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The article presents the results of investigating the dynamics of the blood pressure among seamen in the period of 5 months continuous work on vessel. The study revealed that the number of seamen actually suffering from arterial hypertension is much more then ascertained in a pre-voyage medical examination. It was determined that the negative dynamics of the blood pressure level registered during the whole period of the voyage was most strongly manifested in the end of the voyage (after 6 months).

In this paper were characterized a sea work environment in that are sailors and meet one’s professional engagements during fishing voyage. Health negative factors were specified. Among one’s a more impacted are physical (noise, vibration, mechanical blow, interfrequency and ionization), chemical. Besides of technological affects a very important is climate geographic and social psychological agents. Widest impacts from this are temperature, air features, photoperiodical changes. A natural sea environment impact a high claims to organism homeostatic system and can lead to premorbid or pathological conditions. It was concluded about extreme sea work environment that affect to adaptive stress and regulatory system disturbances. This one led to health decrease and work decrement. A medical support system sailors must include allow for different adverse professional factors for developing a quality and safeguard working conditions.