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Baseline data collection (BDC) was carried out during a 14‐day ambulatory phase in standard ambient air. Participants then underwent 30 days of strict 6° head down‐tilt bed rest with 0.5% ambient carbon dioxide (HDBR+CO2). The bed rest intervention was followed by a 14‐day ambulatory recovery (R) phase in standard ambient air. Resting‐state fMRI scans were acquired on sessions BDC‐13, BDC‐7, HDT7, HDT29, R5, R12
