Women's cognitive decline begins earlier than previously believed

Credit: George Hodan/public domain

UCLA researchers have found that mental sharpness in women begins to decline as early as their 50s. The study, which followed the same group of healthy women for 10 years after menopause, found that their average decline in mental processing ability was 5 percent during the decade-long period. Cognitive processing speed, which includes speed of perception and reaction, showed an average decline of around 1 percent every two years and verbal memory declined on average around 1 percent every five years.

Previous longitudinal studies in midlife women had failed to consistently detect these cognitive declines. For this study, the researchers accounted for what are called "practice effects," which is when repeat testing using the same tests in the same individuals influence the results. Practice effects mask some effects of the menopause transition. In this way they were able to uncover evidence of declines in two domains of cognitive functioning—processing speed and .

The researchers examined data on more than 2,000 healthy women enrolled in the Study of Women's Health Across the Nation, or SWAN, who were tested regularly over several years to measure . The were in their 40s when they enrolled in 1996 and were followed every one to two years for a median period of 6.5 years.

Women in their 40s and 50s who find they are forgetting things more often or think they are slower to react may only be experiencing usual aging, analogous to gradual slowing of physical reaction time, running speed, metabolic rate, and other declines that we all experience in midlife.

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More information: Arun S. Karlamangla et al. Evidence for Cognitive Aging in Midlife Women: Study of Women's Health Across the Nation, PLOS ONE (2017). DOI: 10.1371/journal.pone.0169008
Journal information: PLoS ONE

Citation: Women's cognitive decline begins earlier than previously believed (2017, January 20) retrieved 23 April 2021 from https://medicalxpress.com/news/2017-01-women-cognitive-decline-earlier-previously.html
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