Based on the results of a theoretical search and our own empirical research it has been firstly developed complex, differentiated, multifactorial system of organizing physical culture and health work with children of primary school age with complex developmental disorders in educational and rehabilitation centers. For the first time scientifically substantiated methodological concepts of organizing physical culture and health-improving work of schoolchildren with complex developmental disorders; the essence and structure of the phenomenon of "health-improving work of schoolchildren with complex developmental disorders in educational and rehabilitation centers". Components (methodological, organizational-activity, evaluative), criteria (anthropometric, functional, somatic, psychoemotional) and the levels of physical health of children with complex developmental disorders have been firstly determined. The factors and leading indicators that determine the level of physical health of children with complex developmental disorders have been identified. The peculiarities of psychophysical development and functional state of children with complex developmental disorders in comparison with their peers without complex developmental disorders have been revealed. A comprehensive, differentiated, multifactorial system of physical culture and health-improving work with younger schoolchildren with complex developmental disorders in the conditions of educational and rehabilitation centers has been developed and implemented, which has confirmed its effectiveness and importance. Physical and health work for children with complex developmental disorders has been planned taking into account the peculiarities of the organization of the day regime in the educational and rehabilitation center with other wellness measures and has been built in accordance with methodological approaches that reflect the content and essence of the experimental work: activity-personal, systemic and cultural.
The activity-personal approach has been reflected in taking into account the sensitive periods of development of pupils, the selection of appropriate means and methods of teaching and upbringing of the child.
To ensure physical, mental, social development of the child it should be provided a systematic approach to the harmonious formation of all components of health; physical and psychological preparation for active life and professional activity should be improved on the principles that ensure the health orientation and individuality of approaches; various forms of physical activity and other means of physical improvement might be used.
The use of the cultural approach in the pedagogical experiment made it possible to consider children with complex developmental disorders in the system of physical culture and health work as subjects of physical culture, whose activities are aimed at preserving existing health, preventing deterioration of health and physical and mental fatigue, confidence.
During the pedagogical research in the organization of experimental work for children with complex developmental disorders, the principles of individualization, differentiation, productive personality development, continuity and consistency, situational learning, educational reflection have been implemented.
The evaluation component involved the introduction of 3 types of controls: operative (before, during, and after classes), current (once every three months) and interim (at the end of the study), which allowed for continuous feedback to determine the effectiveness of the developed technologies of physical and health work.
