The Effect of Auditory Stimulation on the Nonlinear Dynamics of Heart Rate: The Impact of Emotional Valence and Arousal.

Background: Although it is known that sound exposure evokes changes in autonomic activity, the effects of noise and music on the nonlinear behavior of heart rate fluctuations remain poorly understood and controversial. This study aims to assess the influence of sound subjective emotional valence and arousal on the nonlinear characteristics of the autonomic nervous system during passive listening.

Methods: In this study, 42 subjects listened to four sounds: (1) white noise, (2) road traffic noise, (3) excitatory music, and (4) a lullaby.

Heart rate variability in mental stress: The data reveal regression to the mean.

This data article aimed to assess whether there is a relationship between baseline heart rate variability (HRV) and mental stress-induced autonomic reactivity. Out of 1206 healthy subjects, 162 students were randomly selected to participate in this study. Participants were presented with a mental arithmetic task of 10 min duration.

State Anxiety and Nonlinear Dynamics of Heart Rate Variability in Students.

Objectives: Clinical and experimental research studies have demonstrated that the emotional experience of anxiety impairs heart rate variability (HRV) in humans. The present study investigated whether changes in state anxiety (SA) can also modulate nonlinear dynamics of heart rate.

Methods: A group of 96 students volunteered to participate in the study.

[Heart rate variability and blood pressure during mental stress].

The goal of this study was to evaluate the changes in blood pressure (BP) and heart rate variability (HRV) parameters due to a mental load. The findings indicate that mental arithmetic stress causes prompt increases in BP, heart rate and induced decreases in HRV. A shift toward an increase in sympathetic tone and changes in Poincare plot measures were observed during mental stress.

[Effects of anxiety on cardiorespiratory function].

The present study was undertaken to investigate the effect of anxiety on pulmonary function parameters and respiratory sinus arrhythmia (RSA) in healthy people under real-life conditions. This study consisted of two interrelated parts. During the first stage, eighty healthy students were examined in the following sequence: recording of heart rate variability (HRV) and respiration parameters at rest and shortly before real life stress.

[Features of cardiovascular functioning during different phases of the menstrual cycle].

The purpose of the present study was to determine whether there is a menstrual cycle effect on heart rate, blood pressure and heart rate variability. 10 healthy regularly cycling females (age 19-23 years) were studied during the follicular phase and luteal phase over two month. We found significant changes in heart rate, AMo and stress index during the menstrual cycle with a minimum in the follicular phase and maximum in the luteal phase.

Initial empiric antimicrobial treatment of Chlamydia pneumoniae: a study of 54 cases in the Republic of Macedonia.

Unlabelled: Analysis of the adequacy of the initial empiric antimicrobial treatment of patients with acute Chlamydia pneumoniae (CP) infection, admitted to the Infectious Diseases Clinic, Clinical Centre, Medical Faculty, Skopje, Republic of Macedonia, for community-acquired pneumonia.

Material And Methods: A total number of 407 patients with community-acquired pneumonia (CAP) hospitalized at the Clinic between September 1997 and June 2002, with an average age of x=46.44 years, of whom 53.

Intra-familial spread of acute hepatitis B virus infection.

Aim: The prevalence and incidence rates of hepatitis B virus (HBV) infection in our general population, have been assessed as in countries with intermediate endemicity. The geographical variation in the prevalence rate of HBV infection is also known. The aim of this study was to estimate the incidence rate of HBV infection among family contacts of patients suffering from acute hepatitis B and to determine the need for immunoprophylaxis i.

[Methodological principles of the improvement of monitoring of the effects of man-made environmental factors on human health].

The paper reflects the basic principles in improving methods for studying the influence of environmental factors of anthropogenic origin on health. The basic principles of human toxicology, physiology, and genetics became a theoretical basis of this improvement. The main point of the paper lies in the variability of the body's adaptive capacities, which is caused by a complex of endogenous and exogenous factors.

[Effects of air pollution on stillbirth rates in an industrial town].

The impact of seasonal variations in ambient air pollution with some compounds (suspended matters, sulphur dioxide, carbon oxide, nitrogen dioxide) on stillbirth was studied. Changes in the concentration of the studied pollutants were found to affect stillbirth.

[Effect of air pollution on respiration in children].

Study of the respiratory system in children living in the town of Cheboksary showed the highest incidence of diseases of the respiratory tract in children living in the districts with the highest levels of atmospheric air pollution.