Graduate Thesis Or Dissertation
 

Magnesium and red blood cell fragility following heavy exercise of moderate duration in untrained teenage boys

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  • Eight adolescent males (14 to 18 years old) were evaluated before and after 50 minutes of exercise on a bicycle ergometer at 60 percent of their maximal heart rate to investigate the relationship between blood magnesium status and the derangement of other serum electrolytes in the etiology of "sports anemia." Criteria of assessment included changes in serum concentration and total serum content of magnesium, sodium, potassium, calcium, and red blood cell magnesium concentration, urinary magnesium excretion, hematocrit, hemoglobin, mean corpuscular volume, red blood cell count, osmotic fragility, reticulocytosis, and spherocytosis. A significant reduction in serum sodium concentration was found at post-exercise, whereas, serum calcium and potassium concentrations rose 3.8 percent and 7.7 percent, respectively. Total serum content of magnesium and sodium was significantly reduced by 4.9 percent and 9.0 percent, respectively, at post-exercise. Red blood cell magnesium dropped 3.1 percent at post-exercise. Following a one-hour recovery, serum magnesium concentration had fallen significantly (10.3 percent) and red blood cell magnesium concentration was 2.6 percent higher than the pre-exercise concentration. Although there was no evidence of red blood cell hemolysis, red cells did show spherocytosis and a tendency toward increased osmotic fragility. In addition, the changes observed in total serum magnesium content were significantly correlated to changes in total serum calcium at post-exercise and to total serum potassium content at recovery. The spherocytosis and decreased osmotic resistance appear to result from the impairment of magnesium-dependent adenosine triphosphatase, which is responsible for the active transport of sodium and potassium across the erythrocyte membrane.
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