EURO-ECO 2007 Hanover 4 - 5 December 2007	Environmental and Engineering Aspects for sustainable living
	European Academy of Natural Sciences, Hanover European Scientific Society, Hanover Russian Academy of Natural Sciences, Moscow

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Nowadays the wide use of video display terminals (VDT) is characteristic of different professional spheres, in connection with it there is a necessity of careful estimation of their influence on workers’ health. It is known, that working at telephone exchanges is associated with high nervously-emotional and intellectual strain, hypo- and monotony, showing to operators’ organism the requirements on adaptation for influence of factors’ complex of the industrial environment. The given production factors are ranked as risk factors for development of cardiovascular pathology.

Our research is devoted to studying of influence production factors on a functional condition of cardiovascular system of the operators working at telecommunication “Kazakhtelecom” in Karaganda.

There were complex physiological investigations among 107 operators working at telecommunication in Karaganda. The investigation was made with regard to experience and age features, in the dynamics of labour shift, with parameters’ registration of central haemodynamics: rates of cardiac contraction (RCC), systolic and diastolic arterial pressure (SAP, DAP), pulse pressure (PP), rates of respiratory movements (RR) and heart rate (HR).

The analysis of research results revealed the level’s decrease of RCC by 6.1% at the end of a shift. Fast and proportional increase of SAP and DAP testified about a high reducing ability of myocardium and about a disbalance between the changes of heart emission and peripheral vascular resistance. To the end of a shift people of II experience - age group had the following parameters: DAP on 3,2 %, HRM on 0,7 %, thus SAP is decreasing on 0,4 %, PP on 10,6 %. Parameters of RR and RCC in dynamics of shift were within the limits of one level. The operators of III group had raised parameters at the end of a shift, they are RR on 3,4 %, RCC on 0,3 %, SAP on 4,2 %, DAP on 3,5 %, HRM on 0,8 % and PP decreased on 0,9 %. According to the spectral analysis results of HR the vegetative tone was defined by authentic domination of limbico-reticular center (spectrum’s power in a range of low frequencies - LF increased from 502,92±81,98 c to 590,45±173,61 c, р <0,001 and in a range of very low frequencies-VLF-from 296,22±33,76 c to 340,53±55,97 c, р <0,001). It shows to activity’s strengthening of segmentary levels of blood circulation regulation. During the shift high-frequency fluctuations HF into CP of operators increased on 4 % (from 350,02±46,03c to 364,77±64,68c, р <0,05) that testifies about vagal activity and dominance of vegetative nervous system’s parasympathetic department. During the shift the total power of operators’ respiratory waves (SPHF) has not changed that allowed to speak about an average level of heart rate’s autonomic regulation. In parameters of total power of slow waved components CP (SPLF) there were noted the high levels in the beginning of a shift (0,14±0,01 мс2), and to the end of a shift there was a decrease on 16,6 %. Total power of slow waves of the second order (SPVLF) at operators during did not change during a shift and it was at a level 0,05±0.01 мс2.

Thus, according to the experience and age and increased requirements to operator’s organism in conditions of industrial activity caused a pressure of higher degree, thus the adoption to a new level of functioning was provided by increasing of the activity both sympathetic and the parasympathetic systems.