Associations Between Dementia/Mild Cognitive Impairment and Cognitive Performance and Activity Levels in Youth

Division of Psychology, Case Western Reserve University, Cleveland, Ohio, United States
Journal of the American Geriatrics Society (Impact Factor: 4.57). 08/2005; 53(7):1191-6. DOI: 10.1111/j.1532-5415.2005.53361.x
Source: PubMed


To study the associations between dementia/mild cognitive impairment (MCI) and cognitive performance and activity levels in youth.
Retrospective cohort study.
Research volunteers living throughout the United States.
A total of 396 persons (mean age 75) who were graduates of the same high school in the mid-1940s.
Adolescent intelligence quotient (IQ) scores were gathered from archived student records, and activity levels were determined from yearbooks. A two-stage telephone screening procedure (Modified Telephone Interview for Cognitive Status or Informant Questionnaire on Cognitive Decline in the Elderly followed by Dementia Questionnaire) was used to determine adult cognitive status. Data were analyzed using logistic regression to model the risk of cognitive impairment (dementia/MCI) versus no cognitive impairment as a function of IQ and activity level, adjusting for sex and education.
High adolescent IQ and greater activity level were each independently associated with a lower risk for dementia/MCI (odds ratio (OR) for a 1-standard deviation increase in IQ=0.51, 95% confidence interval (CI)=0.32-0.79; OR for a unit increase in activity=0.32, 95% CI=0.12-0.84). No association was found between sex or education and adult cognitive status in this model.
High IQ and greater activity levels in youth reduce the risk for cognitive impairments in aging. The mechanism(s) underlying these associations are unknown, but intelligence may be a marker for cognitive/neurological "reserve," and involvement in activities may contribute to "reserve." Early neuropathology and ascertainment bias are also possible explanations for the observed associations.

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    • "Frequency of attainment is included as an important factor for assessing life-space (Baker et al., 2003). A previous study indicated that greater activity levels in youth reduced the risk of cognitive impairments in aging, and that involvement in certain activities may contribute to cognitive ''reserve'' (Fritsch et al., 2005). In addition, an epidemiological study suggested that participation in cognitively stimulating leisure activity (e.g., attending a class, lecture, or public meeting; and participating in community, church, or social clubs) may attenuate the effects of brain lesion pathology on cognitive performance in older adults (Saczynski et al., 2008). "
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