Vol 27, No 1 (2020)

The problem of selecting a homogeneous group of subjects can be addressed by calculating the coefficient of variation or by using the ABC method. However, this is not sufficient for homeostatic systems. The aim of the study is to establish the statistical and chaotic patterns of parameters of the cardiovascular system among girls in the city of Surgut following North-South travel. Methods: The data on indicators of the cardiovascular system (CVS) of girls were collected using pulsoximeter EL0X-01. The obtained samples of cardiointervals (CI) were processed as matrices of pairwise comparisons of samples. Results. After two weeks of rest in the South of the Russia, the number of k pairs of samples in the matrices of pairwise comparisons decreases indicating changers towards increased heterogeneity in the CVS parameters. In general, with statistical paired comparison of samples of CI in the group of girls, only 2-15 % of pairs of samples can be attributed to one general population. The calculation of the pairwise comparison matrix of samples of CI for one subject showed that the samples with repeated measurements in the same homeostasis may statistically less match than in a group of different people. Conclusions. Traditional statistics in the description of the CVS has low efficiency, the behavior of the CI is chaotic, because the forecast of dynamics based on the analysis of previous states and the initial value x(t0) is impossible. In the work within the framework of the new approach from the standpoint of the theory of chaos-self-organization, the features of the parameters of the CVS of girls under the action of various climatogeographic factors are studied.

Objective: to study the content of cadmium and lead in the hair of the inhabitants of the Trans-Ural region of the Republic of Bashkortostan (RB). Methods. Chemical-analytical studies of samples were carried out in the licensed laboratory of the Center for Biotic Medicine (Moscow) by mass spectrometry with inductively coupled argon plasma. Statistical analysis was performed using the Statistica 6.0 software. Results. The distribution of cadmium and lead in the hair of the examined individuals was different from normal thus non-parametric methods of analysis were applied. The median (Me) content of cadmium in the hair of adult men was 0.089 |jg/g, which is higher than that for RB (0.075 |jg/g) and Russian Federetion (RF) (0.052 Mg/g). An increase in the level of cadmium compared to regional indicators was observed in 58.5 % of adult men. In the hair of girls aged 1-14 years, the level of lead was detected (Me = 0.764 Mg/g) compared with RB (Me = 0.410 Mg/g) and RF (Me = 0.727 Mg/g) lead level. The content of cadmium and lead in the hair of men and women had significant differences (p = 0.042 and p = 0.020 respectively). Conclusion: the results indicate the need to strengthen control over cadmium and lead level in the air, soil, water, food and develop measures to reduce the risk to public health.

Aim: to study heart rate variability in 102 women working as engineers at Surgut Research Industrial Institute in relation to duration of stay in the North and age. Methods: Heart rate variability was assessed using a diagnostic set "VNS-range" by the company 'Neurosoft'. Categorical data were analyzed using chi-squared tests. Statistica software was used for all calculations. Results: With increasing age, the values of the total power index (TP), the power of the very low frequency (VLF), and stress index (IS) significantly increase. The root-mean-square deviation of successive RR-intervals (SDNN), TP and the power of the high-frequency oscillation spectrum (HF) are significantly increase while the power of the low-frequency oscillation spectrum (LF) and the activation index of subcortical centers (IASC) decrease with increase in the duration of stay in the North. Thus, parasympathetic influences predominate with a tendency to vagotonia. At the same time, increases a state of stress to system of cardiohemodynamics. But, female engineers living in the North for up to 10 years have seen a significant tension in regulatory systems, since higher control levels are included in the regulation process, which leads to suppression of autonomous circuit activity and a decrease in the adaptive capabilities of the cardiovascular system. It can be assumed that the activation of the sympathetic link is considered as a nonspecific component of the adaptation reaction in response to various stressful effects. Decrease in heart rate variability indices indicates a changes in vegetative control and its regulation. The highest rates of HRV are recorded in healthy young people and living in the North for a short time. Decrease in these indicators may indicate adverse changes in the regulation of the cardiovascular system.

Purpose: to study gender-related peculiarities of psychological mechanisms of behavioral risk of HIV infection. Methods. The psychotype of the test subjects from the experimental group (17 men and 17 women-HIV-infected patients of the Volgograd AIDS Center), and the comparison groups (38 men and 22 women, graduate students and University professors of Volgograd, characterized by the lack of behavioral risk of HIV infection) was evaluated by a set of indicators of social activity and social destructiveness, adventurism, risk appetite, extroversion and neuroticism, accentuation of temperament and character. 112 men and 112 women, part-time students of Volgograd universities, selected by a simple random sample, who studied the relationship of the identified psychological indicators of the risk of HIV infection and personal characteristics of a person, taking into account gender, were involved as a control group of observation. Results. HIV-infected subjects, relative to persons with no behavioral risk of HIV infection, are characterized by the predominance of social destructiveness, reaching statistically significant differences for women (p = 0.014) and having a tendency to the significance of differences (p = 0.053) in men, as well as the prevalence of adventurism, reaching statistically significant differences for both men (p = 0.022) and women (p = 0.003). In the control group of observation, in men with respect to social destructiveness, a direct relationship with extroversion (p = 0,002), neuroticism (p = 0,049), pedantry (p = 0,008), excitability (p = 0,024) and emotivity (p = 0,047) was revealed. In the group of women presented indicators are characterized by negative relationship with social destructiveness by extroversion (p = 0,037), neuroticism (p = 0,049), excitability (p = 0,043) and emotivity (p = 0,031). Conclusions. The role of the inversion of gender psychotype on extroversion, neuroticism, accentuation of temperament and character in shaping the propensity of men and women to risky behavior is grounded.