Physical Activity and Amyloid-β Brain Levels in Elderly Adults with Intact Cognition and Mild Cognitive Impairment

• Autores: Philipe de Souto Barreto, Sandrine Andrieu, Pierre Payoux, Laurent Demougeot, Yves Rolland, Bruno Vellas
• Localización: Journal of the American Geriatrics Society, ISSN 0002-8614, Vol. 63, Nº. 8, 2015, págs. 1634-1639
• Idioma: inglés
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• Resumen

  • Objectives To examine the associations between amyloid-β brain deposition and physical activity (PA) in elderly adults without dementia and to investigate whether the association has a dose-response relationship.

    Design Cross-sectional study.

    Setting French community-dwelling people.

    Participants Elderly adults with normal or mildly impaired cognition (mean age 74.7 ± 4.2; 60.4% female) with available information on current self-reported PA and amyloid-β brain deposition measured using positron emission tomography (PET) using the PET-ligand florbetapir F 18 (n = 268).

    Measurements A standardized uptake value ratio (SUVR) was obtained for each subject. Participants were divided according to amyloid plaque cortical retention defined according to a SUVR cutoff of 1.10 (SUVR+ vs SUVR−).

    Results Bivariate and multivariate analyses showed that PA was not significantly associated with SUVR. SUVR+ and SUVR− participants did not differ in terms of volume (continuous PA variables) and levels (categorical PA variables) of PA. PA was not correlated with SUVR in apolipoprotein E ε4 carriers or noncarriers. PA was not associated with cognitive function.

    Conclusion Although PA protects against dementia, there is no solid evidence that this protection involves a reduction in amyloid-β brain deposition. Further studies are needed to determine whether PA (ideally measured at several time-points using objective measures) is involved in the pathophysiology of Alzheimer's disease.