too bad, you are brainless old man.
--- In proletar@yahoogroups.com, "Jusfiq" <kesayangan.allah@...> wrote: > > > Ayuh, ikut jogging. > > --- > > guardian.co.uk home > > Start running and watch your brain grow, say scientists > > Aerobic exercise triggers new cell growth study > Region of brain affected linked to recollection > > * Ian Sample, science correspondent > * guardian.co.uk, Monday 18 January 2010 20.41 GMT > * larger | smaller > * Article history > > The health benefits of a regular run have long been known, but scientists have > never understood the curious ability of exercise to boost brain power. > > Now researchers think they have the answer. Neuroscientists at Cambridge > University have shown that running stimulates the brain to grow fresh grey > matter and it has a big impact on mental ability. > > A few days of running led to the growth of hundreds of thousands of new brain > cells that improved the ability to recall memories without confusing them, a > skill that is crucial for learning and other cognitive tasks, researchers > said. > > The new brain cells appeared in a region that is linked to the formation and > recollection of memories. The work reveals why jogging and other aerobic > exercise can improve memory and learning, and potentially slow down the > deterioration of mental ability that happens with old age. > > "We know exercise can be good for healthy brain function, but this work > provides > us with a mechanism for the effect," said Timothy Bussey, a behavioural > neuroscientist at Cambridge and a senior author on the study. The research > builds on a growing body of work that suggests exercise plays a vital role in > keeping the brain healthy by encouraging the growth of fresh brain cells. > > Previous studies have shown that "neurogenesis" is limited in people with > depression, but that their symptoms can improve if they exercise regularly. > Some > antidepressant drugs work by encouraging the growth of new brain cells. > > Scientists are unsure why exercise triggers the growth of grey matter, but it > may be linked to increased blood flow or higher levels of hormones that are > released while exercising. Exercise might also reduce stress, which inhibits > new > brain cells through a hormone called cortisol. > > The Cambridge researchers joined forces with colleagues at the US National > Institute on Ageing in Maryland to investigate the effect of running. > > They studied two groups of mice, one of which had unlimited access to a > running > wheel throughout. The other mice formed a control group. In a brief training > session, the mice were put in front of a computer screen that displayed two > identical squares side by side. If they nudged the one on the left with their > nose they received a sugar pellet reward. If they nudged the one on the right, > they got nothing. > > After training the mice went on to do the memory test. The more they nudged > the > correct square, the better they scored. At the start of the test, the squares > were 30cm apart, but got closer and closer together until they were almost > touching. This part of the experiment was designed to test how good the mice > were at separating two very similar memories. The human equivalent could be > remembering what a person had for dinner yesterday and the day before, or > where > they parked on different trips to the supermarket. > > The running mice clocked up an average of 15 miles (24km) a day. Their scores > in > the memory test were nearly twice as high as those of the control group. The > greatest improvement was seen in the later stages of the experiment, when the > two squares were so close they nearly touched, according to a report in the > Proceedings of the National Academy of Sciences. > > "At this stage of the experiment, the two memories the mice are forming of the > squares are very similar. It is when they have to distinguish between the two > that these new brain cells really make a difference," Bussey said. > > The sedentary mice got steadily worse at the test because their memories > became > too similar to separate. > > The scientists also tried to wrongfoot the mice by switching the square that > produced a food reward. The running mice were quicker to catch on when > scientists changed them around. > > Brain tissue taken from the rodents showed that the running mice had grown > fresh > grey matter during the experiment. Tissue samples from the dentate gyrus part > of > the brain revealed on average 6,000 new brain cells in every cubic millimetre. > The dentate gyrus is part of the hippocampus, one of the few regions of the > adult brain that can grow fresh brain cells. > Running stories > > "Running! If there's any activity happier, more exhilarating, more nourishing > to > the imagination, I can't think of what it might be. In running the mind flees > with the body, the mysterious efflorescence of language seems to pulse in the > brain, in rhythm with our feet and the swinging of our arms." > > Joyce Carole Oates, American author and professor of creative writing at > Princeton University: > > "When I am running my mind empties itself. Everything I think while running is > subordinate to the process. The thoughts that impose themselves on me while > running are like light gusts of wind they appear all of a sudden, disappear > again and change nothing." > > Haruki Murakami, Japanese author > > "When I run, I think about everything: physics, family problems, plans for the > weekend. I haven't made any big discoveries on a run, but it does give me time > to think through problems. Some solutions are obvious, but they are only > obvious > when you are relaxed enough to find them." > > Wolfgang Ketterle, Nobel prizewinning physicist, MIT > > "Being a runner, to me, has made being depressed impossible. If ever I'm going > through something emotional and just go outside for a run, you can rest > assured > that I'll come back with clarity and empowerment." > > Alanis Morissette, singer-songwriter > ------------------------------------ Post message: prole...@egroups.com Subscribe : proletar-subscr...@egroups.com Unsubscribe : proletar-unsubscr...@egroups.com List owner : proletar-ow...@egroups.com Homepage : http://proletar.8m.com/Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/proletar/ <*> Your email settings: Individual Email | Traditional <*> To change settings online go to: http://groups.yahoo.com/group/proletar/join (Yahoo! ID required) <*> To change settings via email: proletar-dig...@yahoogroups.com proletar-fullfeatu...@yahoogroups.com <*> To unsubscribe from this group, send an email to: proletar-unsubscr...@yahoogroups.com <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
