[Information hygiene and regulation of information for vulnerable groups of the population].

Development of information society engenders the problem of hygienic regulation of information load for the population, first of all for vulnerable groups. There are presented international and Russian normative legal documents and experience in this area, there are described the negative effects of information (such as stress, depression, suicidal ideations). There are considered social-psychological characteristics of vulnerable groups that requires their best protection from loads of information, doing harm, particularly in terms of reproductive health, family relationships, children, etc. There was noted the desirability of improvement of sanitary, legislation on the regulation of the information load on the population, especially in vulnerable groups, in terms of optimization of parameters of the signal-carriers on volume, brightness and the adequacy of the volume and content of information in radio and television broadcasting, in an urban environment and at the plant to preserve the health and well-being of the population.

Psychophysical assessment of sinusoidal whole-body vibration in z-axis between 0.6 and 5 Hz combined with different noise levels.

Nine healthy sitting males evaluated the intensity of vertical whole-body vibration (WBV) in z-axis at four frequencies (F1 = 0.63 Hz, F2 = 1.25 Hz, F3 = 2.5 Hz, F4 = 5 Hz) and two intensities (I1 = 1 ms-2 rms, I2 = 2 ms-2 rms) by cross-modality matching (CMM). The subjects were simultaneously exposed to low-frequency noise at two levels (L1 = 65 dBA, L2 = 86 dBA). L1 and L2 were context conditions which did not have to be evaluated by CMM. The results indicate a flat response between F2 and F3; the sensitivity increases towards F1. Different exponents of Stevens' power law for the frequencies of WBV contradict the frequency range tested to be a sensory continuum. L2 caused practically significantly stronger sensations of the WBV-intensity from F1 to F3 (I1) and at F2 (I2). No synergistic effect of noise and WBV was shown at F3I2. Weighting factors were calculated for all exposure conditions using Stevens' power law. The weighting of F2 and F3 contradicts that of the International Standard ISO 2631-1985 (E). The results enable recommendations for the frequency weighting of WBV between 0.63 and 1 Hz, as well as for the equivalence of noise and WBV with combined exposure.

[The effect of low-frequency whole-body vibration on the vestibular apparatus]. / Einfluss niederfrequenter Ganzkörpervibration auf den Vestibularapparat.

For the first time, effects of very low-frequency whole-body vibration (WBV) on the functional state of the vestibular system were examined by means of electronystagmography (ENG) which is considered as a sensitive and adequate method. During vertical WBV-exposure with 0.6 Hz and 1.87 ms-2 rms for 50 minutes, a vertical nystagmus was observed. The results suggest the applicability of the ENG under laboratory conditions with WBV-exposure as a method for the assessment of the vestibular function. Changes of ENG amplitudes occurred with longer duration of WBV-exposure; they were different between subjects.