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Article
Lifestyle and Genetic Contributions to Cognitive Decline and Hippocampal Structure and Function in Healthy Aging
Current Alzheimer Research
  • John L. Woodard, Wayne State University
  • Michael Sugarman, Wayne State University
  • Kristy A Nielson, Marquette University
  • J. Carson Smith, Medical College of Wisconsin
  • Michael Seidenberg, Rosalind Franklin University of Medicine and Science
  • Sally Durgerian, Medical College of Wisconsin
  • Alissa Butts, Marquette University
  • Nathan Hantke, Marquette University
  • Melissa A. Lancaster, Rosalind Franklin University of Medicine and Science
  • Monica A. Matthews, Rosalind Franklin University of Medicine and Science
  • Stephen M. Rao, Cleveland Clinic
Document Type
Article
Language
eng
Format of Original
11 p.
Publication Date
1-1-2012
Publisher
Bentham Science Publishers
Original Item ID
doi: 10.2174/156720512800492477
Disciplines
Abstract

Background: Engagement in cognitively stimulating activities (CA) and leisure time physical activity (PA) have been associated with maintaining cognitive performance and reducing the likelihood of cognitive decline in older adults. However, neural mechanisms underlying protective effects of these lifestyle behaviors are largely unknown. In the current study, we investigated the effect of self-reported PA and CA on hippocampal volume and semantic processing activation during a fame discrimination task, as measured by functional magnetic resonance imaging (fMRI). We also examined whether possession of the apolipoprotein E (APOE) ?4 allele could moderate the effect of PA or CA on hippocampal structure or function. Methods: Seventy-eight healthy, cognitively intact older adults underwent baseline neuropsychological assessment, hippocampal volume measurement via manually-traced structural MRI, and task-activated fMRI. Results: After 18 months, 27 participants declined by one standard deviation or more on follow-up neuropsychological testing. Logistic regression analyses revealed that CA alone or in combination with baseline hippocampal structure or functional activity did not predict the probability of cognitive decline. In contrast, PA interacted with APOE 4 status such that engagement in PA reduced the risk of cognitive decline in APOE 4 carriers only. Furthermore, the benefits of PA appeared to diminish with reduced functional activity or volume in the hippocampus. Conclusions: Our findings suggest that increased leisure time PA is associated with reduced probability of cognitive decline in persons who are at high risk for AD. The beneficial effects of PA in this group may be related to enhancement of the functional and structural integrity of the hippocampus.

Comments

Accepted version. Current Alzheimer Research, Vol. 9, No. 4 (2012): 436-446. DOI. © Bentham Science Publishers 2012. Used with permission.

Citation Information
John L. Woodard, Michael Sugarman, Kristy A Nielson, J. Carson Smith, et al.. "Lifestyle and Genetic Contributions to Cognitive Decline and Hippocampal Structure and Function in Healthy Aging" Current Alzheimer Research (2012) ISSN: 1567-2050
Available at: http://works.bepress.com/kristy_nielson/22/