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Average changes in δ44/42Ca from baseline values for all subjects as a function of day during our bed rest study. The baseline value is represented by the average δ44/42Ca of all subjects during the BDC period (BDC-6 and BDC-2). The phases of the study are: BDC: pre-bed rest baseline data collection, HDT: head-down-tilt bed rest, R1: inpatient regeneration and R2: outpatient regeneration (follow-up examinations).
