The findings were based on a 10-year study on 66 people aged 55 years and over. By looking at MRI scans to measure their brain structure and neuropsychological assessment of brain volume, as well as factors related to recording hours of sleep, the researchers found that those who sleep less show more rapid ventricular enlargement and decreased cognitive performance.
"Our findings related to short sleep markers of brain aging," said Dr. June Lo, lead author of the report and the Duke-NUS researchers.
Previous studies have shown, enlargement of the ventricles of the brain that is driving faster cognitive decline and driving the development of neurodegenerative diseases such as Alzheimer's, said the Duke-NUS, reported by Channel News Asia.
"Good advice is generally cited seven hours a day to (sleep) adults will provide optimum performance on cognitive," said Professor Michael Chee, senior author and Director of the Center for Cognitive Neuroscience at Duke-NUS.
The college said the findings related to the rapid aging of society Singapore, and hope this study opens the way for formulating future work to workers who lack sleep and decreased cognitive contribution, including dementia.
Research University of Warwick
While the research results of researchers at the University of Warwick in the UK shows, sleep problems associated with memory and executive functions of the brain that is worse in people aged 50 to 64 years.
The researchers came to the conclusion after analyzing the data sleep and cognitive (brain function) of the 3,968 men and 4,281 women who took part in the English Longitudinal Study of Ageing (ELSA) which reported the quality and quantity of sleep for a month.
The study shows that there is a relationship between sleep quality and brain functions change with age.
In adults aged 50 and 64 years old, sleeping in the short term (less than six hours per night) and sleep in the long term (more than eight hours per night) scores associated with lower brain function.
In contrast, the older adults (65-89 years) scored lower brain functions were only observed in their long sleep time.
"Six to eight hours of sleep per night is essential for optimal brain function in younger adults," said Dr. Michelle A. Miller of the University of Warwick in public broadcasting University of Warwick.
"These results are consistent with previous research, which showed six to eight hours of sleep per night for optimal physical health, including the lowest risk of obesity, hypertension, diabetes, heart disease and stroke," he added.
Interestingly, the younger adults were ahead of retirement, quality of sleep does not have a significant relationship with brain function score.
Whereas in older adults (65 years), no significant relationship between sleep quality and scores were observed.
"Optimizing sleep at an older age can help delay brain function decline with age or it may slow or prevent the rapid decline leading to dementia," said Professor Francesco Cappuccio respond to the results of a study published in the journal PLoS ONE on June 26.
Dr. Miller concluded, if lack of sleep is the cause of cognitive decline in the future, then the improvement in the non-pharmacological sleep interventions may provide an alternative low cost Public Health and more accessible to delay or slow the rate of cognitive decline.
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