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. 2021 May 28;12:685473. doi: 10.3389/fphys.2021.685473

TABLE 1.

All recorded parameters sorted by recordings before (PRE) and at the end of head down tilt bed rest (HDT).

Parameter Pooled analysis (n = 24)
p-value
PRE Δ (HDT-PRE) HDT
Aortic SBP (mmHg) 108 ± 12 0 ± 11 108 ± 8 0.935
Aortic DBP (mmHg) 72 ± 7 + 9 ± 7 81 ± 7 <0.001
SBP (mmHg) 125 ± 11 −1 ± 10 124 ± 9 0.652
DBP (mmHg) 70 ± 7 + 8 ± 7 78 ± 7 <0.001
Pulse pressure (mmHg) 55 ± 13 −9 ± 9 46 ± 9 <0.001
Heart rate (bpm) 62 ± 9 + 7 ± 9 69 ± 11 0.002
Stroke volume (ml) 97 ± 20 −14 ± 15 83 ± 15 0.001
Cardiac output (l/min) 5.9 ± 0.9 −0.3 ± 0.8 5.6 ± 1.1 0.265
PATArm (ms) 154 ± 15 + 9 ± 12 163 ± 17 0.002
PATFinger (ms) 205 ± 17 −1 ± 20 204 ± 18 0.898
PATThigh (ms) 209 ± 19 + 8 ± 15 217 ± 19 0.022
PATToe (ms) 353 ± 22 −3 ± 27 350 ± 24 0.957
ICT (ms) 49 ± 8 + 8 ± 13 57 ± 11 0.036
cPATArm (ms) 105 ± 14 + 2 ± 15 107 ± 15 0.354
cPATFinger (ms) 156 ± 17 −8 ± 19 148 ± 13 0.058
cPATThigh (ms) 160 ± 19 0 ± 16 160 ± 17 0.561
cPATToe (ms) 304 ± 18 + 11 ± 24 293 ± 22 0.188
bfPWV (m/s) 9.0 ± 1.2 + 0.2 ± 1.0 9.2 ± 1.3 0.864
AOC (ml/mmHg) 2.7 ± 0.6 + 0.4 ± 0.8 3.1 ± 0.6 0.094
AOD (10–3 mm Hg–1) 4.8 ± 2.0 −0.5 ± 2.4 4.3 ± 2.2 0.364
AOAmin (mm2) 481 ± 88 + 24 ± 53 505 ± 102 0.050

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 represented as mean values ± standard deviation from 24 subjects and statistical significance (p < 0.05) is indicated by p-values in bold.