Table 4.

Estimated model parameters for cerebral blood flow response to hypercapnia during control, l-NMMA, and phenylephrine infusion

Day	Gon	F1	τon	Td	Goff	F2	τoff
Control	2.55 ± 0.71	56.87 ± 9.52	42.05 ± 22.41	5.94 ± 0.67	2.99 ± 0.92	52.30 ± 7.06	6.68 ± 1.57
l-NMMA	2.37 ± 0.64	57.24 ± 9.06	34.29 ± 21.34	6.07 ± 2.67	2.56 ± 0.82†	55.16 ± 8.10	6.58 ± 2.77
Phenylephrine	2.50 ± 0.56	58.71 ± 9.12	15.06 ± 16.77	6.26 ± 1.06	3.03 ± 0.89	53.95 ± 4.38	6.49 ± 2.58

Values are means ±s.d. Abbreviations: G_on and G_off, gain terms for the on- and off-responses (cm s⁻¹ Torr⁻¹); F₁ and F₂, before and after hypercapnia (cm s⁻¹); τ_on and τ_off, time constant for the on- and off-responses (s); T_d, time delay.

^†denotes a significant difference from control at P < 0.05.