To the question of the formation of the longitudinal arch of the foot in children

The article deals with the research of the longitudinal arch of the children foot. The original hardware and software system is used. There were 1 561 persons observed (199 children of the first childhood, 394 people of the second childhood, 252 teenagers, and 716 persons of youthful age). The somatotype in each group of the girls and the boys was studied. In the period of the first childhood the gender distinctions of the longitudinal arch of the foot haven't been revealed, at the same time the somatotypical distinctions are found. The changes of the indexes and K-coefficient demonstrate the rising in the longitudinal arch in aged group from 4 to 7 years. The gender distinctions appear in the period of the second childhood and the somatotypical significant distinctions of the foot longitudinal arch increase in comparison to the first childhood period. The K-coefficient is observed to be higher in case of the boys-teenagers in comparison to the girls. This is the evidence of the lower position of the longitudinal arch of the foot in boys' case. The youthful period is characterized by the ontogenetical completion of the formation of the longitudinal arch of the foot and by its somatotypical and gender distinctions being most vividly expressed.