Development of the quantitative ballistocardiographic characteristics in children

Based on the examination of 493 boys and girls of ages 6-19 years, we have tried to express the relationship of quantitative ballistocardiographic characteristics to age. The absolute values exhibit increase which is common up to 13 years of age but is then followed by the steadily enlarged decline of curves. The relative values exhibit decrease with age and the differences between boys and girls get gradually larger, being smaller inrelation to the lean body mass than to the body weight. It bears evidence to the fact that body fat plays a certain role in relative values.