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There is some evidence that strenuous exercise may increase magnesium losses in sweat and urine by 10-20% [1]. Although the research on magnesium depletion and running is lacking, it can be assumed that high mileage may lead to some magnesium depletion. 

A magnesium intake less than 260 mg/day 220 mg/day for male and female athletes, respectively, may result in a magnesium-deficient status [1]. Evidence suggests that magnesium supplementation or increased dietary intake of magnesium may have beneficial effects on exercise performance in magnesium-deficient individuals. 

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  1. Nielsen FH, Lukaski HC. Update on the relationship between magnesium and exercise. Magnes Res. 2006;19(3):180-189.