Walking more than 72 blocks did not appear to increase gray matter volume any further.
步行超过72街区的人们看来没有再增加脑灰质容量。
That may be why people with less gray matter volume in these areas are more sensitive to pain, and vice versa, the researchers said.
研究人员表示，这可能就是在上述脑区灰质较少的人对疼痛更为敏感的原因。
The significance of the relatively smaller gray matter volume and density seen in these players is not yet clear, the researchers say.
在这些运动员大脑中观察到的相对小的灰质面积和密度所代表的意义尚不清楚，研究者们说。
Studies in animals and people have shown that physical activity generally increases brain volume and can reduce the number and size of age-related holes in the brain's white and gray matter.
动物和人体研究都表明，一般而言，体育活动可以增加脑容量，并可减少与衰老有关的脑部白质和灰质孔洞的数量和大小。
At the same time, those whose physical activity increased over a five-year period — though these cases were few — showed notable increases in gray-matter volume in those same parts of their brains.
此外，在5年期间体育活动有所增加的老年人——尽管这样的例子并不多——脑部相同部位中的灰质量也显著增加了。
At the same time, those whose physical activity increased over a five-year period — though these cases were few — showed notable increases in gray-matter volume in those same parts of their brains.
此外，在5年期间体育活动有所增加的老年人——尽管这样的例子并不多——脑部相同部位中的灰质量也显著增加了。
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