Table 2.

Arterial stiffness indices in young and old individuals at BL and during the CPT

			P Value
	Young	Old	Age	Phase	Age × phase
CCA β-stiffness
BL	5.5 ± 1.1	7.6 ± 2.3	0.001	0.980	0.843
CPT	5.6 ± 1.1	7.5 ± 1.9
ICA β-stiffness
BL	8.5 ± 4.2	6.7 ± 2.6	0.676	0.635	0.419
CPT	8.0 ± 4.9	8.6 ± 2.2
CCA elastic modulus, mmHg
BL	555.9 ± 129.5	796.3 ± 198.2	<0.001	0.131	0.910
CPT	636.9 ± 126.1	890.2 ± 219.1
ICA elastic modulus, mmHg
BL	846.6 ± 384.4	698.4 ± 264.9	0.879	0.227	0.383
CPT	896.5 ± 496.2	1,000.8 ± 269.5
CCA arterial compliance, cm/mmHg
BL	0.012 ± 0.003	0.010 ± 0.003	0.023	0.191	0.998
CPT	0.011 ± 0.002	0.009 ± 0.002
ICA arterial compliance, cm/mmHg
BL	0.008 ± 0.003	0.011 ± 0.006	0.499	0.856	0.256
CPT	0.009 ± 0.005	0.009 ± 0.005
CCA arterial distensibility, mmHg
BL	0.002 ± 0.000	0.001 ± 0.001	0.002	0.234	0.947
CPT	0.002 ± 0.000	0.001 ± 0.000
ICA arterial distensibility, mmHg
BL	0.002 ± 0.001	0.002 ± 0.001	0.467	0.562	0.343
CPT	0.003 ± 0.006	0.001 ± 0.000

Values are means ± SD. BL, baseline; CPT, cold pressure test; CCA, common carotid artery; ICA, internal carotid artery; MCA, middle cerebral artery; PCA, posterior cerebral artery; P values represent 2-way repeated ANOVA results (age: young and old; phase: BL, CPT1, CPT2, CPT3, RE1, RE2, and RE3).