Table 1.
Cardiovascular function and timing intervals through the three phases of bed rest.
| Variable | BDC12 | HDT01 | HDT 29 | HDT52 | R8 | |||||
|---|---|---|---|---|---|---|---|---|---|---|
| Campaign 1 | Campaign 2 | Campaign 1 | Campaign 2 | Campaign 1 | Campaign 2 | Campaign 1 | Campaign 2 | Campaign 1 | Campaign 2 | |
| HR (bpm) | 55 ± 4 | 64 ± 8† | 59 ± 11 | 55 ± 10 | 61 ± 13* | 63 ± 9* | 66 ± 15* | 67 ± 11* | 71 ± 14* | 67 ± 7*† |
| RR (ms) | 917 ± 67 | 1067 ± 133† | 983 ± 183 | 917 ± 167 | 1017 ± 217* | 1050 ± 150* | 1100 ± 250* | 1117 ± 183* | 1183 ± 233* | 1117 ± 117*† |
| SBP(mmHg) | 118 ± 13 | 125 ± 21† | 104 ± 11* | 120 ± 15*† | 123 ± 15 | 132 ± 18† | 113 ± 15 | 128 ± 19† | 116 ± 11 | 129 ± 21† |
| DBP (mmHg) | 63 ± 8 | 65 ± 7 | 54 ± 8* | 59 ± 7* | 66 ± 9 | 71 ± 12 | 64 ± 8 | 71 ± 12 | 62 ± 5 | 70 ± 13 |
| MAP (mmHg) | 83 ± 10 | 85 ± 12 | 71 ± 9 | 79 ± 10 | 85 ± 10 | 91 ± 13 | 80 ± 9 | 90 ± 14 | 80 ± 7 | 90 ± 15 |
| PTT (ms) | 189 ± 29 | 209 ± 38† | 123 ± 40* | 182 ± 60*† | 106 ± 29* | 208 ± 31† | 110 ± 26* | 205 ± 36† | 113 ± 17* | 179 ± 45*† |
| LVET(ms) | 337 ± 28 | 308 ± 35 | 344 ± 49* | 340 ± 21* | 320 ± 38 | 312 ± 20 | 308 ± 34* | 300 ± 20* | 310 ± 23* | 313 ± 15* |
Campaign groups were paired comparing HDBR phases to baseline BDC12. Further unpaired analysis was done to compare Campaign 1 and Campaign 2. Cardiovascular timing intervals were Values are split based on phase and further split based on campaign season. Campaign 1 coincides with the first season started in January and Campaign 2 coincides with the second season started in September. * Denotes significant differences compared to BDC12 and † denotes significance between campaigns at each test day (Two-way ANOVA, p < 0.05).