The qualitative changes of human motor dimensions in boys between the ages of 10 and 14.

The main aim of the study was to establish the qualitative changes of motor dimensions between the ages of 10 and 14. The sample consists of 550 boys aged 10, 12 and 14. A battery of 26 tests was used for measuring motor abilities. The structure of motor abilities was established with the use of the factor analysis. The results show the emergence of significant qualitative changes of motor dimensions. Half of the motor factors change with age, while the rest of them remain stable. The motor dimensions, which are under the influence of regulation mechanisms of a higher order, change with age. In contrast to that, most motor dimensions which are dependent on mechanisms of a lower order are developmentally more stable. With the progression of age the structure of motor dimensions becomes increasingly well-defined. Observations of this study show that qualitative changes of motor dimensions are closely connected with the development processes.