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Home Lifestyle Health

How daily walk can take 20 years off your “brain age”

Researchers found that going for a daily walk or bike raid can take 20 years off older people's "brain age"

Ben Gelblum by Ben Gelblum
2019-01-30 21:00
in Health, Lifestyle, Science
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Physical exercise can improve thinking skills in people as young as 20 and going for a daily walk or bike ride can take 20 years off older people’s “brain age”, according to a new study.

Researchers found that regular aerobic exercise boosts the grey matter of all adults – and the benefits increase with age.

Even climbing the stairs improve the thinking skills of students, say scientists.

But the positive effect of physical activity is most dramatic after we reach our 60s – and may reduce the risk of dementia.

Study author Professor Yaakov Stern, of the Taub Institute for the Research on Alzheimer’s Disease and the Ageing Brain at Columbia University in New York, said: ”
“As people age, there can be a decline in thinking skills.

“However our study shows getting regular exercise may help slow or even prevent such decline.

“We found all participants who exercised not only showed improvements in executive function but also increased the thickness in an area of the outer layer of their brain.”

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The study published in Neurology found exercise specifically improved neurons in areas that control executive function.

These relate to a person’s ability to regulate their own behaviour, pay attention, organise and achieve goals.

Prof Stern and colleagues followed 132 people aged 20 to 67 who were randomly assigned to six months of either aerobic exercise or stretching and toning four times a week.

Those in the former group chose from activities including walking on a treadmill, cycling on a stationary bike or using an elliptical machine that simulates stair climbing.

The researchers found these were twice as effective as stretching and toning. Aerobic exercisers improved their overall scores on executive function tests by 0.50 points.

This was a statistically significant difference from those who did stretching and toning – who progressed by 0.25 points.

At 40, the improvement was 0.228 standard deviation units higher in those who exercised compared to those who did stretching and toning. At 60 it was 0.596 more.

Prof Stern said: “Since a difference of 0.5 standard deviations is equivalent to 20 years of age-related difference in performance on these tests, the people who exercised were testing as if they were about 10 years younger at age 40 and about 20 years younger at age 60.”

He added: “Since thinking skills at the start of the study were poorer for participants who were older, our findings suggest that aerobic exercise is more likely to improve age-related declines in thinking skills rather than improve performance in those without a decline.”

None of the participants smoked or had dementia. They also did not exercise at the start of the study and had below average fitness levels.

The aerobic and stretching groups were equally balanced for age, sex, education as well as memory and thinking skills at the outset.

They worked out at a fitness centre and checked in weekly with coaches monitoring their progress. They all wore heart rate monitors as well.

Thinking and memory skills were evaluated at the start as well as at three months and at the end of the six-month period.

Participants in the exercise group ramped up their activity during the first month. During the remainder of the study they trained at 75 percent of their maximum heart rate.

People in the stretching and toning group did exercises to promote flexibility and core strength.

Researchers measured participants’ aerobic capacity using a cycling machine called an ergometer that estimates exercise intensity. Participants also had MRI brain scans at the start and end.

This identified an increase in the thickness of the outer layer of the brain in the left frontal area in all the aerobics group – suggesting it contributes to brain fitness at all ages.

“Our research confirms that exercise can be beneficial to adults of any age,” said Prof Stern.

By Ben Gelblum and Mark Waghorn

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