How Exercise Can Make Your Brain Work Better

Training for endurance might just come with a pretty fantastic bonus.

By Jordan Smith


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  • A recent study published in Nature looked at fitness levels in young people and compared that to their brain function.
  • Researchers found that the higher their endurance, the better their brain worked.
  • Fitter individuals scored higher on the cognitive tests and also had higher levels of white matter in the brain—which is your brain’s connection system, responsible for transmission of nerve signals.

You know exercising is smart. But might your workout actually be making you smarter?

In a study published in Nature, a group of over 1,100 people with an average age of about 28 participated in physical and mental tests. In the physical tests, participants walked as fast as they could for two minutes; their distance was measured as a proxy of their endurance. Those who went farthest in the two-minute test scored highest for endurance.

In the mental tests, researchers gauged things like memory, reasoning, and judgement. They also used MRI tests to look at brain function.

The tests revealed the fittest people—those with higher levels of endurance—scored better on the cognitive tests and higher levels of something called fractional anisotropy, which resembles white matter in the brain. White matter is your brain’s communication system—think wires that connect brain parts with each other to share messages, as Jonathan Repple Ph.D., of the department of psychiatry and psychotherapy at the University of Muenster Hospital in Muenster, Germany, explained to Runner’s World. If you have high levels of intact white matter, it means your wiring is solid—your brain is well-connected and brain cells can quickly communicate.

Those with higher endurance also had higher global cognition scores, which measure things like sorting, memory, and recognition to give a view on overall cognitive performance.

 “Better fitness causes better blood supply to the brain, causes an increase in nerve-stimulating hormones, and causes decreases in inflammation, which could lead to better ‘insulation’ of the white matter ‘wires,’” Repple said.

And while more research is needed to prove cause and effect—say, that it’s not that better brain health that leads to better endurance—it seems that your workout can boost both body and mind.

From: Runner's World US




Is MX Physically Demanding?

Are motocross riders the fittest athletes in the world?

Competitors in many sports like to think that their sport is the hardest to do, the most physically demanding. There are many lists of the fittest sports, with boxing and gymnastics commonly on top. See our discussion about the Fittest Sports for details. Motocross riders are rarely considered, but should be.

Ever since motocross failed to be listed on the ESPN List of The Most Demanding Sports, there has been great discussion on this site about the physical demands of motocross riding. There is no doubt that it is a tough sport. As well as a lot of anecdotal evidence of how demanding the sport is, many have pointed out that there have been a couple of scientific studies that have supported their assertions.

Motocross Demands

Motocross is a very physically and mentally challenging off-road motorcycle sport, which is raced on natural terrain with man-made obstacles. While undoubtedly the bike does a lot of the work for the rider, to manoeuvre and stay on the 200+ lb machine requires a high level of strength, power and endurance. The riders need to be light and strong, with good strength of the upper body, shoulder and arms, hand grip and legs. A study by Gay et al. found that during a motocross race heart rate is quickly raised, and the competitors average heart rate was between 92-96% of their maximum, indicating that there are very high demands on the aerobic endurance system. See more about fitness for motorsports.



Motocross bike on a dirt track

The Fittest Sport?

Motocross is definitely physically tough, though is it the most demanding of all sports? It is not an easy thing to measure and compare the fitness of athletes from different sports. You can compare fitness test scores of athletes, but there are issues of varying protocols and athlete levels, and there is not a lot of data on motocross riders for comparison. It is best to compare head to head battles. There are two oft reported studies which have directly compared motocross riders to other athletes, one in 1979 by the National National Athletic Institute and another in 2002 by the University of Pittsburgh Medical Center's (UMPC) Sports Performance Complex.

1979 study by the National Athletic Health Institute (NAHI)

A study was conducted in 1979 at the National Athletic Health Institute in Inglewood, California, founded by pioneer sports orthopedists Drs. Robert Kerlan and Frank Jobe. The original article apparently appeared in a Cycle magazine in early 1980, though this article or any research paper has not been sighted. The information below has been gained from various online reports.

The study compared athletes from a range of sports, including motocross (MX) racers. Other sports tested were American football, gymnastics, wrestling, basketball, soccer, baseball, wrestling, ice skating, track and field, marathon runners and maybe others. The motocross racers included Brad Lackey, Mike Bell, Danny Laporte, Jeff Ward, Kent Howerton plus several others. There was a large range of fitness tests conducted, including a treadmill VO2maxtest, body fat levels using underwater weighing, bench press for upper body strength and leg press for lower body strength.

