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Cardiovascular Effects of Exposure to Microgravity: A Literature Review
Alfredo Mendoza-Arzate1, Alejandro Hernández-Chávez2,3, Marco Antonio Robles-Rangel4
1Department of Cell and Tissue Biology, School of Medicine, Universidad Nacional Autónoma de México, Mexico City, Mexico.
Cardiology
|September 11, 2025
Summary
Spaceflight significantly impacts astronaut cardiovascular systems, causing changes in heart rate, blood volume, and vascular stiffness. Understanding these microgravity effects is crucial for mission safety and Earth-based cardiovascular research.
Area of Science:
- Aerospace Medicine
- Cardiovascular Physiology
- Human Physiology
Background:
- Human space exploration involves prolonged missions with significant physiological challenges.
- The space environment, including microgravity, poses risks to astronaut health.
- Cardiovascular system adaptations to spaceflight are a key area of study in aerospace medicine.
Purpose of the Study:
- To review the cardiovascular system's adaptive responses to microgravity during spaceflight.
- To summarize documented changes in cardiovascular dynamics, electrical conduction, and myocardial structure.
- To explore the implications of these changes for astronaut health and potential long-term cardiovascular events.
Main Methods:
- Literature review conducted from August 2024 to March 2025.
- Targeted searches using keywords: "astronaut," "spaceflight," "microgravity," "cardiovascular system."
- Identification and analysis of peer-reviewed studies on cardiovascular adaptation to spaceflight.
Main Results:
- Microgravity alters blood-flow dynamics, heart rate, and blood volume (central fluid shift, plasma volume reduction).
- Changes in endothelial function lead to increased vascular stiffness.
- Potential predisposition to orthostatic intolerance and arrhythmias observed.
Conclusions:
- Understanding cardiovascular adaptations to microgravity is vital for astronaut health and mission success.
- Research in this area provides insights into cardiovascular diseases on Earth.
- Findings enable the development of preventive strategies and inform novel therapeutic approaches.
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