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Does physical fitness improve spatial memory and increase brain structure size?

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Physical fitness improves spatial memory, increases size of brain structure, says a 2009 study, "Aerobic fitness is associated with hippocampal volume in elderly humans," published online, January 2, 2009, in the journal Hippocampus. Illinois psychology professor Art Kramer and his colleagues found that fitness increases hippocampus size and improves spatial memory in human subjects. Hippocampus size is vital to your memory. There's a strong correlation between fitness and hippocampus size.

When it comes to the hippocampus, a brain structure vital to certain types of memory, size matters. Numerous studies have shown that bigger is usually better. Now researchers have found that elderly adults who are more physically fit tend to have bigger hippocampi and better spatial memory than those who are less fit. The study shows that hippocampus size in physically fit adults accounts for about 40 percent of their advantage in spatial memory.

The hippocampus, a curved structure deep inside the medial temporal lobe of the brain, is essential to memory formation. Remove it – as was done in the well-known case of surgical patient Henry Gustav Molaison – and a person's ability to store most new experiences in memory is destroyed.

The hippocampus also is a key player in spatial navigation and other types of relational memory

Certain activities are believed to modify hippocampus size in humans. For example, a study of London taxi drivers found that the posterior portion of the hippocampus was larger in experienced taxi drivers than in other subjects.

And a study of German medical students found that the same region of the hippocampus increased in size as they studied for their final exams. Each person declines in cognitive ability with age, but at a different rate as the hippocampus shrinks. But exercise can affect the hippocampus size.

Studies also have found that the hippocampus shrinks with age, a process that coincides with small but significant cognitive declines

The rate at which this occurs, however, differs among individuals. Earlier studies found that exercise increases hippocampus size and spatial memory in rodents. But the 2009 study is the first to demonstrate that exercise can affect hippocampus size and memory in humans.

The researchers, from the University of Illinois at Urbana-Champaign and the University of Pittsburgh, measured the cardiorespiratory fitness of 165 adults (109 of them female) between 59 and 81 years of age. Using magnetic resonance imaging, the researchers conducted a volumetric analysis of the subjects' left and right hippocampi. They also tested the participants' spatial reasoning.

They found a significant association between an individual's fitness and his or her performance on certain spatial memory tests. There was also a strong correlation between fitness and hippocampus size.

"The higher fit people have a bigger hippocampus, and the people that have more tissue in the hippocampus have a better spatial memory," said U. of I. psychology professor Art Kramer, according to the February 24, 2009 news release, "Physical fitness improves spatial memory, increases size of brain structure."Kramer led the study with Pittsburgh psychology professor Kirk Erickson. Kramer is a full-time faculty member of the Beckman Institute for Advanced Science and Technology at Illinois. "Even ignoring the hippocampus data, we see there is this significant and substantial relationship between how fit you are and how good your memory is, or at least a certain kind of memory, a certain kind of memory that we need all the time," Kramer said, according to the news release.

"This is really a clinically significant finding because it supports the notion that your lifestyle choices and behaviors may influence brain shrinkage in old age," Erickson said, according to the news release. "Basically, if you stay fit, you retain key regions of your brain involved in learning and memory." An impairment of spatial memory "is one of a number of reasons why older people end up losing their independence," Kramer said, according to the news release. "Here is yet more evidence that becoming fit has implications for how well you're going to live your life." You also may wish to see another work of research, "The human hippocampus at 7 Tβ€”In vivo MRI."

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