One report stated the highest scoring sports were found to be long-distance running, gymnastics, wrestling and motocross racing, while another said soccer was top over motocross.

2002 by the University of Pittsburgh Medical Center

A study was conducted in 2002 at the University of Pittsburgh Medical Center's (UMPC) Sports Performance Complex, headed by Alan DeGennaro, the director of UPMC's Sports Performance Program and Brian Hagen, director for rehabilitation medicine at the sports complex. The testing began when the nation's best motocross racers traveled to Pittsburgh for the Steel City Nationals (Round 12 of the U.S. Motocross championships) in Delmont Labor Day weekend in 2002. A battery of tests was performed on about a dozen riders, including Broc Glover and Hannah.

The evaluations included some standard medical checks such as EKGs, blood samples, blood pressure, and more sport specific treadmill maximal oxygen consumption test, body fat levels using underwater weighing and skinfold measures, blood lactate acid buildup, upper body strength via a series of shoulder presses, bench presses and curls, lower body strength strength of quadriceps and hamstring muscles, grip strength, sit-ups, flexibility, and vertical jump power. These results were then compared to published results for other sports. No details of the conclusions of this testing have been found.


Without the specific details of the results of these studies, no conclusions about the claim of motocross riders being the fittest can be made. The lack of published physiological data of riders highlights the need for further study. The data so far indicates that the sport of motocross should be considered in all the discussions about the fittest sports, though there are several other sports worthy of the claim to be the world's fittest sport!


  • "UPMC starts study of ways to cut down off-road motocross injuries", By Pohla Smith. Published Tuesday, July 23, 2002, Pittsburgh Post-Gazette,
  • "Are motocross riders athletes? Bikers and researchers say yes", Pocono Record, Aug 30, 2002.
  • "Motocrossers As Athletes", p106, Cycle World Magazine Jan-Feb 1981.
  • Transcript of interview of Brad Lackey by Bobby Myers about his participation in the 1979 NAHI study.
  • "The Exercise Intensity of MX and SX Racing", By Gay, D; Keen, J; Riel, R; Evans, M; Milek ,M; Furman, T; Casillas, E; Augustine, S (senior author) University of Florida HSC - Jacksonville and Jacksonville Orthopedic Institute. link

Other Studies

  • "Physiological characteristics of top level off-road motorcyclists". Gobbi AW, Francisco RA, Tuy B and Kvitne RS. BJSM. 2005; 39:927-931. - comparing off-road motocross, enduro, and desert rally motorcyclists. Motocross riders had more muscle mass, more strength, and greater aerobic power. link
  • "Cardio-respiratory and neuromuscular responses to motocross race", Department of Biology of Physical Activity. University of Jyväskylä. by Tomi Konttinen. 2005. link
  • "Cardiopulmonary loading in motocross riding Tomi Konttinen", Keijo Häkkinen, and Heikki Kyröläinen, Journal Of Sports Sciences Vol. 25 , Iss. 9,2007
  • Saltin, B. 1975. Motocross-ajajan maksimaalinen hapenottokyky ja syketaajuus ajosuorituksen aikana (Motocross rider's maximal oxygen uptake and heart rate during the riding performance). Teoksessa: Husqvarna 250-360 CR. Owner's manual. American edition. Värnamo. Sweden. 1976
  • "Anthropometric Characteristics and Performance Capabilities of Highly Trained Motocross Athletes Compared With Physically Active Men", Bach, Christopher W.; Brown, Ann F.; Kinsey, Amber W.; Ormsbee, Michael J. Journal of Strength and Conditioning Research December 2015 Vol. 29 - Issue 12: p 3392–3398. - results suggest highly trained MX athletes possess certain physiological adaptations that likely result from sport-specific demands compared with physically trained men.


Here are a few more mentions of other studies that I have found online, but were unable to find any more evidence. Let me know if you have details to add or can verify the details below.

  • "extensive tests were done by the Swedish Physiological Institution way back in the mid-1960's. The researchers names were Bengt Saltin and Goran Agnevik."
  • "In the late 60's early 70's some Swedish Sports scientist (maybe from Husqvana) did a study which found MX to be the most physically demanding sport in the world ... Professional Tennis came in second. "
  • "In the 90's German scientists compared many top German sports people and Pit Beirer came out as fittest of them all."

Endurance Exercise May Be a Speed Bump That Slows Down Alzheimer’s


It’s never too late to start healthy habits that can reduce your risk.

By Elizabeth Millard

Oct 4, 2019