| Effect of physical activity on the metabolism of magnesium in the rat. | |
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MedLine Citation:
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PMID: 1955625 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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The influence of exercise and immobilization on magnesium (Mg) balance, as influenced by vitamin D, was evaluated in female Sprague-Dawley rats that were divided into four groups: exercised fed ad libitum, pair-fed exercised, immobilized, and control. After 9 weeks, Mg absorption and retention were higher in the exercised groups than in the control group; however, immobilization resulted in an increase in the urinary excretion of Mg and a negative Mg balance. Serum levels of 1,25-dihydroxyvitamin D [1,25(OH)2D] were higher in the exercised group than in the control group. The tibial content of Mg was higher in both exercise groups and lower in the immobilized than in the control group. In an additional experiment to evaluate the Mg balance during early adaptation to exercise training, no change was seen in Mg absorption and balance during the first 5 weeks of exercise, although serum levels of 1,25(OH)2D increased significantly. Immobilization resulted in a decrease in Mg retention without any effect on intestinal absorption. Urinary Mg was consistently higher in the exercised and immobilized groups than in the control group. Prolonged exercise training, after adaptation, increases and longer immobilization decreases intestinal absorption and retention of Mg. The influence of physical activity on Mg absorption is not necessarily mediated by vitamin D. Physical activity may influence mineral absorption by a mechanism associated with growth. |
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Authors:
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J K Yeh; J F Aloia |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't |
Journal Detail:
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Title: Journal of the American College of Nutrition Volume: 10 ISSN: 0731-5724 ISO Abbreviation: J Am Coll Nutr Publication Date: 1991 Oct |
Date Detail:
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Created Date: 1991-12-31 Completed Date: 1991-12-31 Revised Date: 2008-06-23 |
Medline Journal Info:
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Nlm Unique ID: 8215879 Medline TA: J Am Coll Nutr Country: UNITED STATES |
Other Details:
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Languages: eng Pagination: 487-93 Citation Subset: IM; S |
Affiliation:
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Department of Medicine, Winthrop-University Hospital, Mineola, New York 11501. |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Animal Feed Animals Calcitriol / blood Eating Female Immobilization / physiology Intestinal Absorption Magnesium / pharmacokinetics* Motor Activity / physiology* Physical Conditioning, Animal Rats Rats, Inbred Strains |
| Chemical | |
Reg. No./Substance:
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32222-06-3/Calcitriol; 7439-95-4/Magnesium |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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