Thesis (M.S.)--University of Wisconsin--Madison, 1966. / eContent provider-neutral record in process. Description based on print version record. Bibliography: l. 67-72.

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. / Graduation date: 1984

Thesis (M.S.)--University of Wisconsin--Madison, 1969. / eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references.

Thesis (M.S.)--University of Wisconsin--Madison. / Typescript. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (leaves 37-41).

The purpose of this study was to compile a table of the reported magnesium contents of 100 gram portions of commonly used foods and to calculate the magnesium content in the certain experimental diets given to 12 preadolescent girls during 53 days in the summer of 1958, The subjects were six and one-half to nine years of age. Each subject was of normal math and weight for their height and age. The diets were adequate in all nutrients as recommended by the National Research Council (34) except for the nitrogen intake which averaged 3.46 grams daily for five six-day periods, and 2.83 grams for the following three six-day periods. / Master of Science