesium (Mg) and phosphorus (P) balances during five days of 1 hr or 2hrs/day of exercise under the dietary conditions maintaining nutrient intakes per 1, 000 kcal of energy intake. Five healthy men served as the subjects. The experiment consisted of each 5 days of 1st and 2nd exercise period, preceded by 6 days of rest period. On the exercise period, exercise was loaded for 60 min (1st period) or 120 min (2nd period) with a bicycle ergometer at a target intensity of 60% of VO2max. Extra energy intake was calculated in proportion to energy consumption by additional exercise. The increase in sweat Na, K, Ca and Mg excretions over the levels on the rest period was lower than the increase in these intakes. Na and P retention due to decrease in urinary excretion was observed, but K, Ca and Mg balances were unchanged. Urinary aldosterone excretion and serum parathyroid hormone (PTH44-68) were slightly increased. These results suggested that the dietary method maintaining nutrient intakes per 1, 000 kcal of energy intake during exercise is reasonable in these minerals.

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