New bimester model of academic year organization has been implemented at the University school (USH) of Moscow City University (MGPU). It consists of 6–7-week sessions with a two-week vacation. The change in the structure of the educational process is aimed at preventing fatigue of students, psychosomatic disorders and chronic diseases. The comprehensive medical examinations of primary school students have been conducted for 3 years in USH, at the beginning and at the end of the school year. It is estimated that for the period of longitudinal observation the prevalence of chronic diseases and neuropsychiatric disorders did not increase among students.

Presents data on influence of training on the background of the bimester model of the organization of the school year, implemented at the University school of Moscow city pedagogical university, on the functional state of the organism of younger students. The results of dynamic observations is given in comparison with data on the hygienic assessment of alternative and traditional variants of school year in elementary school.