Table 5.
Hysteresis of the SBRS and beat-to-beat blood pressure analysis
| Baseline | Post A | Post B | P (all) | |
|---|---|---|---|---|
| SBRS-slope | ||||
| SBRSrise-BI | −3.2 ± 0.6 | −2.9 ± 0.2 | −3.5 ± 0.7 | 0.70 |
| SBRSfall-BI | −2.9 ± 0.7 | −4.1 ± 0.7 | −3.8 ± 0.6 | 0.34 |
| P (rising vs. falling) | 0.56 | 0.15 | 0.68 | |
| SBRSrise-total MSNA | −0.8 ± 0.2 | −1.4 ± 0.1* | −1.6 ± 0.3* | <0.01 |
| SBRSfall-total MSNA | −0.7 ± 0.2 | −1.1 ± 0.2 | −1.4 ± 0.1* | <0.01 |
| P (rising vs. falling) | 0.16 | 0.26 | 0.41 |
Data are presented as means ± SE; n = 10 subjects. BI, burst incidence; BMI, body mass index; DBP, diastolic blood pressure; MSNA, muscle sympathetic nerve activity; SBRS, sympathetic baroreflex sensitivity; SBRSfall, SBRS comprised of DBP falling beats; SBRSrise, SBRS comprised of DBP rising beats; P (all): P value for the effect of time on whole trial by linear mixed effects model. *P < 0.05 compared with baseline by linear mixed-effects model (covariate; age, BMI, and DBP). P (rising vs. falling); P value between SBRSrise and SBRSfall was evaluated by paired t test.