Physical adaptability of the cardiorespiratory complex in sailors of European North

: The authors assessed physiological adaptation in 26 divers and 54 submariners doing military service in the Arctic circle of the European North. There was a stable regulation of cardiac rhythm due to its vasomotor component in the divers and autonomic lability in the submariners, a worse reaction to orthostatic changes during functional tests in the divers than in the submariners. The orthostatic test-induced reduction in the total power of the cardiac rhythm variability spectrum in the submariners was referred by the authors to as the asthenic phenomena caused by the specificity of their service activities. The distinctive type of divers' respiration, which was characterized by lower velocity properties and ample possibilities during forced respiration, was detected.