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Related Experiment Videos

Is physical working capacity determined by optimal magnesium concentration?

G Stendig-Lindberg1

  • 1Department of Physiology and Pharmacology, Sackler Faculty of Medicine, Tel Aviv University, Israel.

Journal of Basic and Clinical Physiology and Pharmacology
|April 1, 1992
PubMed
Summary

Strenuous physical activity lowers serum magnesium (S-Mg), potentially causing deficiency. Restoring magnesium levels may optimize physical working capacity in Israelis, where deficiency is common.

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Area of Science:

  • Exercise physiology
  • Human nutrition
  • Biochemistry

Background:

  • Research in the 1970s explored strenuous exercise effects on serum magnesium (S-Mg) and S-Mg's impact on physical working capacity.
  • Studies indicate a prevalent marginal to overt magnesium deficiency in the Israeli population.
  • Adequate magnesium intake is crucial for overall health and physical performance.

Purpose of the Study:

  • To investigate the impact of strenuous physical exertion on serum magnesium levels in trained individuals.
  • To determine the relationship between serum magnesium concentration and indices of physical working capacity.
  • To assess the potential for magnesium supplementation to enhance physical working capacity in the Israeli population.

Main Methods:

  • Long-term studies involving moderately (70 km) and severely (120 km) strenuous forced marches in trained Israeli men.

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  • Monitoring of serum magnesium (S-Mg) concentrations at various time points post-exertion.
  • Assessment of physical working capacity indices, including maximal voluntary muscle contraction force (MVC) and maximal aerobic capacity (VO2max).

    • Main Results:

    • Strenuous exercise, particularly a 120 km march, led to a biphasic decrease in S-Mg, significant at 1 and 72 hours.
    • A 70 km march resulted in a statistically significant decrease in S-Mg after 72 hours.
    • Lowered S-Mg correlates with reduced maximal voluntary muscle contraction force and maximal aerobic capacity.
    • Chronic S-Mg reduction suggests intracellular magnesium depletion, indicating magnesium deficiency post-exertion.

    Conclusions:

    • Strenuous physical effort can lead to magnesium deficiency.
    • Magnesium status directly influences key physical performance indicators like muscle strength and aerobic capacity.
    • Optimizing physical working capacity in Israelis may require achieving magnesium saturation, given the population's inadequate intake and prevalent deficiency.