Purpose. To trace changing dynamics of vegetative and neurodynamic functions among children at the age of 5-7 during mental loads. The study usually starts for the senior pre-school and junior school age. Individual children’s features and work of organ systems ensure adaptive reactions (including those during intensive mental loads). Therefore, we should pay attention to age dynamics of statistical and spectral peculiarities of heart rhythm for pre- and post-load states of kids.
Material and methods. 112 children at the age of 5-7 participated in the research. They come from senior pre-school and junior school institutions in Sumy, a Ukrainian city. The research determines functional activities and nervous power of children via the Diahnost-1M methodology.
The Fazahraf methodology estimates values of the cardiovascular system and influence of the vegetative nervous system on the heart rhythm. The technique collected and analyzed electrical potentials of spectral peculiarities of regulatory functions and significant statistical values of the heart rhythm.
Because of the stage-by-stage research approach and data heterogeneity, we conducted a multi-level mathematical assessment. Most data were not subject to normal distribution since there was a sharp asymmetry of low-stage discretization.
Results. Children may have different features during and after mental loads. They can be defined via most spectral and statistical values of the varying heart rhythm.
The heart rhythm reactions among children at the age of 5 are shifted to sympathicotonia. During mental loads, the dominance of sympathetic influence and instable control of regulatory systems was typical for the 6-year-old sample. Besides, we established a relation between nervous power and cardiovascular activities (r=0.42; р<0.05). In contrast to other age samples, the 7-year-old group showed a balanced cooperation of the sympathetic and parasympathetic nervous systems. Simultaneously, there was an obvious resistance to external stimuli during mental loads (r=-0.36; р<0.05).
Conclusions. Children at the age of 7 are more adapted to solve mental tasks with a certain speed. Therefore, we should pay a great attention to age functioning of physiological systems. In this way, we may apply the person-centered approach within the study process to raise adaptive abilities of the children’s nervous system