Seasons and dementia
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People with Alzheimer’s have better cognition skills in the late summer and early fall, than in the winter and spring, according to a new study.
Adults both with and without Alzheimer’s disease have better cognition skills in the late summer and early fall than in the winter and spring, according to a new study. (The study was published in PLOS Medicine by Andrew Lim of Sunnybrook Health Sciences Centre and the University of Toronto, Canada, and colleagues.)
There have been few previous studies concerning the association between season and cognition in older adults. In the new work, researchers analyzed data on 3,353 people enrolled in three different cohort studies in the U.S., Canada, and France, with fascinating results.
Participants had undergone neuropsychological testing and, for some participants, levels of proteins and genes associated with Alzheimer’s disease were available.
The authors found that average cognitive functioning was higher in the summer and fall than the winter and spring, equivalent in cognitive effect to 4.8 years difference in age-related decline. In addition, the odds of meeting the diagnostic criteria for mild cognitive impairment or dementia were higher in the winter and spring (odds ratio 1.31, 95% CI: 1.10-1.57) than summer or fall.
The association between season and cognitive function remained significant even when the data was controlled for potential confounders, including depression, sleep, physical activity, and thyroid status.
Finally, an association with seasonality was also seen in levels of Alzheimer’s-related proteins and genes in cerebrospinal fluid and the brain. However, the study was limited by the fact that each participant was only assessed once per annual cycle, and only included data on individuals from temperate northern-hemisphere regions, not from southern-hemisphere or equatorial regions.
“There may be value in increasing dementia-related clinical resources in the winter and early spring when symptoms are likely to be most pronounced,” the authors say. “By shedding light on the mechanisms underlying the seasonal improvement in cognition in the summer and early fall, these findings also open the door to new avenues of treatment for Alzheimer’s disease.”
REFERENCE:
- Andrew S. P. Lim, Chris Gaiteri, Lei Yu, Shahmir Sohail, Walter Swardfager, Shinya Tasaki, Julie A. Schneider, Claire Paquet, Donald T. Stuss, Mario Masellis, Sandra E. Black, Jacques Hugon, Aron S. Buchman, Lisa L. Barnes, David A. Bennett, Philip L. De Jager. Seasonal plasticity of cognition and related biological measures in adults with and without Alzheimer disease: Analysis of multiple cohorts. PLOS Medicine, 2018; 15 (9): e1002647 DOI: 10.1371/journal.pmed.1002647
SOURCE:
Here is a great dementia resource for caregivers and healthcare professionals.
Here is a way for nurses administrators, social workers and other health care professionals to get an easy ceu or two.
Source: http://dementiaviews.blogspot.com/2018/10/seasons-and-dementia.html
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