Table 4.
Hemodynamic variables and MSNA during cold pressor test
| Pre-RMHE | Post-RMHE | Post-1wk | P | |
|---|---|---|---|---|
| MAP, mmHg | ||||
| Base | 96 ± 2 | 96 ± 2 | 97 ± 2 | 0.501 |
| CPT | 117 ± 4* | 120 ± 4* | 117 ± 3* | <0.001 |
| 0.544 | ||||
| HR, beats/min | ||||
| Base | 64 ± 2 | 57 ± 2a | 60 ± 2 | <0.001 |
| CPT | 70 ± 2* | 66 ± 3 | 67 ± 2* | 0.006 |
| 0.551 | ||||
| MSNA BR, bursts/min | ||||
| Base | 29.0 ± 2.1 | 23.9 ± 3.1 | 25.6 ± 2.8 | 0.026 |
| CPT | 49.0 ± 4.2* | 41.6 ± 4.4*b | 41.7 ± 3.2*c | <0.001 |
| 0.273 | ||||
| MSNA BI, bursts/100 beats | ||||
| Base | 45.2 ± 2.9 | 42.4 ± 5.6 | 42.6 ± 4.8 | 0.449 |
| CPT | 70.3 ± 6.0* | 64.1 ± 7.9* | 63.6 ± 6.2* | <0.001 |
| 0.402 |
BI, burst incidence; BR, burst rate; CPT, cold pressor test; HR, heart rate; MAP, mean arterial pressure; MSNA, muscle sympathetic nerve activity; RMHE, repeated moderate heat exposure. P: P values for the factors in two-way repeated measures ANOVA (up to down): Visit (i.e., effects of RMHE), stress (i.e., CPT), Interaction. Subject number: n = 9 for Pre, n = 8 for Post and Post-1wk.
Post hoc: within visit *P < 0.05 vs. Base. Between visits: vs. Pre-RMHE, aP = 0.003; bP = 0.015; cP = 0.018.