title: Polycardiographic and functional examinations of the circulatory system of physically little active workers employed in sea economy.
mesh_terms: D000328:Adult; D000367:Age Factors; D002318:Cardiovascular Diseases / Q000453:epidemiology*; D004734:Energy Metabolism; D006801:Humans; D008875:Middle Aged; D009326:Naval Medicine; D009790:Occupations; D005082:Physical Exertion