Table 3.

Baroregulation in Aged Pigeons (≥8 years; n = 22)

ABP Range	Pigeons per ABP Range	Mean Samples per Pigeon	Mean ABP ± SEM per ABP Range	Mean ChBF ± SEM per ABP Range	Mean ABP per ABP Range as % of Basal ABP	Mean ChBF per ABP Range as % of Basal ChBF	ChBF Resistance per ABP Range as % of Basal
140–150	2	4.0	141.9 ± 0.42	47.3 ± 41.68	150.4%	125.1%	120.3%
130–140	2	6.0	132.8 ± 0.22	52.8 ± 24.62	140.8%	139.7%	100.8%
120–130	6	7.0	124.7 ± 1.25	45.3 ± 5.67	132.2%	119.7%	110.4%
110–120	6	5.8	114.3 ± 1.25	41.2 ± 4.78	121.2%	108.9%	111.2%
100–109	8	8.4	105.0 ± 0.87	29.4 ± 5.00	111.2%	77.8%	143.0%
90–100	12	12.8	94.0 ± 0.64	24.0 ± 3.58	99.7%	63.4%	157.3%
85–90	12	10.9	87.3 ± 0.33	27.0 ± 2.74	92.5%	71.3%	129.6%
80–85	12	11.6	82.8 ± 0.23	26.2 ± 2.11	87.7%	69.1%	126.9%
75–80	15	16.9	77.2 ± 0.21	25.3 ± 2.18	81.8%	66.7%	122.6%
70–75	14	10.8	72.5 ± 0.29	26.3 ± 2.31	76.9%	69.4%	110.8%
65–70	13	7.1	67.5 ± 0.36	30.5 ± 2.37	71.6%	80.6%	88.7%
60–65	9	14.7	62.3 ± 0.24	26.7 ± 1.94	66.1%	70.7%	93.5%
55–60	10	13.7	56.6 ± 0.58	26.4 ± 2.07	59.9%	69.8%	85.8%
50–55	8	11.6	52.4 ± 0.94	26.1 ± 2.77	55.5%	68.9%	80.6%
45–50	3	5.0	48.0 ± 1.30	23.9 ± 0.95	50.9%	63.1%	80.7%
40–45	3	6.8	43.6 ± 0.83	21.0 ± 6.05	46.2%	55.5%	83.2%
35–40	2	2.0	36.9 ± 0.34	20.5 ± 11.03	39.1%	54.3%	72.1%
30–35	1	1.0	31.5	12.2	33.4%	32.2%	103.9%
25–30	1	1.0	27.1	9.0	28.7%	24.3%	120.8%
20–25	1	1.0	21.9	12.2	23.2%	32.8%	72.0%

Tabulation of ChBF during fluctuation in ABP in the 22 normal aged pigeons (≥8 years old) analyzed. As can be seen, ChBF values linearly followed ABP increases at ABP from 90 to 140 mm Hg, and were maintained at approximately 65% of basal over the 50 to 90 mm Hg range. Choroidal resistance changes with ABP variation reflected these ChBF trends, with resistance not increasing linearly with ABP > 90, and resistance being high, but showing a linear decline with ABP from 50 to 90 mm Hg.