Improving deep sleep may prevent dementia

Shutterstock_1978804178
The researchers found, on average, that the amount of deep sleep declined between the two studies, indicating slow wave sleep loss with ageing. [Source: Shutterstock]

As little as a 1% reduction in deep sleep per year for people over 60 years of age translates into a 27% increased risk of dementia, according to a Monash study which suggests that enhancing or maintaining deep sleep, also known as slow wave sleep, in older years could stave off 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 today 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.

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 ageing.

 

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 per cent increase in the risk of dementia.

“Slow-wave sleep, or deep sleep, supports the ageing 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.”

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 also examined whether genetic risk for Alzheimer’s disease or brain volumes suggestive of early neurodegeneration were 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.”

Leave a Reply

Your email address will not be published. Required fields are marked *

Advertisement
Advertisement
Advertisement

Comfort plates: the crockery that helps residents eat independently

An aged care resident wept when staff at his nursing home served his meal for the first time on a plate he could eat from independently. No longer did he have to use the plate guards that had previously made him stand out from all the other residents. At the Aged Care Royal Commission earlier... Read More

What is the Moderna COVID vaccine? Does it work and is it safe?

Overnight, Boston-based pharmaceutical company Moderna announced a new supply agreement with Australia for 25 million doses of its COVID-19 vaccine. The deal includes ten million doses against the original strain of the coronavirus to be delivered this year. Read More

Eating more protein halts malnutrition

  Increasing the amount of protein eaten daily prevents aged care residents from becoming more malnourished, according to new research. Sandra Iuliano, senior research fellow, University of Melbourne, told HelloCare that focusing on nutrition in aged care has enormous benefits to residents’ health, and is also likely to have cost benefits too. Food should be... Read More
Advertisement