Formation of spatio-temporal order of angular movements when doing squats by children of early preschool age

The article presents the results of the research of kinematic characteristics of squatting by children of late preschool age by use of the optical system of three-dimensional video analysis of movements. Analysis of the research results was carried out by the way of comparison of obtained data with the results of the similar researches of Candidates of Master of Sports and Masters of Sport in powerlifting. It is proved that children form motor actions at the basic level by the age of six. This level is characterized by the formation of temporal structure of angular movements at which time of bending in a joint is proportional to time of unbending; formation of spatio-temporal order of angular movements of a knee joint at which the temporal order of angular movements of joint bending is the reverse temporal order of angular movements by its unbending; formation of the mechanism of angular movements correction when performing series of squats. Besides, angular movements formation in kinematic structure of squats during ontogenesis is heterotropic. It is proved by different time of formation of spatio-temporal characteristics of angular movements and different time of formation of temporal order of angular movements in phases of bending and unbending. The conducted research allows to conclude that the order of angular movements when performing squats which is typical for Candidates and Masters of Sport in powerlifting is formed already at late preschool age children on the basis of the principle of heterotropia.