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Ionized and Total Magnesium Levels Change during Repeated Exercise in Older Adults
R Terink1, M G Balvers, C C W G Bongers
1Rieneke Terink, Stippeneng 4, building 124, 6708 WE, Wageningen, the Netherlands, telephone: 0031317-484067,
The Journal of Nutrition, Health & Aging
|June 25, 2019
Summary
Elderly adults experienced temporary decreases in ionized magnesium (iMg) during prolonged exercise. Levels returned to baseline after two days, indicating resilience in vital older individuals.
Area of Science:
- Gerontology
- Exercise Physiology
- Nutritional Biochemistry
Background:
- Magnesium is vital for health and physical performance.
- Older adults are reported to have sub-optimal magnesium levels.
- Physical exercise can temporarily reduce magnesium concentrations in the blood.
Purpose of the Study:
- To assess total magnesium (tMg) and ionized magnesium (iMg) in very old adults during prolonged exercise.
- To investigate the effects of consecutive days of exercise on magnesium levels in older individuals.
Main Methods:
- 68 participants (mean age 83.7 years) walked 30-40km daily for 4 days.
- Blood samples were collected pre-exercise (baseline) and post-exercise daily.
- Plasma tMg and whole blood iMg concentrations were analyzed.
Main Results:
- Ionized magnesium (iMg) decreased after day 1, increased after day 2, and decreased on day 4.
- Total magnesium (tMg) showed a minor increase after day 3.
- Sub-optimal iMg levels were observed in 88% of participants on day 1; sub-optimal tMg in 16% on day 2.
Conclusions:
- Prolonged exercise acutely affects iMg levels in older adults, similar to intensive exercise.
- Magnesium levels returned to baseline after two days, suggesting rapid adaptation.
- These exercise-induced magnesium changes did not lead to health problems or participant dropout.
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