Table 5.
Changes from the baseline during heat stress
| CHF | Aged | Young | P | |
|---|---|---|---|---|
| ΔSBP, mmHg | −8.4 ± 2.7 | −5.0 ± 2.5 | −4.0 ± 2.0 | 0.381 |
| ΔDBP, mmHg | −8.9 ± 1.5 | −4.3 ± 1.8 | −8.1 ± 1.5 | 0.127 |
| ΔMAP mmHg | −8.8 ± 1.8 | −4.6 ± 1.8 | −6.7 ± 1.3 | 0.214 |
| ΔHR, beats/min | 8.3 ± 2.7* | 13.8 ± 1.4* | 25.2 ± 4.3 | 0.002 |
| ΔMSNA, BR | 4.2 ± 2.0*† | 12.8 ± 1.7 | 12.0 ± 2.7 | 0.025 |
| ΔMSNA, BI | 0.9 ± 2.4* | 7.1 ± 2.0 | 7.5 ± 3.3 | 0.029 |
| ΔMSNA, total | 67 ± 72*† | 291 ± 35 | 280 ± 74 | 0.031 |
| ΔSkBFarm, % | 127 ± 39*† | 445 ± 45 | 581 ± 102 | <0.001 |
| ΔCVCarm, % | 151 ± 41*† | 480 ± 55 | 653 ± 122 | <0.001 |
| ΔTsk, °C | 4.2 ± 0.2 | 4.1 ± 0.2 | 4.1 ± 0.2 | 0.952 |
| ΔTcore, °C | 0.56 ± 0.04 | 0.60 ± 0.05 | 0.53 ± 0.05 | 0.569 |
| ΔTbody, °C | 0.9 ± 0.1 | 0.9 ± 0.1 | 0.9 ± 0.1 | 0.614 |
| ΔSR, mg·cm−2·min | 0.365 ± 0.080* | 0.453 ± 0.088 | 0.847 ± 0.104 | 0.005 |
Values are means ± SE. Units for MSNA: BR, bursts/min; BI, bursts/100 beats. Total, U/min.
*
P < 0.05 vs. young control subjects.
†
P < 0.05 vs. age-matched control subjects.