Researchers led by cardiologist Benjamin Levine have published findings on how spaceflight affects astronauts’ cardiovascular health, with results appearing in the journal Circulation. The study involved 13 astronauts who conducted onboard echocardiograms—ultrasound imaging of the heart—during extended stays in space. The research examined how the heart adapts to microgravity over a six-month duration and how it responds when returning to Earth’s gravity and simulated Martian gravity conditions.
The findings indicate that initial changes to the astronauts’ heart structure and function during microgravity stabilized over the six-month period in space. Upon return to Earth and during exposure to conditions simulating Mars’s gravitational environment, which is three-eighths Earth’s gravity, the cardiovascular changes resolved without causing additional stress. Levine noted that no astronaut experienced a cardiovascular response more demanding than normal upright posture experienced before spaceflight. The research attributes this protective effect to the exercise regimens performed by the astronauts during their time in space.
Microgravity alters how blood flows to and from the heart and changes the shape of heart chamber walls, which affects how effectively the heart pumps. Exercise and strength training serve as countermeasures to these physiological changes. The study employed a novel approach by having astronauts perform their own echocardiograms with remote guidance from sonographers on the ground, allowing researchers to directly visualize cardiac adaptations rather than relying solely on blood pressure and heart rate measurements.
These findings have implications for future long-duration missions, including a planned Mars mission targeted for 2035, which would require two six-month journeys through microgravity surrounding an 18-month surface stay. Levine emphasized that the research demonstrates the importance of comprehensive exercise equipment for maintaining not only cardiovascular health but also muscle, bone, and cognitive function during extended spaceflight. The challenge moving forward involves determining which exercise devices can be included on spacecraft destined for Mars within constraints on mass, volume, and power requirements.
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