Cardiovascular response to varying angle of head up tilt
| Tilt angle | HR (beats/min) | SBP (mm Hg) | DBP (mm Hg) | CO (l/min) | SV (ml) | FBF (%/min) |
| Rest | 62.2 (8.1) | 122.4 (22.6) | 69.4 (12.9) | 6.4 (1.9) | 104.8 (34.4) | 2.43 (1.34) |
| 45° | 69.1 (11.3) | 137 (23.2) | 83.5 (15.7) | 5.3 (1.6) | 75.8 (20.7) | 1.96 (1.22) |
| 60° | 72.7 (11.3) | 138.7 (19.5) | 88.1 (13.5) | 5.3 (1.6) | 72.6 (21.4) | 1.55 (0.81) |
| 75° | 73.9 (10.6) | 141.3 (26.2) | 88.2 (17.3) | 5.1 (1.6) | 68.9 (20.6) | 1.56 (0.74) |
| 90° | 75.2 (11.0) | 148.6 (25.5) | 92 (17.1) | 5.2 (1.7) | 69.5 (21.9) | 1.31 (0.86) |
| F(4,60) | 34.5 | 21.8 | 50.7 | 12.1 | 35.9 | 8.8 |
| p Value1-150 | <0.001 | <0.001 | <0.001 | 0.001 | <0.001 | 0.001 |
↵1-150 Comparison between supine and different angles of tilt made separately for each haemodynamic variable using single factor repeated measures analysis of variance.
CO, cardiac output; DBP, diastolic blood pressure; FBF, forearm blood flow; HR, heart rate; SBP, systolic blood pressure; SV, stroke volume.