Table 5.
Hemodynamic variables and MSNA during handgrip trail
| Pre-RMHE | Post-RMHE | Post-1wk | P | |
|---|---|---|---|---|
| MAP, mmHg | ||||
| Base | 98 ± 3 | 95 ± 2 | 98 ± 2 | 0.933 |
| HG | 117 ± 4* | 116 ± 5* | 116 ± 4* | <0.001 |
| PECO | 110 ± 4* | 110 ± 4* | 109 ± 3* | 0.904 |
| HR, beats/min | ||||
| Base | 65 ± 2 | 60 ± 2c | 59 ± 2d | 0.009 |
| HG | 75 ± 2* | 69 ± 2*b | 70 ± 1*d | <0.001 |
| PECO | 65 ± 2^ | 61 ± 2^d | 61 ± 2^ | 0.929 |
| MSNA BR, bursts/min | ||||
| Base | 31.0 ± 2.3 | 24.8 ± 3.1 | 24.1 ± 3.7 | <0.001 |
| HG | 47.4 ± 3.1* | 39.1 ± 4.6*a | 35.6 ± 4.2*b | <0.001 |
| PECO | 44.0 ± 3.1* | 34.5 ± 3.9*a | 32.7 ± 4.0*a | 0.267 |
| MSNA BI, bursts/100 beats | ||||
| Base | 48.0 ± 3.2 | 42.3 ± 5.8 | 41.0 ± 6.3 | 0.045 |
| HG | 63.6 ± 3.8* | 56.5 ± 6.8* | 51.2 ± 6.2*d | <0.001 |
| PECO | 68.3 ± 4.7* | 57.3 ± 6.6*d | 54.6 ± 7.2*c | 0.447 |
BI, burst incidence; BR, burst rate; HG, handgrip; MSNA, muscle sympathetic nerve activity PECO, postexercise circulatory occlusion; RMHE, repeated moderate heat exposure. P: 3 P values for the factors in two-way ANOVA (up to down): Visit (i.e., effects of RMHE), Stress (i.e., handgrip), Interaction. Subject number: n = 9 for Pre and Post, n = 8 for Post-1wk.
Post hoc: within visit: *P < 0.05 vs. Base; ^P < 0.05 PECO vs. HG. Between visits: vs. Pre-RMHE aP < 0.001; b0.001 < P < 0.01; c0.01 < P < 0.02; d0.02 < P < 0.05.