Martian Gravity Thresholds: 0.67 g May Preserve Astronaut Muscles

An international study using mice aboard JAXA's centrifuge simulated Martian gravity (0.33 g, 0.67 g, and 1 g) and found that 0.33 g mitigates spaceflight-induced muscle loss while 0.67 g fully preserves muscle performance, suggesting partial gravity during Mars missions could help maintain astronauts' muscle health; researchers also identified 11 metabolites as potential biomarkers of physiological adaptation.