Table 2.

Total MSNA, calculated as the number of sympathetic spikes in a one-minute period, and mean blood pressure (mmHg), across the different phases of the respiratory cycle in the four groups studied

	YHC (n = 12)	OHC (n = 10)	HT (n = 13)	COPD (n = 15)
Expiratory MSNA	71 ± 11	71 ± 13	63 ± 10	161 ± 55
Inspiratory MSNA	86 ± 17	85 ± 15	77 ± 16	154 ± 49
Post-inspiratory MSNA	66 ± 9	68 ± 16	64 ± 12	153 ± 47
Expiratory mean BP	89.6 ± 5.7	93.1 ± 4.1	109.8 ± 3.1	82.3 ± 4.4
Inspiratory mean BP	88.8 ± 5.4	92.6 ± 4.1	109.8 ± 3.0	82.1 ± 4.4
Post-inspiratory mean BP	88.5 ± 5.7	93.3 ± 4.0	110.2 ± 3.1	82.7 ± 4.2

Values presented are mean ± SEM. There were no significant differences in MSNA or mean BP across the respiratory cycle in any group.