[Electrical activity of the myocardium during work and at rest under hyperbaric conditions of many days duration].

Electrical activity of the myocardium in divers at rest and during physical work of various intensity under normal pressure and during one-week stay of these divers under the pressure of 5 absolute atmospheres (aatm) of N2O2. At rest and during the work of the same intensity the frequency of cardiac contractions under hyperbaric conditions was less than at 1 aatm. However, an increase in cardiac contractions during work was greater than at 1 aatm. During the work under increased pressure elevation of P wave of the ECG was more pronounced; this was possibly associated with the increased resistance in the pulmonary circulation in hyperbaria. There was noted reduction of the T wave amplitude and depression of the ST interval. Some divers displayed signs of aggravation of metabolic processes in the myocardium, disturbances of automation and conductivity.