Two of three older adults experienced only a small amount of cognitive decline during a decade-long study, according to new research.
The findings challenge the perception mental deterioration is normal in seniors, the authors say. The study, done on 1,049 adults who initially had no dementia, was published Friday in the journal Age and Aging.
“This research is important,” says Richard Jones, an assistant professor of medicine at Harvard Medical School, “because the focus for seniors can be on living independently for as long as possible and putting less of a burden on our health-care system.”
The research was done at Duke University, Rush University, and the Institute for Aging Research of Hebrew SeniorLife, an affiliate of Harvard Medical School. The cognitive skills of the participants (ages 56 – 102) were tested annually.
By assuming cognitive decline is a part of normal aging, physicians and clinicians dismiss performance from an elderly patient as something that is to be expected, the authors say. With an understanding that cognitive decline is not normal, however, poor performance can be investigated and preventable or reversible conditions, such as delirium, medication side effects, or vitamin deficiency, can be addressed.
The study participants were Catholic nuns, monks and priests from 13 states. The researchers identified three groups of people, those experiencing slow, moderate and rapid cognitive decline. About two in three participants were in the slow decline group.
“This was a study of cognitive performance, not IQ,” says Jones. “But one could think of our results in terms of an outcome that was scored like an IQ test, where 100 was average and the normal range is between 70 and 130.”
He adds an 75-year-old person, with a score of 100 in 2005 would be expected to have a score of 94 in 2015 if they were in the slow decline group.
“That is not much of a change, and it is the group where most people fit,” he says.
However, a minority of older adults experienced a faster decline. A 75-year-old with a cognitive performance score of 100 in 2005 would have a score of 57 in 2015.
“People with moderate or fast cognitive decline, and their families, probably need medical or social support,” says Jones.
Other findings: People in the moderate and fast decline groups had more Alzheimer’s disease neuropathology at autopsy than did people showing slow decline class.
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