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 Although disability rates have been falling, up to one in five
seniors have at least one limitation in their ability to perform
tasks, the researchers write in the Journal of the American
Geriatrics Society.
“Most people don’t get sufficient sleep - as a culture we tend to
devalue sleep - and we tend to underestimate the potential impact of
not getting adequate sleep,” lead author Elliot Friedman told
Reuters Health by email.
Research has linked poor sleep to poor health, but little is known
about how sleep affects daily functioning, said Friedman, a
gerontologist at Purdue University in West Lafayette, Indiana.
For the new study, Friedman analyzed survey data collected in
1995-1996 and then again in 2004-2006 from 3,620 people between the
ages of 24 and 75 at the outset.
Participants answered questions about any sleep issues they had in
the past year and their ability to complete daily living tasks such
as bathing, dressing, and walking one block. They also reported on
their ability to complete more difficult ‘instrumental’ tasks such
as bending over, vacuuming, carrying groceries, climbing stairs,
walking a mile, or running.
At both surveys, about 11 percent of participants reported chronic
sleep issues.
Compared to people who slept well, those with poor sleep at the
first survey were 55 percent more likely to report greater limits on
their activities of daily living a decade later, and 28 percent more
likely to have increased difficulty with instrumental tasks.
Among participants who were disability-free at the first survey,
those who had sleep problems were twice as likely to be having
trouble with daily living tasks 10 years later and 70 percent more
likely to develop trouble with instrumental tasks.
The researchers also looked at other potential influences on
disability such as demographic factors, health conditions, obesity,
and smoking, to ensure that these were not causing the issues.
Age had no effect on the changes in daily living tasks between the
two surveys. However, for the more advanced instrumental tasks,
younger and middle aged people with sleep issues saw greater
declines.
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Friedman offered a possible explanation for the findings, noting,
“If sleep is not restful, people are less likely to be physically
active, and both low physical activity and sedentary behavior are
risk factors for disability.”
Friedman added that trouble with sleep is also linked to obesity and
inflammation, which both increase the risk of disability.
Dr. Andrew Lim of the University of Toronto, who studies sleep and
health effects, pointed out that the study did not look at which
aspects of poor sleep are linked to disability. Being able to target
a specific issue like snoring, insomnia, or restless legs might be
helpful, he said.
Lim, who was not involved in the study, also noted that poor sleep
can be related to other issues like joint pain, mental illness or
heart disease, and these conditions might be the true cause of the
disability seen at the later follow-up.
Lim advises people to develop healthy sleep routines, including
keeping regular hours and avoiding coffee and alcohol. “Sleep long
enough that one is not sleepy during the day,” he added. “Sleep in a
quiet, dark environment, and keep a quiet, dark environment in the
hours before bed.”
“Greater focus on adequate sleep could have broad health benefits,
including reducing peoples’ risk of disability as they age into
their later years,” Friedman said.
SOURCE: bit.ly/2cVGteU Journal of the American Geriatrics Society,
online September 14, 2016.
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