Table 2.
Mean ± SD values of ARI for sitting, standing and squat-stand maneuver.
| ARI | Sitting | Standing | SSM | P-value |
|---|---|---|---|---|
| ARI+D | 5.61 ± 1.58 | 5.70 ± 1.24 | 4.70 ± 1.11 | 0.001 |
| ARI−D | 4.31 ± 2.16 | 4.63 ± 1.92 | 3.31 ± 1.53 | 0.002 |
| ARIORIG | 5.03 ± 1.16 | 5.18 ± 1.13 | 4.00 ± 0.93 | <0.0001 |
| ARI+D–ARI−D | 1.29 ± 3.05 | 1.07 ± 2.45 | 1.38 ± 2.18 | 0.81 |
| ARI+D–ARIORIG | 0.58 ± 1.57 | 0.52 ± 1.29 | 0.70 ± 0.96 | 0.77 |
| ARIORIG–ARI−D | 0.72 ± 1.79 | 0.55 ± 1.34 | 0.69 ± 1.46 | 0.83 |
| ARIAVER | 4.96 ± 1.12 | 5.16 ± 1.06 | 4.01 ± 0.82 | <0.0001 |
| ARIAVER–ARIORIG | −0.072 ± 0.707 | −0.013 ± 0.484 | 0.006 ± 0.634 | 0.78 |
| correlationARIAVER–ARIORIG | 0.81# | 0.90# | 0.75# | – |
Values are mean ± SD. SSM: repetitive squat-stand maneuver; ARI: autoregulation index; ARI+D: ARI for the integrated positive derivative of mean arterial blood pressure (MAP); ARI−D: ARI for the integrated negative derivative of MAP; ARIORIG: ARI for the original MAP values; ARIAVER: intra-subject averaged values of ARI+D and ARI−D. P-values from one-way ANOVA for differences between sitting, standing and SSM; #p < 0.0001 with significant values in bold.