LAUSR

The aim was to study the functional state of students in terms of their heart rhythm variability, lability of visual analyzers, physical capabilities and psycho-emotional state at the beginning and at the end of the apprenticeship. Methods: Altogether, 30 students training as turners were enrolled in a cohort and divided into more adapted (group 1) and less adapted (group 2) groups, according to the Eysenck's psychological types of personality and to Strelau's theory. Measurements wereperformed at the beginning and at the end ofthe apprenticeship. Heart rhythm variability, physicalcapabilities, thelability of the visual analyzer, and the psycho-emotional state wereassessed before and after the apprenticeship. Results: Less adapted individuals had more pronounced changes in heart rhythm variability: the decrease in the total spectrum power (SP) to 69,0 % in group 1 and to 84,7 % in group 2; the stress index (SI) at the end of the apprenticeship increased to 19.9 % in group 1 and to 90.9 % in group 2. The humoral-metabolic regulation mechanisms increasedto a greater extentin more adapted students: the relative value of the low-frequency waves power VLF% changed by 92.7 % in group 1 and by 45.0 % in group 2. The critical flicker fusion frequency at the beginning and at the end of the apprenticeship was 44.5 ± 0.6 Hz, 43.4 ± 0.5 Hz (p > 0,05), respectively, and the hand power 44.7 ± 0.4 kg and 45 ± 0.4 kg (p > 0,05). After the apprenticeship, students' state of health according to the SAN scale decreased by 27 % from 5.6 ± 0.3 points to 4.1 ± 0.2 (p < 0.001); their activity decreased from 5.5 ± 0.2 points to 4.2 ± 0.2 (p < 0.001) to 24 %; their mood decreased by 13 % from 5.4 ± 0.1 points to 4.7 ± 0.2 (p < 0.001). Conclusion: it is necessary to take into account students' adaptive capabilities when assessing the impact of production factors on the body during theapprenticeship.