Astronauts’ hearts just passed a surprising test for Mars

A new study tracking 13 astronauts suggests that the human heart may be surprisingly well equipped for a journey to Mars, especially with regular exercise during spaceflight. Researchers found that astronauts’ hearts adapted to months of weightlessness and handled simulated Martian gravity without major problems, offering new hope for future missions to the Red Planet. Astronauts’ hearts just passed a surprising test for Mars.

Com A journey to Mars may be less challenging for the human heart than scientists once feared. A new study suggests that astronauts can adapt remarkably well to months of weightlessness, offering encouraging evidence that humans could endure the long trip to the Red Planet and function under its weaker gravity. Researchers from Northwestern Medicine, UT Southwestern, and UT Houston monitored the hearts of 13 astronauts who spent about six months aboard the International Space Station.

Their findings showed that although spaceflight initially affected heart performance, the astronauts gradually adapted, with intensive daily exercise playing an important role in maintaining their cardiovascular health. One of NASA’s major concerns about sending humans to Mars is how astronauts’ hearts and circulatory systems will respond when they leave the weightless conditions of spaceflight (known as microgravity) and encounter Martian gravity, which is only about one-third as strong as Earth’s. Encouragingly, the researchers found that the astronauts showed no significant signs of cardiovascular strain when exposed to simulated Martian gravity after returning to Earth.