Short and intense exercise better, says research

Dr David Moreau from the University of Auckland School of Psychology. Image: Supplied.

According to new research from the University of Auckland, short intensive bouts of exercise have similar beneficial effects on the brain as longer workouts.

Dr David Moreau from the Universitys School of Psychology carried out a meta-analysis of 28 national and international studies involving more than 1000 people, looking at the effect exercise has on brain functioning including our ability to plan, focus attention, remember instructions and juggle multiple tasks.

“While the idea of exercising intensely for short periods has gained a lot of traction in recent years, the link between a shorter bout of exercise and things like our ability to pay attention or memorise things has never been well understood,” David says.

“Our analysis over all these studies has found that high-intensity exercise does provide improvement to brain function in a similar way to longer periods of exercise.”

The study shows that beyond well-known effects on general fitness levels, including cardiovascular health, high intensity exercise can also be the key to healthier brains and minds.

The research found the benefits of short bursts of exercise were small but significant and consistent across age groups, gender and fitness levels. Generally beneficial effects lasted up to around 10 minutes after exercise although effects lasted slightly longer in some studies.

Shorter exercise periods ranged from one minute to around 20 minutes. Low-intensity exercise included walking, cycling at a relatively slow pace and jogging. These were the most common forms of exercise measured across studies.

Higher intensity exercise is generally regarded as exercise that is two-thirds of your maximum heart rate, while low exercise is that which can be carried out comfortably for a longer period of time, typically for more than 30 minutes.

The findings are particularly relevant for schools and workplaces or anyone forced to be sedentary for a large part of the day, David says.

“One of the biggest barriers to exercise is that we don’t have the time, or we tell ourselves we don’t have the time, but this study shows all you need is a few minutes, perhaps repeated a few times a week.”




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