TABLE 2.

Mean ± standard deviation for resting CBF measures obtained from MRI data (gray matter cerebral perfusion and transit times) and TCD data (MCAv and CVCi). Measures are shown for all participants followed by groups separated into younger and older; younger fit and unfit; and older fit and unfit

	All participants n = 33	By age groups		By age and fitness groups
		Younger n= 1	Older n= 16	Younger fit n= 9	Younger unfit n = 10	Older fit n = 9	Older unfit n = 7
MRI: GM cerebral perfusion (mL·100g−1·min−1)	65.9 ± 15.0	69.3 ± 12.9	61.2 ± 16.8	72.2 ± 8.55	67.2 ± 15.3	61.6 ± 16.3	60.8 ± 19.1
MRI: GM transit time (s)	0.70 ± 0.46	0.67 ± 0.34	0.73 ± 0.44 **	0.70 ± 0.02	0.65 ± 0.27 **	0.72 ± 0.04	0.73 ± 0.05
TCD: MCA velocity (cm·s−1)	63.1 ± 16.2	69.2 ± 13.6	54.9 ± 16.2 **	61.1 ± 7.14	74.7 ± 14.4 *	60.6 ± 14.1	46.4 ± 16.6 t
TCD: CVCi (cm·s−1 · mm Hg−1)	0.80 ± 0.23	0.89 ± 0.19	0.67 ± 0.23 **	0.81 ± 0.17	0.94 ± 0.20	0.77 ± 0.18	0.48 ± 0.19 *

Values represent mean ± standard deviation. Age groups were defined as younger (18–40 years) and older (50–80 years). Significant age/fitness effects shown from ANOVA (different from younger group/ fit group)

^t Shows a trend toward significance: 0.05 < p ≤ 0.10.

^* p ≤ .05

^** p ≤ .01