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Longitudinal Research

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Sometimes we want to see how people change over time, as in studies of human development and lifespan. When we test the same group of individuals repeatedly over an extended period of time, we are conducting longitudinal research. Longitudinal research is a research design in which data-gathering is administered repeatedly over an extended period of time. For example, we may survey a group of individuals about their dietary habits at age 20, retest them a decade later at age 30, and then again...
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Related Experiment Video

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Working Memory Training for Older Participants: A Control Group Training Regimen and Initial Intellectual Functioning Assessment
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Long-term multivitamin supplementation and cognitive function in men: a randomized trial.

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    Long-term daily multivitamin use in older men did not improve cognitive function. The study suggests current doses may be too low or the population too well-nourished for benefits in cognitive health.

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    Area of Science:

    • Gerontology and Cognitive Health
    • Nutritional Science and Supplementation

    Background:

    • Widespread multivitamin use contrasts with inconclusive evidence on their impact on age-related cognitive decline.
    • Previous long-term clinical trials on multivitamins and cognitive decline in older adults were lacking.

    Purpose of the Study:

    • To investigate the long-term effects of daily multivitamin supplementation on cognitive health in older men.
    • To evaluate the impact on global cognition, verbal memory, and category fluency over a 12-year period.

    Main Methods:

    • A 12-year randomized, double-blind, placebo-controlled trial (Physicians' Health Study II) involving 5947 male physicians aged 65+.
    • Participants received a daily multivitamin or placebo, with cognitive function assessed up to 4 times.
    • Cognitive assessments included a global composite score and a verbal memory score, a predictor of Alzheimer's disease.

    Main Results:

    • No significant differences in mean cognitive change over time were observed between the multivitamin and placebo groups.
    • Cognitive performance on both global composite and verbal memory scores did not differ between the groups.
    • The mean difference in cognitive change for the global score was -0.01 SU (95% CI, -0.04 to 0.02).

    Conclusions:

    • Long-term daily multivitamin supplementation did not yield cognitive benefits in older male physicians.
    • Potential reasons for the lack of effect include insufficient vitamin doses or a population already adequately nourished.
    • Further research may be needed to determine optimal dosages or specific populations that could benefit from supplementation.