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The journal of nutrition, health & aging

, Volume 23, Issue 6, pp 595–601 | Cite as

Ionized and Total Magnesium Levels Change during Repeated Exercise in Older Adults

  • Rieneke TerinkEmail author
  • M. G. Balvers
  • C. C. W. G. Bongers
  • T. M. H. Eijsvogels
  • R. F. Witkamp
  • M. Mensink
  • M. T. Hopman
  • J. M. T. Klein Gunnewiek
Article

Abstract

Background

Magnesium is essential for health and performance. Sub-optimal levels have been reported for older persons. In addition, physical exercise is known to temporally decrease magnesium blood concentrations.

Objective

To investigate these observations in conjunction we assessed total (tMg) and ionized magnesium (iMg) concentrations in plasma and whole blood, respectively, during 4 consecutive days of exercise in very old vital adults. Design: 68 participants (age 83.7±1.9 years) were monitored on 4 consecutive days at which they walked 30–40km (average ∼8 hours) per day at a self-determined pace. Blood samples were collected one or two days prior to the start of exercise (baseline) and every walking day immediately post-exercise. Samples were analysed for tMg and iMg levels.

Results

Baseline tMg and iMg levels were 0.85±0.07 and 0.47±0.07 mmol/L, respectively. iMg decreased after the first walking day (−0.10±0.09 mmol/L, p<.001), increased after the second (+0.11±0.07 mmol/L, p<.001), was unchanged after the third and decreased on the final walking day, all compared to the previous day. tMg was only higher after the third walking day compared to the second walking day (p=.012). In 88% of the participants, iMg levels reached values considered to be sub-optimal at day 1, in 16% of the participants values were sub-optimal for tMg at day 2.

Conclusion

Prolonged moderate intensity exercise caused acute effects on iMg levels in a degree comparable to that after a bout of intensive exercise. These effects were not associated with drop-out or health problems. After the second consecutive day of exercise, levels were returned to baseline values, suggesting rapid adaptation/resilience in this population.

Key words

Older adults consecutive exercise days micronutrients reference values 

Abbreviations

ANOVA

Analysis of variance

BMI

Body mass index

HR

heart rate

iMg

ionized magnesium

LH

Lithium heparine

Mg

magnesium

Rpm

Revolutions per minute

tMg

total magnesium

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Copyright information

© Serdi and Springer-Verlag International SAS, part of Springer Nature 2019

Authors and Affiliations

  • Rieneke Terink
    • 1
    • 4
    Email author
  • M. G. Balvers
    • 1
    • 2
  • C. C. W. G. Bongers
    • 3
  • T. M. H. Eijsvogels
    • 3
  • R. F. Witkamp
    • 1
  • M. Mensink
    • 1
  • M. T. Hopman
    • 3
  • J. M. T. Klein Gunnewiek
    • 2
  1. 1.Division of Human Nutrition & HealthWageningen University & Research (WUR)Wageningenthe Netherlands
  2. 2.Clinical Chemistry and Haematology LaboratoryGelderse Vallei Hospital (ZGV)Edethe Netherlands
  3. 3.Radboud Institute for Health Sciences, Department of PhysiologyRadboud university medical centerNijmegenthe Netherlands
  4. 4.Wageningenthe Netherlands

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