Table 3. Time and frequency domain parameters in PRE and POST at REST and during STAND over MAP and MCBF variabilities.
| parameter | PRE | POST | ||
|---|---|---|---|---|
| REST | STAND | REST | STAND | |
| μMAP [mmHg] | 98.7±14.3 | 97.2±21.0 | 93.6±16.4 | 117.5±21.4 |
| σ2MAP [mmHg2] | 14.65±9.61 | 22.32±22.58 | 12.00±6.09 | 18.40±7.25 |
| VLFaMAP [mmHg2] | 4.88±7.54 | 0.60±1.62 | 1.45±3.07 | 2.84±5.68 |
| VLF%MAP | 27.91±38.14 | 5.86±14.83 | 11.16±21.19 | 17.20±34.40 |
| LFaMAP [mmHg2] | 2.91±2.71 | 5.54±6.60 | 1.66±1.32 | 1.10±2.21 |
| LF%MAP | 19.82±12.81 | 21.09±15.01 | 14.93±10.71 | 7.65±15.30 |
| HFaMAP [mmHg2] | 1.74±1.50 | 1.63±1.90 | 3.26±3.16 | 6.82±6.97* |
| HF%MAP | 12.66±8.49 | 8.41±4.04 | 25.45±13.93* | 32.04±18.85* |
| μMCBF [cm·s-1] | 44.39±15.34 | 36.15±13.79 | 46.38±13.90 | 30.00±9.15 |
| σ2MCBF [cm2·s-2] | 11.49±15.27 | 12.51±13.61 | 11.52±7.31 | 22.42±27.55 |
| VLFaMCBF [cm2·s-2] | 4.18±8.57 | 1.09±2.02 | 2.57±4.96 | 1.12±2.23 |
| VLF%MCBF | 21.99±30.60 | 12.21±22.61 | 17.64±34.37 | 1.77±3.54 |
| LFaMCBF [cm2·s-2] | 1.93±3.25 | 3.71±7.93 | 2.90±5.97 | 3.81±6.40 |
| LF%MCBF | 17.63±12.41 | 19.56±17.54 | 16.45±30.70 | 12.63±11.58 |
| HFaMCBF [cm2·s-2] | 1.95±3.07 | 2.92±2.91 | 1.62±1.31 | 3.17±4.81 |
| HF%MCBF | 13.49±7.74 | 24.89±10.39 | 12.97±9.74 | 11.92±9.16 |
LF = low frequency; VLF = very LF; HF = high frequency; MAP = mean arterial pressure; μMAP = MAP mean; σ2MAP = MAP variance; VLFaMAP and VLF%MAP = VLF power of MAP expressed in absolute and percent units; LFaMAP and LF%MAP = LF power of MAP expressed in absolute and percent units; HFaMAP and HF%MAP = HF power of MAP expressed in absolute and percent units; MCBF = mean cerebral blood flow; μMCBF = MCBF mean; σ2MCBF = MCBF variance; VLFaMCBF and VLF%MCBF = VLF power of MCBF expressed in absolute and percent units; LFaMCBF and LF%MCBF = LF power of MCBF expressed in absolute and percent units; HFaMCBF and HF%MCBF = HF power of MCBF expressed in absolute and percent units; PRE = 1 day before surgery; POST = within 7 days after surgery; REST = at rest in supine position; STAND = during active standing. Results are reported as mean±standard deviation. The symbol * indicates p<0.05 versus PRE within the same experimental condition (i.e. REST or STAND).