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Diabetes, aging, and cognitive decline.

Christopher M Ryan1

  • 1Department of Psychiatry, Western Psychiatric Institute & Clinic, University of Pittsburgh School of Medicine, 3811 O'Hara Street, Pittsburgh, PA 15213, USA. ryancm@upmc.edu

Neurobiology of Aging
|October 11, 2005
PubMed
Summary
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Cognitive changes in type 1 diabetes are linked to psychomotor slowing, especially with diabetes complications. Other cognitive skills remain largely unaffected by diabetes duration or age.

Area of Science:

  • Neuroscience
  • Endocrinology
  • Psychology

Background:

  • Type 1 diabetes is known to affect cognitive function in both children and adults.
  • The specific impact of diabetes duration and aging on cognitive decline in type 1 diabetes is not well understood.

Purpose of the Study:

  • To assess neuropsychological performance in adults with and without type 1 diabetes.
  • To investigate the relationship between age, diabetes duration, and cognitive function.

Main Methods:

  • Cross-sectional study involving 200 adults with type 1 diabetes and 175 non-diabetic adults.
  • Participants aged 18-64 years were stratified into five age bands.
  • Neuropsychological tests measured problem-solving, learning and memory, and psychomotor speed.

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Main Results:

  • Age-related cognitive declines were observed across problem-solving, learning/memory, and psychomotor speed in both groups.
  • Diabetic and non-diabetic subjects showed significant differences only in psychomotor speed.
  • Biomedical complications like retinopathy, neuropathy, and peripheral vascular disease (PVD) best predicted psychomotor slowing.

Conclusions:

  • Psychomotor slowing appears to be the primary cognitive deficit associated with type 1 diabetes.
  • The relative preservation of other cognitive skills in type 1 diabetes warrants further investigation.