Astronaut Hearts Adapt to Martian Gravity, Study Finds

Researchers tracked 13 astronauts over months of weightlessness and found their hearts adapted to microgravity. When exposed to simulated Martian gravity, the hearts performed without major issues. Regular exercise during flight appeared to support this adaptation. The study suggests that the human cardiovascular system may be more resilient to the stresses of a Mars mission than previously thought. This finding reduces concerns about heart failure during long‑duration spaceflight and supports the feasibility of crewed missions to the Red Planet. The data also provide a baseline for monitoring cardiac health on future missions and for designing exercise protocols to maintain heart function in space.