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Abstract
It is common knowledge that during space missions (SMs) the cosmonauts are subjected to stresses. One of potential SMs problems is disorders in the bioelectrical parameters of the myocardium conductivity or arrhythmias. The paper analyzes the results of investigations into the changes of cardiac rhythm variability in a group of 5 cosmonauts (46 ± 4.5 yrs of age) using ECG records containing episodes of atrial and/or ventricular arrhythmias. Mean mission duration of each cosmonaut was about six months as a standard. Analysis of the experimental data on occurrence of cardiac rhythm disorders may point to SMs arrhythmogenicity. It was shown that frequency of ventricular extrasystoles in SMs increases in comparison with the baseline data. Atrial extrasystoles become more frequent by the end of SMs. The largest numbers of extrasystoles were recorded after extravehicular activities (EVAs). Assembly of the Russian orbital (service) station RO(S)S will increase the number of EVAs which should be taken into account, as additional loading on the cardiovascular system may provoke disorders in the cardiac rhythm.
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