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Interactive effects of physical activity and APOE-I?4 on BOLD semantic memory activation in healthy elders. Neuroimage 2011 Jan 01;54(1):635-44

Date

08/10/2010

Pubmed ID

20691792

Pubmed Central ID

PMC2962671

DOI

10.1016/j.neuroimage.2010.07.070

Scopus ID

2-s2.0-77957949200   85 Citations

Abstract

Evidence suggests that physical activity (PA) is associated with the maintenance of cognitive function across the lifespan. In contrast, the apolipoproteinE-I?4 (APOE-I?4) allele, a genetic risk factor for Alzheimer's disease (AD), is associated with impaired cognitive function. The objective of this study was to examine the interactive effects of PA and APOE-I?4 on brain activation during memory processing in older (ages 65-85) cognitively intact adults. A cross-sectional design was used with four groups (n=17 each): (1) Low Risk/Low PA; (2) Low Risk/High PA; (3) High Risk/Low PA; and (4) High Risk/High PA. PA level was based on self-reported frequency and intensity. AD risk was based on presence or absence of an APOE-I?4 allele. Brain activation was measured using event-related functional magnetic resonance imaging (fMRI) while participants performed a famous name discrimination task. Brain activation subserving semantic memory processing occurred in 15 functional regions of interest. High PA and High Risk were associated with significantly greater semantic memory activation (famous>unfamiliar) in 6 and 3 of the 15 regions, respectively. Significant interactions of PA and Risk were evident in 9 of 15 brain regions, with the High PA/High Risk group demonstrating greater semantic memory activation than the remaining three groups. These findings suggest that PA selectively increases memory-related brain activation in cognitively intact but genetically at-risk elders. Longitudinal studies are required to determine whether increased semantic memory processing in physically active at-risk individuals is protective against future cognitive decline.

Author List

Smith JC, Nielson KA, Woodard JL, Seidenberg M, Durgerian S, Antuono P, Butts AM, Hantke NC, Lancaster MA, Rao SM

Authors

Piero G. Antuono MD Professor in the Neurology department at Medical College of Wisconsin
Alissa Butts PhD Assistant Professor in the Neurology department at Medical College of Wisconsin
Kristy Nielson PhD Professor in the Psychology department at Marquette University




MESH terms used to index this publication - Major topics in bold

Aged
Aged, 80 and over
Alzheimer Disease
Apolipoprotein E4
Auditory Perception
Brain
Dementia
Educational Status
Female
Humans
Leisure Activities
Magnetic Resonance Imaging
Male
Memory
Patient Selection
Sensitivity and Specificity
Verbal Learning