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[Providing athletes with trace elements during intensive exercise].

On the day of 30-km cross-country running, the content of iron, copper, and manganese in the diets of highly skilled adult athletes was found to be in the lower normal physiological range for those who do not go in for sports. During intensive exercise the intestinal and renal excretion of these substances was much greater than their dietary intake. The balance of all three substances was negative. Losses of iron and copper were not compensated for in the presence of their inadequate intake in the subsequent 3 days of rest following the race. The enrichment of diets with a complex of iron, copper, and manganese resulted in their retention in the athletes. As medical iron intake increased, there was a significant rise in the excretion of copper and manganese through the gastrointestinal tract.