The noise and functional disturbances of the cardio-vascular system in seamen

The work presents quantitative relations between service-dependent noise dose levels and "unspecific" for the noise influence remote effects basing on the study of the cardiovascular system of 207 members of the deck and engine room crews. The seamen observed had no hearing losses due to noise (according to the ISO standard 1999). The study carried out in the pause between sea-going voyages showed that when the length of the service exceeded 10 years the noise dose increment of 1 dB corresponds to the hypertension frequency increment of 2%. The increase of the dose and the length of the service turns out as a trend towards the diminished mean arterial pulse pressure (AP) and elevated diastolic and mean dynamic AP. By resorting to the correlation-regression analysis the information value of the mean dynamic AP for the noise influence evaluation was shown as well the possibility to determine the safe noise action dose which may not be over 100 dB at the service length under 40 years.