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Change in Cognitive Function by Glucose Tolerance Status in Older Adults: A 4-Year Prospective Study of the Rancho Bernardo Study Cohort
Abstract
BACKGROUND: A few studies have examined change in cognitive performance by diabetes status with disparate results. We examined the 4-year change in cognitive performance among older adults according to glucose tolerance status. METHODS: Three cognitive tests (Mini-Mental State Examination, Verbal Fluency [VF] test, and Trail-Making Test B) were measured 4 years apart in 999 white men and women aged 42 to 89 years, who were enrolled in the Rancho Bernardo Study. Participants were classified with normal (NGT), impaired (IGT) or diabetic glucose tolerance. Sex-specific linear regression models adjusted for age, education, depression score, apolipoprotein E epsilon4 allele, and current estrogen use. We checked for mediation by further adjusting for total cholesterol, low-density lipoprotein cholesterol, high-density lipoprotein cholesterol, and triglyceride levels; blood pressure; glycohemoglobin level; and microalbuminuria, retinopathy, stroke, or coronary heart disease. RESULTS: At baseline, mean cognitive function scores did not differ between glucose tolerance groups. Women with diabetes mellitus had a 4-fold increased risk of a major cognitive decline on the VF test after 4 years compared with nondiabetic women. After multivariate adjustment, VF test scores at follow-up for women were 15.2 +/- 0.6 for those with diabetes, 16.7 +/- 0.4 for those with IGT, and 17.2 +/- 0.2 for those with NGT (P =.007). Glycohemoglobin attenuated this effect, but lipid levels, blood pressure, and microvascular or macrovascular disease did not. Performance on Mini-Mental State Examination and Trail-Making Test B did not differ by baseline glucose status. CONCLUSIONS: Elderly white women with diabetes had a more rapid decline in performance on the VF test compared with women with IGT or NGT. Better glucose control might ameliorate this decline.
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“Table 2 lists the six studies that reported time-related changes as a continuous variable using either the MMSE or 3MS score in individuals with and without a history of diabetes [49, 51, 52, 54, 65, 69].”
From Cognitive decline and dementia in diabetes—systematic overview of prospective observational studies (2005) · cites this paper as [69]
In the citing paper
“Moreover, two of the studies included in this review reported that participants with impaired fasting glucose or impaired glucose tolerance experience more cognitive decline than participants without, further supporting a link between cognitive decline and hyperglycaemia [51, 69, 70].”
From Cognitive decline and dementia in diabetes—systematic overview of prospective observational studies (2005) · cites this paper as [69]
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Metadata
- Authors
- Kanaya, A. M., Barrett-Connor, E., Gildengorin, G., & Yaffe, K.
- Affiliations
- University of California, San Francisco (US)
- Corresponding author
- Kanaya, Alka M.
- Venue
- Archives of Internal Medicine
- Publisher
- American Medical Association (AMA)
- Published
- 2004-06-28
- Volume
- 164
- Issue
- 12
- Pages
- 1327
- ISSN
- 0003-9926 (ISSN-L)
- OpenAlex
- W1973403495
- Cited by
- 255
- References
- 32
- Citations by year
- 2026: 1 · 2025: 4 · 2024: 3 · 2023: 2 · 2022: 7 · 2021: 13 · 2020: 14 · 2019: 15 · 2018: 8 · 2017: 14 · 2016: 14 · 2015: 19 · 2014: 16 · 2013: 9 · 2012: 14
- FWCI
- 7.97
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Archives of Internal Medicine (publishedVersion)
- PubMed (publishedVersion)
- Funders
- National Institute on Aging (AG00888, R01AG007181, P30AG015272)
- National Institute of Diabetes and Digestive and Kidney Diseases (R01DK031801)
- National Institute of Arthritis and Musculoskeletal and Skin Diseases (K12AR047659)
- Topics
- Health Sciences › Medicine › Psychiatry and Mental health › Dementia and Cognitive Impairment Research
- Health Sciences › Medicine › Endocrinology, Diabetes and Metabolism › Diabetes, Cardiovascular Risks, and Lipoproteins
- Health Sciences › Medicine › Oncology › Cancer-related cognitive impairment studies
- Keywords
- glucose tolerance, diabetes mellitus, impaired glucose tolerance, cognitive decline, verbal fluency, older women, glycohemoglobin, glycemic control, Rancho Bernardo Study, sex differences
- MeSH terms
- Adult, Age Factors, Aged, Aged, 80 and over, Blood Glucose, Blood Pressure, California, Cognition, Diabetes Mellitus, Female, Follow-Up Studies, Humans, Cholesterol, HDL, Male, Middle Aged, Prospective Studies, Sex Factors, Statistics as Topic, Systole, Vascular Diseases, Cohort Studies, Biomarkers, Multivariate Analysis, Glucose Intolerance
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