[Manganese provision in trained and untrained schoolchildren and students in different seasons]

Examination of trained (43 skiers) and untrained senior schoolchildren (31 senior schoolchildren), low-order students-skiers (n = 110) and untrained (n = 17) students, high-order students-skiers (n = 39) and students not going in for sports (n = 60) established that in schoolchildren and students of both groups, the content of manganese in the blood plasma and corpuscles in the trained and untrained schoolchildren and students largely depended on the pattern of muscle activity rather than a season. In young skiers and high-order athletes, the level of manganese in both blood fractions was much higher almost at all stages of a follow-up, especially in the periods of increased training and race loads than that in the untrained persons of their age. In all the groups of senior schoolchildren and students, the dietary intake of manganese was season-independent and less than the recommended values, in schoolchildren in particular. In almost all, manganese balance was negative in both winter and summer. The exception was untrained group of students in whom manganese balance was positive in winter due the higher dietary content of the trace than that in other groups.