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the claim

Astronauts can live in microgravity for over a year, though they lose bone density and muscle mass.

the verdict
INSUFFICIENT LEANING
Recorded sources
5 sources for · 0 against

Counts group repeated records of the same source within each side. They do not measure evidence strength or source independence.

Is it true that astronauts can live in microgravity for over a year, though they lose bone density and muscle mass?

Unclear. Several sources confirm that microgravity causes bone density and muscle mass loss in astronauts, and NASA describes studying crew members on missions up to one year. None of the retrieved items establishes that astronauts can live in microgravity for over a year.

Verdict: PARTIAL LEAN · 5 sources for, 0 against · Last checked

The private library was unavailable for some searches in this check. Missing library results are not evidence against the claim.

Evidence for · 5
Disuse-Induced Muscle Atrophy and Muscle Weakness From Hospitalization to Spaceflight: Exercise Succeeds in Prevention and Treatment-A Meta-Analysis.
2026
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CS, P., C, F., R, D., AS, R., RU, N., NH, H., JC, R., M, S., & FS, L. (2026). Disuse-Induced Muscle Atrophy and Muscle Weakness From Hospitalization to Spaceflight: Exercise Succeeds in Prevention and Treatment-A Meta-Analysis.. doi.org. https://doi.org/10.1002/jcsm.70259

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More for · 4
Counteracting Bone and Muscle Loss in Microgravity - NASA
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Counteracting Bone and Muscle Loss in Microgravity - NASA. (n.d.). nasa.gov. https://www.nasa.gov/missions/station/iss-research/counteracting-bone-and-muscle-loss-in-microgravity/

Evaluation of Augmented Reality and Wearable Sensors to Assess Neurovestibular and Sensorimotor Performance in Astronauts for Extravehicular Activity Readiness
2024
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Weiss, H. M. (2024). Evaluation of Augmented Reality and Wearable Sensors to Assess Neurovestibular and Sensorimotor Performance in Astronauts for Extravehicular Activity Readiness. eric.ed.gov. https://eric.ed.gov/?id=ED658054

Spaceflight on the ISS changed the skeletal muscle proteome of two astronauts
2024
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Murgia, M., Rittweger, J., Reggiani, C., Bottinelli, R., Mann, M., Schiaffino, S., & Narici, M. V. (2024). Spaceflight on the ISS changed the skeletal muscle proteome of two astronauts. doi.org. https://doi.org/10.1038/s41526-024-00406-3

Microgravity- induced organ and system-level deconditioning: a network physiology perspective.
2026
Get citation
R, N. & RR, G. (2026). Microgravity- induced organ and system-level deconditioning: a network physiology perspective.. doi.org. https://doi.org/10.3389/fnetp.2026.1931834

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