Document Detail

Submaximal exercise intensities do not provoke variations in plasma magnesium concentration in well-trained euhydrated endurance athletes with no magnesium deficiency.
MedLine Citation:
PMID:  21540144     Owner:  NLM     Status:  MEDLINE    
The purpose of this study was to assess the effect of exercise intensity during an incremental exercise test on plasma Mg concentration in well-trained euhydrated athletes. Twenty-seven well-trained endurance athletes carried out a cycloergometer test: after a warm-up of 10 min at 2.0 W·kg(-1), the workload increased by 0.5 W·kg(-1) every 10 min until exhaustion. Oxygen uptake (VO(2)), blood lactate concentration ([La(-)](b)), catecholamines, and plasma Mg were measured at rest, at the end of each stage and at 3, 5 and 7 minutes post-exercise. Urine specific gravity (U(SG)) was analyzed before and after the test, and subjects drank water ad libitum. Fat oxidation rate (FAT(oxr)), carbohydrate oxidation rate (CHO(oxr)), energy expenditure from fat (EE(FAT)), energy expenditure from carbohydrate (EE(CHO)), and total EE (EE(TOTAL)) were estimated using stoichiometric equations. Plasma Mg concentration at each relative exercise intensity (W·kg(-1)) were compared by means of repeated-measures ANOVA. Pearson's correlations were performed to assess the relationship between variables. The significance level was set at p<0.05. No significant differences were found in U(SG) between before and after the test (1.014±0.004 vs 1.014±0.004 g·cm(-3)). Nor were significant differences found in plasma Mg as a function of the different exercise intensities. Further, no significant correlations were detected between Mg and metabolic variables. In conclusion, acute exercise at a range of submaximal intensities in euhydrated well-trained endurance athletes does not affect plasma Mg concentration, suggesting that the plasma volume plays an important role in Mg homeostasis during exercise.
Marisol Soria; Carlos González-Haro; José L López-Colón; María T Llorente; Jesús F Escanero
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Publication Detail:
Type:  Clinical Trial; Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Magnesium research : official organ of the International Society for the Development of Research on Magnesium     Volume:  24     ISSN:  1952-4021     ISO Abbreviation:  Magnes Res     Publication Date:  2011 Jun 
Date Detail:
Created Date:  2011-06-30     Completed Date:  2011-12-13     Revised Date:  2012-02-23    
Medline Journal Info:
Nlm Unique ID:  8900948     Medline TA:  Magnes Res     Country:  England    
Other Details:
Languages:  eng     Pagination:  36-44     Citation Subset:  IM    
Department of Pharmacology and Physiology, School of Medicine, University of Zaragoza, Spain.
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MeSH Terms
Catecholamines / blood,  urine
Exercise Test*
Exercise Tolerance / physiology
Magnesium / administration & dosage,  blood*,  urine
Physical Endurance / physiology*
Reg. No./Substance:
0/Catecholamines; 7439-95-4/Magnesium

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