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[Central and regional hemodynamics in long space flights]
Kosmicheskaia Biologiia I Aviakosmicheskaia Meditsina
|November 1, 1989
Summary
Spaceflight alters circulation, affecting regional blood flow and vessel tone. The cardiovascular system shows adaptability even during long-duration missions up to 237 days.
Area of Science:
- Cardiovascular physiology
- Space medicine
- Human physiology
Background:
- Understanding cardiovascular adaptation to spaceflight is crucial for astronaut health.
- Previous studies indicate significant hemodynamic shifts during microgravity exposure.
Purpose of the Study:
- To investigate central and regional hemodynamic changes during short-term and long-term space missions.
- To assess the cardiovascular system's adaptive capacity in response to prolonged spaceflight.
Main Methods:
- Tetrapolar rheography was employed to monitor hemodynamics.
- Measurements were taken during space missions aboard Salyut-6--Soyuz and Salyut-7--Soyuz.
- Exercise tests were conducted to evaluate cardiovascular response.
Main Results:
- Spaceflight induced variations in pulse blood filling and regional vascular tone (head, forearm, leg).
- Stroke volume and cardiac output showed insignificant changes during flight.
- Exercise response revealed a decreased contribution of stroke volume and increased heart rate to cardiac output.
Conclusions:
- Circulation changes during spaceflight are influenced by flight duration and vascular area position.
- The human cardiovascular system demonstrates adaptive capabilities, even in missions lasting up to 237 days.