[Hemodynamic and cardiac cycle phase structure study of the Saliut-4 crew]. / Issledovanie gemodinamiki i fazovoi struktury serdechnogo tsikla u ékipazha "Saliut-4".

The paper gives the results of physical examinations of P.I. Klimuk and V.I. Sevastyanov during their flight aboard the orbital station Salyut-4. The examinations were carried out by means of the Polynomial-2 device at rest and under the conditions approximating basal metabolism. Since the end of the first flight week the circulation parameters did not differ substantially from the preflight values. Stroke volume and cardiac output increased slightly. In weightlessness circulation parameters varied with respect to the work done by the cosmonauts. On the first postflight day peripheral resistance, arterial pressure and cardiac output were increased.

[Dynamics of the blood circulatory indices in the crew of the Saliut space station in a functional test under physical load]. / Dinamika pokazatelei krovoobrashcheniia u ékipazha kosmicheskoi stantsii "Saliut" pri funktsional'noi probe s fizicheskoi nagruzkoi.

On the 4th, 9th, 16th and 21st days of the "Salyut" mission the crewmembers performed exercises with a load of about 1100 kgm. The results were compared with those obtained on the Earth. Immediately after the tests the crewmembers showed an increased heart rate and greater changes in the diastolic and pulse pressure, cardiac output and left ventricular ejection time. The above parameters returned to the normal at a slower rate. A comparison of the values recorded on different flight days did not demonstrate a distinct correlation between the changes and time of the weightlessness exposure.

[Change in the hemodynamics and phase structure of the cardiac cycle in the crew of the 2d "Saliut-4" expedition]. / Izmenenie gemodinamiki i fazovoi struktury serdechnogo tsikla u ékipazha vtoroi ékspeditsii "Saliut-4"

Medical examinations of the Salyut-4 crewmembers included bicycle ergometry tests. During the tests the heart rate and the time intervals of the left ventricle were measured. On the 46th flight day the arterial pressure, cardiac output and peripheral resistance were also determined. In the course of the 63-day flight responses to the 5 min workload of 2100-2200 kgm did not differ essentially from the preflight level, and did not increase with the flight time. Circulation changes noted in zero-g and upon return to I g were similar and can be accounted for by a reduction of the circulating blood volume. Inflight during the first minutes after the workload more marked changes in the cardiac output and cycle were detected. This can be attributed to a relatively stronger effect of blood pooling in working muscles on the venous return of the blood. On the 3rd postflight day the arterial pressure and the velocity of the aortal propagation of the pulse wave were higher.