Table 1.

Participants’ Characteristics Measured at the Follow-up Visit at Time of fMRI (n = 30)

	Successful Aging Group (n = 10)	Physical Activity Group (n = 20)	p Value of Group Comparison
Age, y, M (SD)	81.45 (2.77)	80.8 (3.95)	.5
Male, n (%)	3 (30.0)	5 (25.0)	.4
Education, completed high school or equivalent, n (%)	4 (40.0)	9 (45.0)	.5
Mini-mental score, M (SD)	27.5 (2.2)	27.9 (1.8)	.8
Self-reported rating of very good health, n (%)	4 (40)	8 (40)	.9
Brain volume, mm3, M (SD)*	1296.5 (167.5)	1350.7 (94.7)	.1
Atrophy index (gray matter/CSF volume), M (SD)*	1.4 (0.1)	1.4 (0.1)	.9
White matter hyperintensities, % of total white matter volume, M (SD)*	0.35 (0.3)	0.33 (0.2)	.8
DSST during the fMRI task, accuracy, M (SD)†	66 (0.27)	82 (0.12)	.02
DSST during the fMRI task, response time, ms, M (SD)‡	3086.5 (364.8)	2680.2 (534.7)	.01

Notes: CSF = cerebro-spinal fluid; DSST = digit symbol substitution test; fMRI = functional magnetic resonance imaging.

^*Obtained for n = 18 of 20 in the physical activity intervention group.

^†Number of correct answer/total number of trial × 100.

^‡Time between stimulus presentation and time of response recording.