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Aging Brains Beware: Just 1% Less Deep Sleep Could Significantly Increase Seniors Risk of Dementia

December 13, 2023
in Science
Aging Brains Beware: Just 1% Less Deep Sleep Could Significantly Increase Seniors Risk of Dementia
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Exploding Brain Dementia Concept

A study reveals that a 1% annual reduction in deep sleep among those over 60 increases dementia risk by 27%, suggesting the importance of maintaining deep sleep to potentially prevent dementia.

A decrease of 1% in deep sleep each year for individuals aged 60 and older corresponds to a 27% higher risk of developing dementia.

A study has found that every 1% decrease in deep sleep annually in individuals over 60 years old is associated with a 27% higher risk of dementia. This research indicates that improving or preserving deep sleep, known as slow-wave sleep, in later life may help prevent dementia.

The study, led by Associate Professor Matthew Pase, from the Monash School of Psychological Sciences and the Turner Institute for Brain and Mental Health in Melbourne, Australia, and published in JAMA Neurology, looked at 346 participants, over 60 years of age, enrolled in the Framingham Heart Study who completed two overnight sleep studies in the time periods 1995 to 1998 and 2001 to 2003, with an average of five years between the two studies.

Link Between Sleep and Dementia Risk

These participants were then carefully followed for dementia from the time of the second sleep study through to 2018. The researchers found, on average, that the amount of deep sleep declined between the two studies, indicating slow-wave sleep loss with aging. Over the next 17 years of follow-up, there were 52 cases of dementia. Even adjusting for age, sex, cohort, genetic factors, smoking status, sleeping medication use, antidepressant use, and anxiolytic use, each percentage decrease in deep sleep each year was associated with a 27 percent increase in the risk of dementia.

“Slow-wave sleep, or deep sleep, supports the aging brain in many ways, and we know that sleep augments the clearance of metabolic waste from the brain, including facilitating the clearance of proteins that aggregate in Alzheimer’s disease,” Associate Professor Pase said.

“However, to date, we have been unsure of the role of slow-wave sleep in the development of dementia. Our findings suggest that slow-wave sleep loss may be a modifiable dementia risk factor.”

Further Insights from the Study

Associate Professor Pase said that the Framingham Heart Study is a unique community-based cohort with repeated overnight polysomnographic (PSG) sleep studies and uninterrupted surveillance for incident dementia.

“We used these to examine how slow-wave sleep changed with aging and whether changes in slow-wave sleep percentage were associated with the risk of later-life dementia up to 17 years later,” he said.

“We also examined whether genetic risk for Alzheimer’s Disease or brain volumes suggestive of early neurodegeneration was associated with a reduction in slow-wave sleep. We found that a genetic risk factor for Alzheimer’s disease, but not brain volume, was associated with accelerated declines in slow wave sleep.”

Reference: “Association Between Slow-Wave Sleep Loss and Incident Dementia” by Jayandra J. Himali, Andree-Ann Baril, Marina G. Cavuoto, Stephanie Yiallourou, Crystal D. Wiedner, Dibya Himali, Charles DeCarli, Susan Redline, Alexa S. Beiser, Sudha Seshadri and Matthew P. Pase, , JAMA Neurology.
DOI: 10.1001/jamaneurol.2023.3889

>>> Read full article>>>
Copyright for syndicated content belongs to the linked Source : SciTechDaily – https://scitechdaily.com/aging-brains-beware-just-1-less-deep-sleep-could-significantly-increase-seniors-risk-of-dementia/

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