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Erythrocyte, plasma and urinary magnesium in men before and after a marathon

  • P. Lijnen
  • P. Hespel
  • R. Fagard
  • R. Lysens
  • E. Vanden Eynde
  • A. Amery
Article

Summary

Erythrocyte, plasma and urinary magnesium (Mg2+) concentration was measured in 23 runners before and after a marathon race. Blood samples were drawn from an antecubital vein the morning before the race (baseline), at 3 p.m. (2 h before the start), upon finishing and 12 h later. Compared with the baseline values, the intra-erythrocyte and plasma Mg2+ were decreased (p<0.05 or less) immediately after the marathon, from 2.13±0.16 to 2.02±0.18 mmol · l−1 cells and from 0.88±0.06 to 0.81±0.07 mmol · l−1 respectively. The Mg2+ concentration returned to pre-race values 12 h after completion of the marathon. The urinary Mg2+ excretion rate decreased (p<0.001) from 29±13 to 5±3 μmol · min−1 during the marathon and increased (p<0.05) 12 h after the race to 38±18 μmol · min−1. It is concluded that the reduction in plasma Mg2+ ion concentration during the marathon cannot be attributed to erythrocyte uptake, urinary excretion or loss in sweat. It is suggested that Mg2+ may be released from erythrocytes into the extracellular fluids during sustained exercise and taken up from these fluids by the adipose cells.

Key words

Magnesium Erythrocytes Plasma Marathon 

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Copyright information

© Springer-Verlag 1988

Authors and Affiliations

  • P. Lijnen
    • 1
  • P. Hespel
    • 1
  • R. Fagard
    • 1
  • R. Lysens
    • 2
  • E. Vanden Eynde
    • 2
  • A. Amery
    • 1
  1. 1.Hypertension and Cardiovascular Rehabilitation Unit, Department of PathophysiologyUniversity of Leuven (K. U. Leuven)LeuvenBelgium
  2. 2.Institute of Physical EducationUniversity of Leuven (K. U. Leuven)LeuvenBelgium

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