Abstract
During a year (in winter, spring, summer and autumn), a spirographic survey of one and the same group of healthy children (25 boys and 35 girls at intermediate school age born in the European North) was conducted. It has been detected that functionality capabilities of the external respiration system and the breathing level increased in children aged 11-14 y.o. in the transition period from the warm season to the cold season. The increased total lung ventilation in the girls in autumn was mostly explained by the increased respiratory volumes rather than by the respiration rate.
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