Orthostatic Intolerance Is Independent of the Degree of Autonomic Cardiovascular Adaptation after 60 Days of Head-Down Bed Rest

Figure 3

Changes in respiratory sinus arrhythmia (RSA) and LF power of BPV during HDBR in the fainters and the nonfainters. Nonfainters, the median values [25th, 75th percentiles] are shown as dots ; fainters. the absolute individuals values are shown as diamonds, ; BDC. 14 days before head-down bed rest; HDT2. the 2nd day of bed rest; HDT7. the 7th day of bed rest; HDT21. the 21st day of bed rest; HDT41. the 41st day of bed rest; HDT56. the 56th day of bed rest; . the 6th day during recovery; . the 12th day during recovery. and compared with controlled breathing data before HDBR.