Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:


Sleep quality and duration improve cognition in aging populations


University of Oregon-led research finds women sleeping longer and struggling with quality

Maybe turning to sleep gadgets -- wristbands, sound therapy and sleep-monitoring smartphone apps -- is a good idea. A new University of Oregon-led study of middle-aged or older people who get six to nine hours of sleep a night think better than those sleeping fewer or more hours.

University of Oregon doctoral student Theresa E. Gildner led a study, supported by the NIH, that looked at sleep quality and duration, and the impacts of both on health. The results are the first to emerge from a longitudinal study.

Credit: University of Oregon

The study, published in the June issue of the Journal of Clinical Sleep Medicine, reaffirms numerous small-scale studies in the United States, Western Europe and Japan, but it does so using data compiled across six middle-income nations and involving more than 30,000 subjects for a long-term project that began in 2007.

"We wanted to look at aging, particularly dementia and cognitive decline as people get older, and the importance of sleep. Our results provide compelling evidence that sleep matters a lot," said lead author Theresa E. Gildner, a doctoral student in the UO's anthropology department. "In all six countries, which are very different culturally, economically and environmentally -- despite all these differences -- you see similar patterns emerging."

... more about:
»anthropology »cognitive »populations »sleep »sleeping

Video Overview of Project and Study:

The study, based on the first wave of data from a continuing long-term project, focuses on people 50 years old and older in China, Ghana, India, Mexico, the Russian Federation and South Africa. Among the key findings were:

  • Men reported higher sleep quality than women in all six nations, with men and women in Mexico reporting the highest. 


  • Women reported longer sleep durations than men in all countries except Russia and Mexico. Men and women in South Africa slept longer than in any other country. The least sleep hours for both sexes occurred in India.


  • Individuals sleeping less than six hours and more than nine hours had significantly lower cognitive scores compared to those in the intermediate group.

The study concludes that the findings have important implications for future intervention strategies for dementia. The consistent associations between intermediate sleep durations, high sleep quality and enhanced cognitive performance in these diverse populations suggests that improving sleep patterns may help reduce the level of cognitive decline as seen in older adults.

Another important finding, Gildner said, is the gender difference in all sleep and cognition variables. Citing previous studies, the authors hypothesized that women's sleep patterns reflect postmenopausal changes, increased bladder instability and feelings of isolation after the loss of a spouse or lack of social support. Cognition scores of women may result from their sleep difficulties and/or lower educational levels.

The growing database in the long-term study, known as the Study on global AGEing and adult health (SAGE), is allowing researchers to mine many combinations of variables connected to health and lifestyle, said J. Josh Snodgrass, professor of anthropology at the UO. "It also will allow anthropologists to explore cultural factors that may contribute to sleeping and health patterns."

Snodgrass is a key investigator on SAGE, which is funded by a joint agreement of the National Institutes of Health and the World Health Organization.

"This study is hugely powerful and so different from what's been done in the past, simply because of the consistency of how the data was collected -- multi-national, random samples of people," he said. "Sleep is something that is important but often undervalued in our society.

"From doing this research and being familiar with the literature," he added, "an emphasis on sleep issues by the media in recent years is warranted. Every single piece of evidence that people look at now as they are investigating sleep and different health associations is all showing that sleep really, really, really matters. We're just now scratching the surface on what patterns of sleep normally are, and also what are these associations between sleep and health issues."


Co-authors with Gildner and Snodgrass were: UO doctoral student Melissa A. Liebert, anthropology; Paul Kowal of the World Health Organization in Geneva, Switzerland, and University of Newcastle Research Centre on Gender, Health, and Aging in Australia; and Dr. Somnath Chatterji of the World Health Organization.

Funding for the joint NIH-WHO agreement comes from the NIH National Institute on Aging (YA1323-08-CN-0020). An additional NIH grant (RO1-AG034479) also supports the project, which will continue to track a variety of changes among the participants over time.

About the University of Oregon

The University of Oregon is among the 108 institutions chosen from 4,633 U.S. universities for top-tier designation of "Very High Research Activity" in the 2010 Carnegie Classification of Institutions of Higher Education. The UO also is one of two Pacific Northwest members of the Association of American Universities.

Sources: Theresa E. Gildner, doctoral student, biological anthropology, 541-346-5109,, and J. Josh Snodgrass, associate professor of anthropology, 541-346-4823,

Jim Barlow | Eurek Alert!
Further information:

Further reports about: anthropology cognitive populations sleep sleeping

More articles from Studies and Analyses:

nachricht Climate study finds evidence of global shift in the 1980s
26.11.2015 | Leibniz-Institut für Gewässerökologie und Binnenfischerei (IGB)

nachricht Network analysis shows systemic risk in mineral markets
16.11.2015 | International Institute for Applied Systems Analysis (IIASA)

All articles from Studies and Analyses >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: Climate study finds evidence of global shift in the 1980s

Planet Earth experienced a global climate shift in the late 1980s on an unprecedented scale, fuelled by anthropogenic warming and a volcanic eruption, according to new research published this week.

Scientists say that a major step change, or ‘regime shift’, in the Earth’s biophysical systems, from the upper atmosphere to the depths of the ocean and from...

Im Focus: Innovative Photovoltaics – from the Lab to the Façade

Fraunhofer ISE Demonstrates New Cell and Module Technologies on its Outer Building Façade

The Fraunhofer Institute for Solar Energy Systems ISE has installed 70 photovoltaic modules on the outer façade of one of its lab buildings. The modules were...

Im Focus: Lactate for Brain Energy

Nerve cells cover their high energy demand with glucose and lactate. Scientists of the University of Zurich now provide new support for this. They show for the first time in the intact mouse brain evidence for an exchange of lactate between different brain cells. With this study they were able to confirm a 20-year old hypothesis.

In comparison to other organs, the human brain has the highest energy requirements. The supply of energy for nerve cells and the particular role of lactic acid...

Im Focus: Laser process simulation available as app for first time

In laser material processing, the simulation of processes has made great strides over the past few years. Today, the software can predict relatively well what will happen on the workpiece. Unfortunately, it is also highly complex and requires a lot of computing time. Thanks to clever simplification, experts from Fraunhofer ILT are now able to offer the first-ever simulation software that calculates processes in real time and also runs on tablet computers and smartphones. The fast software enables users to do without expensive experiments and to find optimum process parameters even more effectively.

Before now, the reliable simulation of laser processes was a job for experts. Armed with sophisticated software packages and after many hours on computer...

Im Focus: Quantum Simulation: A Better Understanding of Magnetism

Heidelberg physicists use ultracold atoms to imitate the behaviour of electrons in a solid

Researchers at Heidelberg University have devised a new way to study the phenomenon of magnetism. Using ultracold atoms at near absolute zero, they prepared a...

All Focus news of the innovation-report >>>



Event News

Fraunhofer’s Urban Futures Conference: 2 days in the city of the future

25.11.2015 | Event News

Gluten oder nicht Gluten? Überempfindlichkeit auf Weizen kann unterschiedliche Ursachen haben

17.11.2015 | Event News

Art Collection Deutsche Börse zeigt Ausstellung „Traces of Disorder“

21.10.2015 | Event News

Latest News

Siemens to supply 126 megawatts to onshore wind power plants in Scotland

27.11.2015 | Press release

Two decades of training students and experts in tracking infectious disease

27.11.2015 | Life Sciences

Coming to a monitor near you: A defect-free, molecule-thick film

27.11.2015 | Materials Sciences

More VideoLinks >>>