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Fit Kids More Likely to Stay Mentally Sharp with Age: Study


June 27, 2022 – Physical activity helps kids build strong muscles and bones and lowers the risk of things like heart disease and diabetes later in life. Now, there’s yet another reason to encourage your child to move: It may help them stay mentally sharp for decades.

A new study done by researchers in Australia followed 1,200 people for 30 years and revealed a link between childhood fitness and mental performance in middle age.

The study began in 1985. It looked at people between the ages of 7 and 15 at the time, who were assessed for heart and lung fitness, power, and endurance, and measured for waist-to-hip ratio. More than 30 years later, those with the highest fitness scores and lower waist-to-hip ratios as kids tended to score better in tests of their thinking skills.

The results, published in the Journal of Science and Medicine in Sport, underline the importance of exercise not just for a healthy body but for a healthy brain. And to reap the full benefit, we may need to start as far back as early childhood.

Fit Body, Fit Brain

Previous research has linked adult fitness with better thinking skills and a lower risk of dementia later in life, though this study is the first to link childhood fitness to those outcomes.

That link remained even after controlling for things like academic performance, social and economic status, smoking, and alcohol consumption, says Michele Callisaya, PhD, a study co-author and associate professor from the National Centre for Healthy Ageing at Peninsula Health and Monash University in Melbourne, Australia. (Researchers from the University of Tasmania also worked on the study.)

High fitness levels help new neurons, connections, and blood vessels form in the brain, Callisaya says, which may explain the protective effect. What’s more, healthy behaviors may be more likely to stick if we start when we’re young, she says.

One surprising finding: While being fit as a kid was linked to higher scores in things like processing speed and attention, it had no impact on memory.

“This might be because the cognitive functions of processing speed and attention start to decline in midlife,” Callisaya says. “Memory generally starts to decline later.”

Tips for Parents

Children over 6 should get at least 60 minutes of moderate to vigorous activity every day, according to the U.S. physical activity guidelines. That’s in line with Australian guidelines as well, Callisaya notes.

“It’s important to remember this can be doing fun things like running around the park,” she says. “Making physical activity a positive experience and fun is important.”

And be sure you get in there and run around with them: Setting a good example is a key way to help prevent health problems, she says.

And here’s another strategy: Try cutting back on screen time. A separate study from Denmark suggests this may be a good way to get kids moving more. In fact, kids whose screen time was limited to 3 hours a week had an average of 45 minutes more daily physical activity than those not given a limit.

Surprisingly, screen limits had no impact on the physical activity of parents who also took part in the study, the researchers noted – maybe because children are more spontaneous in their physical activity, compared to adults.

In other words, persuading children to be more active could simply mean encouraging kids to be just that: kids.



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