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
| Identifer | oai:union.ndltd.org:ORGSU/oai:ir.library.oregonstate.edu:1957/27045 |
| Date | 09 March 1984 |
| Creators | Reiter, Christina Scribner |
| Contributors | Cerklewski, Florian L. |
| Source Sets | Oregon State University |
| Language | en_US |
| Detected Language | English |
| Type | Thesis/Dissertation |
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