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The association between aerobic fitness and executive function is mediated by prefrontal cortex volume.
Brain Behav Immun 2012; 26(5):811-9BB

Abstract

Aging is marked by a decline in cognitive function, which is often preceded by losses in gray matter volume. Fortunately, higher cardiorespiratory fitness (CRF) levels are associated with an attenuation of age-related losses in gray matter volume and a reduced risk for cognitive impairment. Despite these links, we have only a rudimentary understanding of whether fitness-related increases in gray matter volume lead to elevated cognitive function. In this cross-sectional study, we examined whether the association between higher aerobic fitness levels and elevated executive function was mediated by greater gray matter volume in the prefrontal cortex (PFC). One hundred and forty-two older adults (mean age=66.6 years) completed structural magnetic resonance imaging (MRI) scans, CRF assessments, and performed Stroop and spatial working memory (SPWM) tasks. Gray matter volume was assessed using an optimized voxel-based morphometry approach. Consistent with our predictions, higher fitness levels were associated with: (a) better performance on both the Stroop and SPWM tasks, and (b) greater gray matter volume in several regions, including the dorsolateral PFC (DLPFC). Volume of the right inferior frontal gyrus and precentral gyrus mediated the relationship between CRF and Stroop interference while a non-overlapping set of regions bilaterally in the DLPFC mediated the association between CRF and SPWM accuracy. These results suggest that specific regions of the DLPFC differentially relate to inhibition and spatial working memory. Thus, fitness may influence cognitive function by reducing brain atrophy in targeted areas in healthy older adults.

Authors+Show Affiliations

Department of Psychology and the Center for the Neural Basis of Cognition, University of Pittsburgh, PA 15260, USA. andrea.weinstein@gmail.comNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article
Research Support, N.I.H., Extramural

Language

eng

PubMed ID

22172477

Citation

Weinstein, Andrea M., et al. "The Association Between Aerobic Fitness and Executive Function Is Mediated By Prefrontal Cortex Volume." Brain, Behavior, and Immunity, vol. 26, no. 5, 2012, pp. 811-9.
Weinstein AM, Voss MW, Prakash RS, et al. The association between aerobic fitness and executive function is mediated by prefrontal cortex volume. Brain Behav Immun. 2012;26(5):811-9.
Weinstein, A. M., Voss, M. W., Prakash, R. S., Chaddock, L., Szabo, A., White, S. M., ... Erickson, K. I. (2012). The association between aerobic fitness and executive function is mediated by prefrontal cortex volume. Brain, Behavior, and Immunity, 26(5), pp. 811-9. doi:10.1016/j.bbi.2011.11.008.
Weinstein AM, et al. The Association Between Aerobic Fitness and Executive Function Is Mediated By Prefrontal Cortex Volume. Brain Behav Immun. 2012;26(5):811-9. PubMed PMID: 22172477.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - The association between aerobic fitness and executive function is mediated by prefrontal cortex volume. AU - Weinstein,Andrea M, AU - Voss,Michelle W, AU - Prakash,Ruchika Shaurya, AU - Chaddock,Laura, AU - Szabo,Amanda, AU - White,Siobhan M, AU - Wojcicki,Thomas R, AU - Mailey,Emily, AU - McAuley,Edward, AU - Kramer,Arthur F, AU - Erickson,Kirk I, Y1 - 2011/12/07/ PY - 2011/08/11/received PY - 2011/11/19/revised PY - 2011/11/23/accepted PY - 2011/12/17/entrez PY - 2011/12/17/pubmed PY - 2012/10/20/medline SP - 811 EP - 9 JF - Brain, behavior, and immunity JO - Brain Behav. Immun. VL - 26 IS - 5 N2 - Aging is marked by a decline in cognitive function, which is often preceded by losses in gray matter volume. Fortunately, higher cardiorespiratory fitness (CRF) levels are associated with an attenuation of age-related losses in gray matter volume and a reduced risk for cognitive impairment. Despite these links, we have only a rudimentary understanding of whether fitness-related increases in gray matter volume lead to elevated cognitive function. In this cross-sectional study, we examined whether the association between higher aerobic fitness levels and elevated executive function was mediated by greater gray matter volume in the prefrontal cortex (PFC). One hundred and forty-two older adults (mean age=66.6 years) completed structural magnetic resonance imaging (MRI) scans, CRF assessments, and performed Stroop and spatial working memory (SPWM) tasks. Gray matter volume was assessed using an optimized voxel-based morphometry approach. Consistent with our predictions, higher fitness levels were associated with: (a) better performance on both the Stroop and SPWM tasks, and (b) greater gray matter volume in several regions, including the dorsolateral PFC (DLPFC). Volume of the right inferior frontal gyrus and precentral gyrus mediated the relationship between CRF and Stroop interference while a non-overlapping set of regions bilaterally in the DLPFC mediated the association between CRF and SPWM accuracy. These results suggest that specific regions of the DLPFC differentially relate to inhibition and spatial working memory. Thus, fitness may influence cognitive function by reducing brain atrophy in targeted areas in healthy older adults. SN - 1090-2139 UR - https://www.unboundmedicine.com/medline/citation/22172477/The_association_between_aerobic_fitness_and_executive_function_is_mediated_by_prefrontal_cortex_volume_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0889-1591(11)00599-X DB - PRIME DP - Unbound Medicine ER -