[Hygienic aspects of youth work brigades].

A comprehensive inquiry study was carried out on living conditions, labour and regime in youth brigades. Furthermore, a complex hygienic-physiological assessment was made of the work of the students gone on agricultural brigades on the base of studies on the changes in the cardiovascular system, energy expenditure, nervous-muscular and thermoregulatory apparatuses, as well as on the functional activity of sympathico-adrenal system. The work, done by the students-members of the brigades, is qualified as moderately heavy, and as heavy only in some labour operations.

[Age-related characteristics of reactivity of school children during mental processes].

An examination of 300 students was carried out, aged 9, 12 and 15, in the process of their training, aiming at the establishment of the characteristics of their reactivity to mental loading. Modern psychophysiological and biochemical methods were used in the dynamic follow up of the changes in CNS and neuroendocrine activity. Definite age and sex discrepancies were found, on the base of the analysis, in the CNS reactivity to mental loading.

[Cardiovascular system reactivity in children of primary schools studying by new academic programs].

A longitudinal study of cardiovascular reactivity is performed among school-children taught according to newly adopted educational programs. The experiment is conducted in a full day school with three-year duration of the elementary course. The daily and annual dynamics of the basic indicators under study: heart rate, systolic and diastolic blood pressure, pulse, pressure, beat volume of the heart and a circulatory efficiency index display a noteworthy difference between working capacity of school-children beginning their education at the age of 6 and 7 years throughout the three school years.