TABLE 2.
All parameters recorded before (PRE) and at the end of head down tilt bed rest (HDT), sorted by intervention: control (Ctr), continuous artificial gravity (cAG) and intermittent artificial gravity (iAG).
| Parameter | Ctr (n = 8, 2 women) |
cAG (n = 8, 3 women) |
iAG (n = 8, 3 women) |
p-values |
||||
| PRE | HDT | PRE | HDT | PRE | HDT | Main effect | Interaction | |
| Aortic SBP (mmHg) | 112 ± 10 | 113 ± 8 | 109 ± 17 | 108 ± 7 | 104 ± 7 | 105 ± 5 | 0.116 | 0.463 |
| Aortic DBP (mmHg) | 73 ± 9 | 82 ± 10 | 72 ± 7 | 81 ± 5 | 70 ± 7 | 79 ± 3 | 0.680 | 0.803 |
| SBP (mmHg) | 125 ± 8 | 129 ± 8 | 127 ± 15 | 124 ± 11 | 123 ± 10 | 120 ± 6 | 0.542 | 0.050 |
| DBP (mmHg) | 71 ± 8 | 80 ± 10 | 70 ± 6 | 79 ± 5 | 68 ± 8 | 76 ± 3 | 0.532 | 0.921 |
| Pulse pressure (mmHg) | 54 ± 8 | 49 ± 10 | 57 ± 15 | 45 ± 9 | 55 ± 15 | 44 ± 7 | 0.773 | 0.112 |
| Heart rate (bpm) | 62 ± 8 | 70 ± 10 | 63 ± 12 | 71 ± 15 | 62 ± 7 | 65 ± 10 | 0.710 | 0.162 |
| Stroke volume (ml) | 99 ± 27 | 84 ± 12 | 94 ± 21 | 78 ± 11 | 99 ± 14 | 87 ± 20 | 0.683 | 0.712 |
| Cardiac output (l/min) | 6.0 ± 1.3 | 5.9 ± 0.9 | 5.7 ± 0.7 | 5.5 ± 1.0 | 6.0 ± 0.8 | 5.6 ± 1.5 | 0.859 | 0.706 |
| PATArm (ms) | 160 ± 14 | 173 ± 19 | 153 ± 14 | 160 ± 14 | 149 ± 16 | 156 ± 15 | 0.125 | 0.993 |
| PATFinger (ms) | 209 ± 15 | 214 ± 17 | 208 ± 22 | 198 ± 19 | 199 ± 15 | 201 ± 13 | 0.390 | 0.582 |
| PATThigh (ms) | 215 ± 14 | 222 ± 17 | 205 ± 19 | 208 ± 18 | 208 ± 24 | 221 ± 22 | 0.188 | 0.376 |
| PATToe (ms) | 349 ± 17 | 354 ± 29 | 360 ± 26 | 347 ± 26 | 349 ± 23 | 350 ± 21 | 0.716 | 0.443 |
| ICT (ms) | 50 ± 10 | 63 ± 12 | 50 ± 7 | 54 ± 11 | 47 ± 6 | 54 ± 9 | 0.307 | 0.445 |
| cPATArm (ms) | 110 ± 14 | 110 ± 18 | 103 ± 15 | 106 ± 14 | 101 ± 14 | 103 ± 12 | 0.218 | 0.410 |
| cPATFinger (ms) | 159 ± 16 | 151 ± 11 | 158 ± 22 | 145 ± 18 | 151 ± 10 | 147 ± 9 | 0.811 | 0.447 |
| cPATThigh (ms) | 165 ± 16 | 160 ± 11 | 155 ± 20 | 154 ± 16 | 161 ± 22 | 167 ± 22 | 0.343 | 0.063 |
| cPATToe (ms) | 300 ± 12 | 291 ± 25 | 310 ± 21 | 290 ± 23 | 301 ± 21 | 297 ± 22 | 0.555 | 0.405 |
| bfPWV (m/s) | 9.0 ± 1.1 | 9.2 ± 1.5 | 9.1 ± 1.0 | 9.5 ± 0.8 | 9.0 ± 1.5 | 9.0 ± 1.6 | 0.664 | 0.875 |
| AOC (ml/mmHg) | 2.6 ± 0.6 | 2.8 ± 0.2 | 2.8 ± 0.7 | 3.0 ± 0.5 | 2.9 ± 0.3 | 3.4 ± 0.7 | 0.176 | 0.386 |
| AOD (10–3 mm Hg–1) | 5.2 ± 2.4 | 4.4 ± 2.9 | 4.7 ± 2.1 | 4.5 ± 1.9 | 4.6 ± 1.7 | 4.1 ± 1.9 | 0.465 | 0.865 |
| AOAmin (mm2) | 496 ± 70 | 504 ± 107 | 456 ± 79 | 487 ± 52 | 492 ± 116 | 522 ± 138 | 0.630 | 0.317 |
Aortic SBP and aortic DBP, aortic systolic and diastolic blood pressure; SBP and DBP, brachial systolic and diastolic blood pressure; PAT, pulse wave arrival time; ICT, isovolumetric contraction time; cPAT, PAT corrected for ICT; bfPWV, brachial-femoral pulse wave velocity; AOC, aortic compliance; AOD, aortic distensibility; AOAmin, minimum aortic area. Each parameter is represented as mean value ± standard deviation together with p-values for main effects (intervention) and interaction (intervention vs. bed rest).