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Women's cognitive decline begins earlier than previously believed

Date:
January 20, 2017
Source:
University of California, Los Angeles (UCLA), Health Sciences
Summary:
Mental sharpness in women begins to decline as early as their 50s. 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, investigators report.
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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 verbal memory.

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 cognitive changes. The women 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. The authors of the study were Arun Karlamangla, WeiJuan Han, MeiHua Huang and Gail Greendale of UCLA, and Margie Lachman of Brandeis University. The study is published in the journal PLOS ONE.


Story Source:

Materials provided by University of California, Los Angeles (UCLA), Health Sciences. Original written by Enrique Rivero. Note: Content may be edited for style and length.


Journal Reference:

  1. Arun S. Karlamangla, Margie E. Lachman, WeiJuan Han, MeiHua Huang, Gail A. Greendale. Evidence for Cognitive Aging in Midlife Women: Study of Women’s Health Across the Nation. PLOS ONE, 2017; 12 (1): e0169008 DOI: 10.1371/journal.pone.0169008

Cite This Page:

University of California, Los Angeles (UCLA), Health Sciences. "Women's cognitive decline begins earlier than previously believed." ScienceDaily. ScienceDaily, 20 January 2017. <www.sciencedaily.com/releases/2017/01/170120090748.htm>.
University of California, Los Angeles (UCLA), Health Sciences. (2017, January 20). Women's cognitive decline begins earlier than previously believed. ScienceDaily. Retrieved May 23, 2017 from www.sciencedaily.com/releases/2017/01/170120090748.htm
University of California, Los Angeles (UCLA), Health Sciences. "Women's cognitive decline begins earlier than previously believed." ScienceDaily. www.sciencedaily.com/releases/2017/01/170120090748.htm (accessed May 23, 2017).

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