Table 1.

Transfer functions of the baroreflex neural arc (from CSP to SNA) in open-loop and closed-loop-spontaneous conditions

	Open-loop TF (Hn-open, CSP to SNA)	Closed-loop-spontaneous TF (Hn-closed-spon, CSP [= AP] to SNA)
Gain (a.u. mmHg−1)
0.01 Hz	1.2 ± 0.2	1.8 ± 0.1*
0.1 Hz	2.0 ± 0.3	5.3 ± 2.8*
0.3 Hz	2.6 ± 0.3	14.6 ± 5.7*
Phase (rad)
0.01 Hz	−2.7 ± 0.2	−5.4 ± 0.4*
0.1 Hz	−3.0 ± 0.1	−3.1 ± 0.4
0.3 Hz	−3.7 ± 0.1	−2.6 ± 0.11*
Coherence
0.01 Hz	0.8 ± 0.1	0.8 ± 0.2
0.1 Hz	0.9 ± 0.1	0.6 ± 0.2*
0.3 Hz	0.9 ± 0.1	0.4 ± 0.3*
Slope (dB per decade)
0.01 Hz to 0.3 Hz	4.7 ± 0.4	12.1 ± 6.1*
Step response
Initial response (a.u.)	−2.4 ± 0.2	Oscillating response
Steady-state level (a.u.)	−1.2 ± 0.2

Values are mean ± SD (n = 10).

^*P < 0.05; open-loop vs. closed-loop-spontaneous conditions. TF, transfer function.