Just work out, and your brain will become better! Two significant new studies on the impact of exercise on our minds both convey this message. In one, researchers examined the Genes, lives, and cognitive abilities of thousands of people to demonstrate that regular exercise results in significantly sharper thinking.
Another investigation sheds light on the benefits of exercise on the brain. A neurochemical thought to be necessary for lifelong brain health was discovered to be produced five times as much after just six minutes of vigorous exercise, according to research.
The discovery comes at a time when some recent, widely reported studies have cast doubt on the degree to which exercise improves thinking and memory. Yet the latest research, which examined data for over 350,000 individuals, provides the most compelling evidence yet that regular exercise can enhance cognition.
Exercise is “definitely” one of the best things you can do for your brain, according to Matthieu Boisgontier, an associate professor at the Université of Ottawa and the study’s principal investigator.
Miracle-Gro for the mind
The earliest signs that exercise changes the brain and memory appeared in rat research decades ago. In these studies, running rodents performed significantly better on mouse intelligence tests than sedentary mice, and their brain tissues teemed with heightened quantities of brain-derived neurotrophic factor (BDNF), also known as “Miracle-Gro” for the brain.
New brain cells and synapses are stimulated to form and develop as a result of BDNF. It increases brain size.
Although it’s more challenging to examine our brains to see if it rises there, studies in individuals have now proved that exercise also increases BDNF levels in our bloodstream. Meanwhile, numerous, extensive epidemiological studies have demonstrated a link between increased physical activity and enhanced memory and cognitive function as well as lowered risk for neurodegenerative diseases like Alzheimer’s.
However, questions have persisted regarding the true benefits of exercise for the brain.
While a comprehensive review of prior studies published in March noted that many human studies of exercise and cognition have been too small or otherwise limited to show convincing benefits for the brain, a study published last year of more than 500 older people found little cognitive benefit from 18 months of regular walking or other light exercises.
In contrast to a major review of prior studies published in March, which noted that many human studies of exercise and cognition have been too small or otherwise limited to show convincing benefits for brain health from working out, a study published last year of more than 500 older people found little cognitive benefit from 18 months of regular walking or other light exercises.
Rumblings about whether to keep advocating exercise as a strategy to preserve mental acuity with age have started in some scientific circles, according to Boisgontier. Yet we respond, ‘No, no. Go on. First, have a look at our findings,” he stated.
A landmark brain study
The study by Boisgontier and his colleagues, published last week in Scientific Reports, goes beyond conventional observational studies and conclusively proves that exercise does increase cognitive abilities.
They used genetic differences to classify and define people using Mendelian randomization, a technique that has lately gained popularity. Every one of us is born with or without specific DNA snippets, some of which are known to increase the likelihood that an individual will engage in physical activity. We are, in fact, genetically predisposed to be prone to movement from conception on. Similar roles are played in cognition by other gene fragments.
Researchers can determine how much exercise improves thinking abilities by comparing the cognitive scores of individuals who have or do not have exercise-promoting snippets with those of individuals who have cognition-related gene variations.
They extracted genetic data for about 350,000 individuals of all ages from two sizable databases of health-related data, coupled with objective assessments of physical activity for roughly 91,000 of them and cognitive scores for nearly 258,000. They discovered that people with a genetic propensity for exercise often exercised and performed better on thinking tests if their exercise was at least moderate, akin to jogging.
And, sure, even if you lack the gene sequences, exercise can still enhance your brain.
According to Boisgontier, the relationship between exercise and thinking was strong enough to prove causation, which means that in this extensive study, the appropriate kind of exercise led to mental acuity.
6 minutes of intense exercise raises BDNF
Although relatively small, the other recent study might contribute to the understanding of how exercise benefits brain function.
In this study, 12 healthy, young participants rode an exercise bike for 90 minutes at a fairly moderate pace, then underwent six minutes of intervals that included 40 seconds of intense pedalling and 20 seconds of rest. Researchers monitored the blood levels of BDNF in participants before, during, and after each session.
Previous research in mice indicates that this change in brain refuelling is what kick-starts the production of BDNF. Animals’ brains start producing more BDNF when they start consuming lactate instead of sugar, and the mice quickly develop into rodent brainiacs.
The researchers have now discovered signs that something similar is occurring in people. After around 30 minutes of easy riding, people’s blood lactate levels and BDNF levels both modestly increased. Nonetheless, lactate and BDNF levels increased throughout and after the six minutes of intense, rapid pedalling. (Another section of the study looked at the effects of a 20-hour fast, but it had no impact on BDNF.)
These findings imply that “exercising longer or particularly harder may optimise the advantages,” according to Travis Gibbons, a postdoctoral fellow at the University of British Columbia at Okanagan and the study’s lead author.
Aye, Boisgontier. He added that in his group’s study, both moderate and more-vigorous exercise — brisk walking and brisker running — improved cognition, likely because they caused a surge in BDNF. “Always, with exercise and the brain, it involves BDNF,” he said.
There are still many unanswered questions, according to Gibbons, such as the duration for which BDNF is elevated following exercise, the best types and amounts of exercise to increase BDNF, whether the effects are the same in older or less-healthy men and women, as well as the reason why fasting did not increase BDNF in this study. He and Boisgontier are conducting or planning additional research.
Yet for now, our research suggests that exercise, whether it is quick or slow, should consistently safeguard our capacity for thought.
