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Changes in serum and erythrocyte magnesium and blood lipids after distance swimming
M J Laires1, F Alves, M J Halpern
1Faculty of Medical Sciences, University of Lisbon, Portugal.
Abstract:
The effect of a 30 min. swimming exercise (freestyle) on plasma magnesium and other biochemical variables was assessed on 6 well trained swimmers. Blood samples were taken before, right after, 30 min. and 24 hours after exercise. Serum Mg concentration decreased significantly during exercise, returning to base line 24 hours after. Erythrocyte content in Mg did not show any significant changes. Plasma total cholesterol level decreased significantly 30 min. after exercise. A significant positive correlation found at rest between plasma Mg levels and plasma total H.D.L. cholesterol disappeared after exercise but was observed again 24 hours later.