Table 2.
Physiological ‘reserve’ during tolerance to central hypovolemia expressed as change from baseline to pre-syncope.
| Men | Women | ||
|---|---|---|---|
| Change from baseline value | P value | ||
| HR (beats/min) | 47 ± 12 | 38 ± 10 | 0.20 |
| MAP (mmHg) | −31 ± 9 | −33 ± 8 | 0.45 |
| SAP (mmHg) | −54 ± 7 | −48 ± 8 | 0.29 |
| DAP (mmHg) | −18 ± 5 | −18 ± 7 | 0.78 |
| SV (mL) | −57 ± 8 | −41 ± 4 | 0.006 |
| Q (L/min) | −1.6 ± 0.7 | −1.4 ± 0.4 | 0.32 |
| TPR (mmHg/L/min) | 6.2 ± 3.9 | 9.2 ± 1.8 | 0.10 |
| RRIHF (Vagal Index) | 1229 ± 1118 | 1155 ± 769 | 0.44 |
| BRS | 16.4 ± 3.8 | 18.7 ± 5.3 | 0.53 |
| SAP-MSNA coherence (arbitrary units) | 0.05 ± 0.14 | −0.39 ± 0.28 | 0.03 |
| SAP LF (mmHg2) | 27.5 ± 19 | 16.2 ± 6 | 0.09 |
All values presented as mean (± 95% CI).