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Cognitive Trajectories of Older Adults With Prediabetes and Diabetes: A Population-Based Cohort Study
Aging Research Center, Department of Neurobiology, Care Sciences and Society, Karolinska Institutet, Stockholm University, Sweden.
Jönköping University, School of Health and Welfare, HHJ, Institute of Gerontology. Jönköping University, School of Health and Welfare, HHJ. ARN-J (Aging Research Network - Jönköping).ORCID iD: 0000-0002-6305-8993
Aging Research Center, Department of Neurobiology, Care Sciences and Society, Karolinska Institutet, Stockholm University, Sweden.
Aging Research Center, Department of Neurobiology, Care Sciences and Society, Karolinska Institutet, Stockholm University, Sweden.
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2018 (English)In: The journals of gerontology. Series A, Biological sciences and medical sciences, ISSN 1079-5006, E-ISSN 1758-535X, Vol. 73, no 3, p. 400-406Article in journal (Refereed) Published
Abstract [en]

Background: Diabetes has been linked to dementia risk; however, the cognitive trajectories in older adults with diabetes remain unclear. We aimed to investigate the effect of prediabetes and diabetes on cognitive trajectories among cognitively intact older adults in a long-term follow-up study.

Methods: Within the Swedish Adoption/Twin Study of Aging, 793 cognitively intact older adults aged ≥50 were identified at baseline and followed for up to 23 years. Based on standardized scores from 11 cognitive tests, administered at baseline and up to seven follow-ups, four cognitive domains (verbal abilities, spatial/fluid, memory, perceptual speed) were identified by principal-component analysis. Prediabetes was defined according to blood glucose levels in diabetes-free participants. Diabetes was ascertained based on self-report, hypoglycemic medication use and blood glucose levels. Data were analyzed with linear mixed-effect models adjusting for potential confounders.

Results: At baseline, 68 participants (8.6%) had prediabetes and 45 (5.7%) had diabetes. Compared to diabetes-free individuals, people with diabetes had a steeper decline over time in perceptual speed and verbal abilities. The annual declines in these domains were greater than the annual decline in memory. Prediabetes was associated with lower performance in memory in middle-age, but also associated with a less steep memory decline over the follow-up.

Conclusions: Diabetes is associated with a faster decline in perceptual speed and verbal abilities, while prediabetes is associated with lower memory performance in middle-age. However, the detrimental effects of hyperglycemia seem to not affect memory over time.

Place, publisher, year, edition, pages
Oxford University Press, 2018. Vol. 73, no 3, p. 400-406
Keywords [en]
Type 2 diabetes; Cognitive aging; Longitudinal study; Hyperglycemia
National Category
Endocrinology and Diabetes Geriatrics
Identifiers
URN: urn:nbn:se:hj:diva-40988DOI: 10.1093/gerona/glx112ISI: 000426829500022PubMedID: 28633303Scopus ID: 2-s2.0-85042926199Local ID: HHJARNISOAI: oai:DiVA.org:hj-40988DiVA, id: diva2:1232997
Available from: 2018-07-13 Created: 2018-07-13 Last updated: 2018-10-03Bibliographically approved

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