Table 3.
Human subject cardiovascular and sympathoexcitatory responses to lower body negative pressure and handgrip exercise performed alone and in combination
| Before NTG | During NTG | |
|---|---|---|
| MAP (mmHg) | 84 ± 4 | 85 ± 4 |
| LBNP alone | −1 ± 1 | −1 ± 1 |
| HG alone | +5 ± 1 | +5 ± 1 |
| LBNP during HG | +3 ± 1 | +2 ± 1 |
| HR (beats min−1) | 60 ± 1 | 60 ± 3 |
| LBNP alone | +6 ± 1 | +6 ± 2 |
| HG alone | +9 ± 2 | +6 ± 1 |
| LBNP during HG | +5 ± 1 | +6 ± 2 |
| MSNA (bursts min−1) | 18 ± 5 | 17 ± 4 |
| LBNP alone | +11 ± 2 | +10 ± 2 |
| HG alone | +1 ± 1 | +0.4 ± 1 |
| LBNP during HG | +16 ± 3 | +12 ± 2 |
Values are means ± SEM. NTG, nitroglycerin; MAP, mean arterial pressure; HR, heart rate; MSNA, muscle sympathetic nerve activity; LBNP, lower body negative pressure; HG, handgrip. MAP and HR, n = 9; MSNA, n = 6.