TABLE 4.
All parameters recorded before (PRE) and at the end of head down tilt bed rest (HDT).
| Parameter | Men (n = 16) |
Women (n = 8) |
p-values |
|||
| PRE | HDT | PRE | HDT | Main effect | Interaction | |
| Aortic SBP (mmHg) | 111 ± 12 | 111 ± 7 | 102 ± 8 | 103 ± 5 | 0.017 | 0.439 |
| Aortic DBP (mmHg) | 70 ± 8 | 81 ± 8 | 75 ± 5 | 80 ± 4 | 0.394 | 0.109 |
| SBP (mmHg) | 129 ± 10 | 128 ± 7 | 117 ± 8 | 116 ± 6 | 0.001 | 0.389 |
| DBP (mmHg) | 68 ± 8 | 79 ± 8 | 73 ± 5 | 78 ± 4 | 0.278 | 0.157 |
| Pulse pressure (mmHg) | 61 ± 11 | 50 ± 8 | 44 ± 4 | 38 ± 3 | <0.001 | 0.071 |
| Heart rate (bpm) | 58 ± 5 | 66 ± 11 | 70 ± 9 | 74 ± 12 | 0.022 | 0.614 |
| Stroke volume (ml) | 107 ± 17 | 89 ± 13 | 78 ± 12 | 71 ± 11 | 0.001 | 0.289 |
| Cardiac output (l/min) | 6.1 ± 1.0 | 5.9 ± 1.1 | 5.4 ± 0.5 | 5.2 ± 1.0 | 0.243 | 0.726 |
| PATArm (ms) | 155 ± 17 | 167 ± 19 | 15 ± 19 | 155 ± 10 | 0.274 | 0.090 |
| PATFinger (ms) | 209 ± 20 | 208 ± 18 | 199 ± 11 | 198 ± 15 | 0.257 | 0.981 |
| PATThigh (ms) | 215 ± 20 | 223 ± 19 | 199 ± 12 | 205 ± 17 | 0.050 | 0.732 |
| PATToe (ms) | 353 ± 23 | 352 ± 25 | 350 ± 22 | 346 ± 24 | 0.181 | 0.910 |
| ICT (ms) | 48 ± 7 | 58 ± 11 | 52 ± 7 | 54 ± 12 | 0.958 | 0.328 |
| cPATArm (ms) | 108 ± 16 | 109 ± 17 | 98 ± 7 | 101 ± 7 | 0.177 | 0.588 |
| cPATFinger (ms) | 161 ± 18 | 150 ± 14 | 147 ± 11 | 144 ± 9 | 0.131 | 0.438 |
| cPATThigh (ms) | 167 ± 19 | 164 ± 17 | 147 ± 12 | 152 ± 16 | 0.024 | 0.567 |
| cPATToe (ms) | 306 ± 18 | 294 ± 24 | 298 ± 20 | 290 ± 20 | 0.115 | 0.405 |
| bfPWV (m/s) | 8.6 ± 0.6 | 9.0 ± 1.2 | 9.9 ± 1.6 | 9.7 ± 1.4 | 0.016 | 0.161 |
| AOC (ml/mmHg) | 2.7 ± 0.6 | 3.1 ± 0.6 | 2.9 ± 0.4 | 3.0 ± 0.4 | 0.588 | 0.304 |
| AOD (10–3 mm Hg–1) | 4.8 ± 2.0 | 4.4 ± 2.3 | 4.8 ± 2.1 | 4.1 ± 2.1 | 0.705 | 0.740 |
| AOAmin (mm2) | 486 ± 97 | 512 ± 112 | 471 ± 73 | 490 ± 82 | 0.384 | 0.879 |
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. Results are sorted by sex and represented as mean values ± standard deviation. Statistical significance (p < 0.05) for main effect (sex) and interaction (sex vs. bed rest) is indicated by bold p-values.