Journal
JOURNAL OF ALZHEIMERS DISEASE
Volume 41, Issue 3, Pages 809-817Publisher
IOS PRESS
DOI: 10.3233/JAD-132252
Keywords
Apolipoprotein E; arterial spin labeling; biological aging; cerebral blood flow; hippocampus; magnetic resonance imaging; physical activity; sedentary behavior
Categories
Funding
- National Institutes of Health [T32 MH019934, R01 MH084796]
- VA CSR& D (Career Development Award) [CDA-2-022-08S]
- Alzheimer's Association [NIRG-07-59143, NIRG 09-131856]
- Sam and Rose Stein Institute for Research on Aging of the University of California, San Diego
Ask authors/readers for more resources
Resting cerebral blood flow (CBF) decreases with age; however regulatory increases in hippocampal CBF have been associated with genetic risk (Apolipoprotein E [APOE] e4 carriers) for Alzheimer's disease (AD). Although physical activity exerts beneficial effects on CBF in healthy elderly, the effects of sedentary behaviors on CBF remain unknown. We measured resting hippocampal CBF (via arterial spin labeling magnetic resonance imaging) and sedentary time/ physical activity (via accelerometry) on 33 cognitively healthy adults (ages 52- 81), 9 of which were APOE e4 carriers. Results indicate that the relationship between sedentary time and CBF in the left hippocampus differs by APOE status, whereby APOE e4 carriers show higher CBF as a function of longer sedentary time (B = 10.8, SE = 3.17, beta = 0.74, t = 3.41, p < 0.01) compared to noncarriers (B = 1.4, SE = 2.7, beta = 0.096, t = 0.51, p = 0.61), possibly suggesting a CBF regulatory response to compensate for metabolic alterations in dementia risk. These preliminary data suggest that the relationship between CBF and sedentary time is different in APOE e4 carriers and noncarriers and that sedentary time may act as a behavioral risk factor for CBF dysregulation in those at genetic risk for developing AD. More research is needed to further understand the role of sedentary behaviors and physical activity on CBF, especially in individuals at genetic risk of developing AD.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available